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#1 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Sep 2004
Location: Maryland
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Guide to the 7v Fan Mod
Many people, while desiring high performance out of their computers, decide that their computer is too loud, so the easiest way to combat this problem is to slow down the fans, which are the major noisemaker in the average computer. To slow a fan down, one must reduce the voltage powering it. The fans that most of us use in our computers are 12vdc fans, but most will run fine at lower voltages, with some going all the way down to 4v without issue. The cheapest and easiest way to slow down a fan is to simply power the fan off a different rail than normal. Now, most people know that the average computer has a +/-12, +/-5, and 3.3v rail, and it is simple to power fans off of these rails by changing the power lead for the fan from the normal 12v to the 5v rail, as most fans won't start with 3.3v. While these rails are common knowledge, many people don't know that there are also several "virtual rails", the 8.7v, 7v, and 17v, as well as the 24v and 15.3v rails. These rails are not true voltage rails, they are accessed by using one of the real voltage rails instead of the common ground as a ground for that rail, so the 12v=12vrail+ground, 5v=5vrail+ground, and 3.3v=3.3vrail+ground. Now, if you switch the ground to one of the lesser voltage rails, such as the 12vrail+5vrail, you end up providing 7v, which is the popular 7v fan mod. This is by far the most common, because the 4-pin molex connectors used to power devices such as hard disk drives and DVD ROM drives has a 5v line, 2 grounds, and a 12v line. To get 8.7v, it is necessary to bring a wire from the 20 pin ATX connector on the mobo, which is much less convenient. The voltages above 12v simply use the negative rails, but again, these are only found on the 20 pin ATX connector, and are not really very safe to use for this purpose, as the negative rails are very weak, and don't have enough load to absorb the power sent back up the rail. This is also an issue with the 7v and 8.7v mods, but much less so because of the load of the whole computer that is much greater than the load of the fans, but before doing this mod, always check. It is not a good idea to try this mod when starting a PSU with the wire trick, because unless you are running other things with it, there is no load, and you can cause physical damage to your hardware. Some of the lower quality PSUs also die with this mod, so it is only advisable to do it with a decent PSU. 12v to the fans: ![]() 7v to the fans: ![]() 5v to the fans: ![]()
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Processor: Athlon XP-M 2600 IQYHA 0401 Motherboard: DFI NF2 Ultra Infinity vcore, vdroop, OCP, vdimm, vdd mods Cooling: Swiftech MCW6002a-Swiftech MCP350-Weapon Modded 2-302 headercore+Shroud Memory: 2x512 Kingston HyperX KHX3200 BH-5 2-2-2-11 Power Supply: OCZ Powerstream 520 Sound Card: EMU 1212m Headphone Amp: DIY Pimeta/Mint/CMoy Headphones: Senn HD580/Shure E4c/Sony MDR-D66 Eggos/Koss ksc75 Video Card: Radeon 9600 Pro @ 489 Core/680 Mem fdd power mod, vmem, vgpu Last edited by cetoole; 03-14-05 at 07:35 PM. |
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#2 |
![]() ![]() ![]() ![]() Member Join Date: May 2003
Location: UK - Midlands
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__________________
HARDWARE:| E8600@5ghz 1.52v | 2x8800GTX SLI | 4gb OCZ Flex 1000mhz 4-4-4-12 | 3x74gb Raptors Raid0 | CPU COOLING:| SS Chilly1 Evap 270w | WATERCOOLING:| Iwaki MDZ30 Pump | EK-VGA Blocks | MIPS - Northbridge, Southbridge & Mosfett Blocks | 100M copper tubing buried under drive | POWER: | Enermax Galaxy 1kw DISPLAYS: | Dell 3007WFP 30" | Acer AL1916WA 19" GAMER TAG:| =UKAW=Bobtod | |
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#3 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Jul 2003
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Excellent guide Thanks |
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#4 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Dec 2004
Location: Philadelphia
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HERE is an easier guide. ![]()
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I always tell the truth even when I lie. - scarface I know it sounds like I'm in denial, but I'm not. - unknown |
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#5 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: May 2004
Location: Philly, PA
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Great guide! Gonna save me from searching the forums later! Going to be doing 7v mod when i get home.But what about the fans w/3 pin connectors? Are they moddable? Or is it for only 4 pin molex connectors?
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Finally Finished! Intel Q9550 @ 4.05ghz - Scythe Ninja - Asus P5E Deluxe x48 - ATI HD4850 512mb Silverstone Temjim 6 - OCZ StealthXtreme 600w PSU - 2x2gb Kingston Hyperx 1066 DDR2 WD 320gb 16mb Cache - Samsung 22x DVD-RW - Logitech G11 - MS Sidewinder Laser Gaming Mouse Displays ASUS VW224U LCD Sanyo 46" 1080p LCD TV Retired 3dmark Captain Heatware 108-0-0 |
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#6 |
![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Aug 2002
Location: USA
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Good guide ![]()
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My systems: Intel Core 2 Duo e6420 topped by Thermalright Ultra-120, 2GB Transcend DDR800, 320GB Seagate Barracuda SATA II 16MB cache HD, 250GB WD IDE HD, 200GB Maxtor IDE HD, Lian-Li PC-7B case, EVGA nVidia GeForce 8800GTS 320MB AMD Athlon XP 2500+ @2200mHz, 1024 MB PC3200 RAM, 80GB Maxtor HD, 20GB Western Digital HD, AGP nVidia 6600GT, MSI K7N2 Delta, Custom Modded Case FOLD for Team 32! |
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#7 | |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Sep 2004
Location: Maryland
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Quote:
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Processor: Athlon XP-M 2600 IQYHA 0401 Motherboard: DFI NF2 Ultra Infinity vcore, vdroop, OCP, vdimm, vdd mods Cooling: Swiftech MCW6002a-Swiftech MCP350-Weapon Modded 2-302 headercore+Shroud Memory: 2x512 Kingston HyperX KHX3200 BH-5 2-2-2-11 Power Supply: OCZ Powerstream 520 Sound Card: EMU 1212m Headphone Amp: DIY Pimeta/Mint/CMoy Headphones: Senn HD580/Shure E4c/Sony MDR-D66 Eggos/Koss ksc75 Video Card: Radeon 9600 Pro @ 489 Core/680 Mem fdd power mod, vmem, vgpu |
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#8 |
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New Member Join Date: Dec 2004
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noted. |
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#9 |
![]() ![]() ![]() ![]() Member Join Date: May 2004
Location: Nottingham/London, UK
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I am really struggling with this mod. The main sticking point is that i can for the life of me remove the molex pins enabling me to do the actual mod ![]() What is the best way, i've tried using a biro, but that isnt working....whot should i be "aiming" for - i see the little barbs but cant get to them/make them budge. Any help? D.L ![]() |
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#10 | |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Sep 2004
Location: Maryland
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Quote:
__________________
Processor: Athlon XP-M 2600 IQYHA 0401 Motherboard: DFI NF2 Ultra Infinity vcore, vdroop, OCP, vdimm, vdd mods Cooling: Swiftech MCW6002a-Swiftech MCP350-Weapon Modded 2-302 headercore+Shroud Memory: 2x512 Kingston HyperX KHX3200 BH-5 2-2-2-11 Power Supply: OCZ Powerstream 520 Sound Card: EMU 1212m Headphone Amp: DIY Pimeta/Mint/CMoy Headphones: Senn HD580/Shure E4c/Sony MDR-D66 Eggos/Koss ksc75 Video Card: Radeon 9600 Pro @ 489 Core/680 Mem fdd power mod, vmem, vgpu |
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#11 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Nov 2003
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biro is a pen. you have to find one that is big enough to get all the way over the pin, but is snug enough on the pin it will squeeze the tabs in. it took some rummaging in my desk drawer, but i eventually found one that worked perfectly. |
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#12 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Jul 2003
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how do you keep the wire to stick in permanently? the wire seems to slip out kindda easy.
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GA-S3 + E6600 @ 360 X 9 1.4V 2 X 1GB G.Skill PC6400 @ 360 4-4-4-12 2 X 320GB Seagate 2 X 250GB Maxtor 1 X 160GB Seagate 1 X Samsung 18X DVDRW w/Lightscribe Creative Audigy 4 Pro 7600GS @ 550/420 TT Big Typhoon |
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#13 | |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Sep 2004
Location: Maryland
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Quote:
__________________
Processor: Athlon XP-M 2600 IQYHA 0401 Motherboard: DFI NF2 Ultra Infinity vcore, vdroop, OCP, vdimm, vdd mods Cooling: Swiftech MCW6002a-Swiftech MCP350-Weapon Modded 2-302 headercore+Shroud Memory: 2x512 Kingston HyperX KHX3200 BH-5 2-2-2-11 Power Supply: OCZ Powerstream 520 Sound Card: EMU 1212m Headphone Amp: DIY Pimeta/Mint/CMoy Headphones: Senn HD580/Shure E4c/Sony MDR-D66 Eggos/Koss ksc75 Video Card: Radeon 9600 Pro @ 489 Core/680 Mem fdd power mod, vmem, vgpu |
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#14 | |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Jul 2003
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Quote:
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GA-S3 + E6600 @ 360 X 9 1.4V 2 X 1GB G.Skill PC6400 @ 360 4-4-4-12 2 X 320GB Seagate 2 X 250GB Maxtor 1 X 160GB Seagate 1 X Samsung 18X DVDRW w/Lightscribe Creative Audigy 4 Pro 7600GS @ 550/420 TT Big Typhoon |
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#15 |
![]() ![]() ![]() Member Join Date: Aug 2004
Location: South Elmsall, West Yorkshire, Uk, Nr Earth
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Cheers for this i already know how to do the mod but i've right clicked and saved the pics for future reference because my brain sometimes packs up on me and i forget alot! Thanks again, great guide!
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Empty your mind. Be formless, shapeless, like water. Now you put water into a cup, it becomes the cup. You put water into a bottle, it becomes the bottle. You put it into a teapot, it becomes the teapot. Now, water can flow, or it can crash! Be water, my friend. (Bruce Lee) Last edited by T1Cybernetic; 01-12-07 at 07:58 AM. |
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#16 |
![]() ![]() ![]() ![]() Member Join Date: Jul 2003
Location: Ottawa, Canada
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which is the best voltage to connect the fans on ? 5V? 7V? 12V? also, which give the most performance/results ? Thanks. I have no ideas on these
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:: My Heatware :: |
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#17 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Dec 2004
Location: Waltham, MA, USA
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higher voltage = faster... so 12v is faster and more airflow, but may be to loud on some fans. That is why people 5v and 7v their fans... the standard 3-pin fan connector is a 12v connector
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When I logon to Windows, I press Ctrl+Alt+ELITE E7200 Wolfie-3M 2533Mhz @ 3800MHz 400x9.5~Asus P5B Deluxe/Wifi-AP~Voltmodded EVGA 7900GS KO @ 700/975 ~1GB Corsair Dominator PC2-8500 @ 500MHz 5-5-5-15~BFG ES-800 PSU Custom Watercooling Loop | selling a Maze4 GPU | Apogee GT, MCW60, 1/2" Modded DDC-1VC, Thermochill PA120.2 w/ 2 Yate Loon D12SL-12s pull, 7/16"x5/8" MasterKleer, 100% Distilled Water with Iodine ---All encased in a Silverstone TJ-06
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#18 |
![]() ![]() ![]() ![]() Member Join Date: Jul 2003
Location: Ottawa, Canada
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:: My Heatware :: |
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#19 | |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Sep 2004
Location: Maryland
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Quote:
__________________
Processor: Athlon XP-M 2600 IQYHA 0401 Motherboard: DFI NF2 Ultra Infinity vcore, vdroop, OCP, vdimm, vdd mods Cooling: Swiftech MCW6002a-Swiftech MCP350-Weapon Modded 2-302 headercore+Shroud Memory: 2x512 Kingston HyperX KHX3200 BH-5 2-2-2-11 Power Supply: OCZ Powerstream 520 Sound Card: EMU 1212m Headphone Amp: DIY Pimeta/Mint/CMoy Headphones: Senn HD580/Shure E4c/Sony MDR-D66 Eggos/Koss ksc75 Video Card: Radeon 9600 Pro @ 489 Core/680 Mem fdd power mod, vmem, vgpu |
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#20 |
![]() ![]() ![]() ![]() Member Join Date: Jul 2003
Location: Ottawa, Canada
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I want to ask a question: Example: YS Tech 120mm fan with a specs for 12V as: 4200 RPM , 131 CFM , 45db When you volt mod it, everything should be lower by 7/12 ?? ( 76CFM, 27db, 2450 RPM )??? Is it how it work ? If the fan has 3 pin , how could I change to 7V and where do I plug into ? Do I plug into the regular 12V power molex from the power supply ? Many thanks
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:: My Heatware :: |
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#21 | |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Sep 2004
Location: Maryland
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Quote:
__________________
Processor: Athlon XP-M 2600 IQYHA 0401 Motherboard: DFI NF2 Ultra Infinity vcore, vdroop, OCP, vdimm, vdd mods Cooling: Swiftech MCW6002a-Swiftech MCP350-Weapon Modded 2-302 headercore+Shroud Memory: 2x512 Kingston HyperX KHX3200 BH-5 2-2-2-11 Power Supply: OCZ Powerstream 520 Sound Card: EMU 1212m Headphone Amp: DIY Pimeta/Mint/CMoy Headphones: Senn HD580/Shure E4c/Sony MDR-D66 Eggos/Koss ksc75 Video Card: Radeon 9600 Pro @ 489 Core/680 Mem fdd power mod, vmem, vgpu |
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#22 |
![]() ![]() ![]() ![]() Member Join Date: Jul 2003
Location: Ottawa, Canada
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I just modded my YS Tech 120mm to 7V Voila, very quiet, push air pretty good I wish that if it could pust out 7/12 of its total CFM, it would be like 76. It is so quiet now.
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:: My Heatware :: |
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#23 |
![]() Registered Join Date: May 2005
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I have 3 x 50mm fans in my case. Will I need a seperate power supply for each or can I use one conector (7v mod) split into tree sets of wires powering each. |
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#24 |
![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: May 2005
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goood guide |
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#25 |
![]() ![]() Registered Join Date: Jun 2005
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sweet guide did this on my desktop....i dont think u can do it but can this be done with laptop fans...like running them at 7v
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Dell Inspiron 6000 Windows XP Pro Intel Sonoma 1.6 GHz Pentium M 1.25 GB RAM 40GB 5400 RPM HD ATI Radeon x300 128mb...417/300 3dMark05...1761 PCmark05...2365 SONY DVD-RW DL Video IPOD 30GB TO COME 1.7 ghz pin modded to 2.26 GHz |
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#26 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Sep 2004
Location: Maryland
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I dont see a reason it wouldnt work with laptops, expect that possibly there isnt an easily accessable +5v rail to use. I would not suggest doing it either, most laptops dont have much in the way of spare cooling available, reduce the already limited fans, and something might burn. They also dont tend to have as much drawing current as a desktop to be able to handle the mod safely, so if you must slow down you laptop fans, I would do it via resistors or voltage regulation, an easy method would be something like a 78xx fixed voltage regulator, where the "xx" is the voltage (eg. 7805=+5v regulated output).
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Processor: Athlon XP-M 2600 IQYHA 0401 Motherboard: DFI NF2 Ultra Infinity vcore, vdroop, OCP, vdimm, vdd mods Cooling: Swiftech MCW6002a-Swiftech MCP350-Weapon Modded 2-302 headercore+Shroud Memory: 2x512 Kingston HyperX KHX3200 BH-5 2-2-2-11 Power Supply: OCZ Powerstream 520 Sound Card: EMU 1212m Headphone Amp: DIY Pimeta/Mint/CMoy Headphones: Senn HD580/Shure E4c/Sony MDR-D66 Eggos/Koss ksc75 Video Card: Radeon 9600 Pro @ 489 Core/680 Mem fdd power mod, vmem, vgpu |
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#27 | ||
![]() Registered Join Date: May 2005
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Quote:
On some laptops (dells especially) you can control the fan speeds through software. Quote:
http://www.streamload.com/nissmo300/site/volts.htm They're easy to insert and stay on pretty tight but are a little harder to take out. The advantage of doing this over using a 4 pin adapter is that you can still use the rpm monitor pin in the 3 pin connector by inserting it to the motherboard. Last edited by mich43L; 11-02-05 at 10:09 AM. |
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#28 |
![]() ![]() ![]() ![]() Member Join Date: Jun 2005
Location: Long Island, NY
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tried the 7v mod with an old fan and an at power supply and it didnt work O.o why not . it worked with 12v and with 5v i tried it both ways
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Q8200 @ 3.2ghz // Xigmatek Dark Night P5Q SE/R 8gb Ballistix DDR2 800mhz @ 460mhz 8800GT // Accelero S1 |
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#29 |
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New Member Join Date: Dec 2005
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When I use this mod with my tornado, it won't read the RPM when it's at 7v. 12v and 5v work fine, but for some reason it's only at 7v that it won't read the RPM. 5v gives me around the same performance as the fan I was already using, and 12v gives me much better cooling(only it's too loud). So I'm interested in seeing the results for 7v only it won't work. Any ideas? |
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#30 |
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Member Join Date: Jan 2003
Location: I can see walmart, 44906
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the fan's RPM sensor wire works by pulsing ground twice every revolution, so the sensor on th motherboard is looking for a logic low (0V, ground) but instead of pulling low, the fan is pulsing that line with +5V, which is definately logic high, which is what the sensor is already at, so it wont read RPMs. it could actually cause damage to the boards sensor, i would leave it unhooked. im sure it wouldnt be too terribly difficuly to build a simple circuit to give the mobo the ground it's looking for, basically just a transistor to connect the ground to the rpm header when the fan pulses it's 5 V (or 3.3 if using that rail) hope this helps some. only way to find out what rpms it runs at with a given voltage is to use a rheostat or other fan controlling device that actually reduces the voltage and use a multimeter to get it set to the appropriate voltage and then check with the mobo tool.
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pc: dell P4 1.8 with 512 megs of PC133, not even an AGP slot in it. 32 meg TNT2 pwnin it up. ride: 82 k10, 31's on 3 inch susp. lift, SBC 400, TH350, NP208, 3.09 gears. quadrajet to an edelbrock intake, 0.030" milled off the heads, headers to glasspackeds, its loud and gets <10 MPG. take that, Gore. |
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| Tags |
| fan mod, voltage mod |
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