question about vdimm mod for nf7-s

[jlin453]

on this link, has anyone performed method 3's vdimm mod? What exactly does "vdimm = i/o volt" mean? This method seems easier than trying to solder a 1k resister). Has anyone done it this way?

http://s6.invisionfree.com/underclock/index.php?showtopic=57


looking at this picture, does it just make the vdimm voltage 3.3v?
http://downloads.modlabs.net/bios/pic/abits.jpg

[Sentential]

Im also very interested to hear.... I might do this vmod.

[jlin453]

I guess after connecting those two points you'd have to insulate the wire so it doesn't contact the case oncey ou screw in the motherboard?

[Sentential]

Looks ALOT easier than any mod Ive seen.... If it works count me in!

[Hell-Fire -XS-]

Keep in mind that with that mod you are sending directly to the ddr whatever voltage you have the 3.3v power rail of the psu set to.

If you have a modded psu that is giving 3.65v, then your ddr is also getting 3.65v. If you psu is stock and giving between 3.25-3.45v, then you ddr will be getting that.

[Sentential]

My PSU is giving out 3.25v (which is what Im looking for)

If thats what she gives....perfect.

But does the mod work?

[jlin453]

Yeah mine's putting out 3.25V also. I bought my soldering iron today and am ready to go. Maybe I'll PM tictac and ask him for more details.

[Hell-Fire -XS-]

PM tictac since he is working hand in hand with this stuff at the moment.

I can see no reason why this wouldnt work.

[jlin453]

Yeah, I PMed both tictac and dirty punk. I'm waiting anxiously..soldering iron in hand ready :)

[jlin453]

tictac's response:

we have tested it... safe
vdimm = v i/o voltage


Looks like I'll be busy tomorrow afternoon ;)








(btw, what does sense wire mean?)

[Sentential]

I hate to ask this... but can you show the pics of how you did it / how it goes:-/?

Ill do mine this weekend. I dont have my stuff yet. If urs goes well I'll do mine as well

[jlin453]

tictac directed me to this thread:
http://forum.lowyat.net/index.php?showtopic=40982&st=135

Lots of reading to do before I do the mod.

And yeah, when I do it I'll post pictures.

[Hell-Fire -XS-]

Its not a tough mod at all.

Just be aware that whatever your psu rail is set to, thats the effective Vdimm as well.

Sense Wire refers to the thin wire that is going into the same slot as the thick orange wire. Both are going into the plug from the psu that goes into the motherboard. The sense wire would be the one you would add a VR to in order to increase the voltage on the 3.3v power rail.

Basically you are turning the motherboard over and soldering a wire to the leg where the 3.3v wire from the psu would go to the appropriate place as indicated in his pics about the mod.

http://downloads.modlabs.net/bios/pic/4th-Method.JPG

[jlin453]

Ok another question, I've already done the VDD mod where you pencil the resister (from motherboardfaq). What would this vdd booster do?

Is a 24gauge wire too thin to make these connections?

eh, too much reading. DO I have to do the vtt mod?
I'm not sure I understand what the vtt mod does ( or what the vtt is in the first place)

[THunDA]

Well from what I gather from reading.. the vtt is supposed to be half of the vdimm.. when just doing the vdimm mod the vtt will not follow and be half of the vdimm unless thats modded also.. I dont think its required but from what it looks like it will help..

[jlin453]

SUCCESS! This was a really easy mod, just simple soldering. You have plenty of room to work with as long as you don't use a huge amount of flux. This was my first time performing a "real" task. I had practiced on a dead motherboard :)


As of now, my vdimm = 3.26V.

I also performed the L12 mod for the second time, but I don't think my mobile barton likes it. I'm getting blue screens at 225fsb. Guess I'll take that mod out and try again. Plus it could be my CH-5's, dunno.

But back on subject, vdimm's at 3.26V!

//more blue screens :( --everything's unstable, even at relaxed speeds :(. Prime is failing or there I get the BSOD

[Hell-Fire -XS-]

Vtt/Vbt is importane once you start hitting past 2.85v Vdimm. Since on most NF7's the Vbt stops at around 1.45v, then anything past 2.8v Vdimm doesnt bring the Vbt along for the ride. The Vbt is important for ddr stability while under heavy overclocking and high Vdimm.

If your Vdimm is set to 3.25v, then Vbt should be half that or 1.625v.

jlin453, when you said SUCCESS...what mod was that in reference to btw?

The Vdd Booster basically sends the 5v rail thru the Capacitor that is responsible for handling spikes in the Vdd supply. My understanding is that adding the extra voltage straight in will help to prevent big spikes.

[jlin453]

by success I meant the vdimm mod in that picture worked, which is the only one I tried. I took off the heatspreader on my CH-5's and it helped a bit. I'll be doing the other two mods then.

Thanks for the help hell-fire :)

[squads]

sweet i might have to try this, except i'm not good at soldering. can anyone suggest a wire gauge (i think i have 22) and what type of solder to use. also how do i use the flux?

my Vio is at 3.34, so i'm kinda iffy about making my Vdimm that high. then again if i can get 250 w/tight timings it might just be worth it.

Jlin is the Vga Silencer worth getting? i can only get stable up to 418 on my core before i start getting artifacts. i think it can go higher, but heat is holding it back.

[jlin453]

Originally posted by squads
sweet i might have to try this, except i'm not good at soldering. can anyone suggest a wire gauge (i think i have 22) and what type of solder to use. also how do i use the flux?

my Vio is at 3.34, so i'm kinda iffy about making my Vdimm that high. then again if i can get 250 w/tight timings it might just be worth it.

Jlin is the Vga Silencer worth getting? i can only get stable up to 418 on my core before i start getting artifacts. i think it can go higher, but heat is holding it back.

vga silencer=seeing how it's only $10 + shipping at svc (check cyberdeals for coupon code), I'd definitely jump on the deal. You can overclock to around 450+mhz on the core with it.

I'm using 24 gauge wire. Not sure if it's too thin but it's working fine right now.

What type of solder? Try getting the thinnest you can. Practice soldering on something else if you don't trust your skills yet. Lucky for me I had a dead motherboard lying around to work on :)

[squads]

oh sweet, the 10 dollar deal still works, time to get one....

[squads]

oh sweet, the 10 dollar deal still works, time to get one....

[El<(')>Maxi]

Jlin I had an NF7-S running a VDIMM mod(not this one), and CH-5
It was totally useless with that memory(Hyper-X 3500), to give it more voltage. In fact just as you are seeing, it made everything unstable.

Now if you have a little patience, then maybe you can work things out and burn the memory in a bit. I could not stand it so I turned the CH-5 for some BH-5 which solved the problem of high vdimm and low FSB. Not sure why one would want this vdimm mod over the normal one however, other than ease of doing it. You can't adjust the dimm Voltage this way unless you have a controllable rail.

[PerlAddict]

Antec True Control 550W ... I knew I'd have a use for that panel at some point. :D

Anyone got a link to a site to buy some good, thin solder? And maybe some superfine tips, too? The stuff that came with my iron that I got at WalMart was pretty thick, and it only had three tips, and the smallest still didn't look that small.

I've got a ton of old speaker wire lying around ... that should work fine for one of these mods, shouldn't it?

[jlin453]

I don't know, I bought all my stuff at Fry's. Wire and thin flux isn't too expensive, just a couple of bucks. I bought a cheapo $4 30W iron, works like a charm :)

[squads]

where'd the pic go?

[joekool81]

Oh man just the mods i need to know about. My luck is that i have the antec tru 550wt.
Ok question. Should i dot he Vdimm, Vtt and booster mod all at once, to achieve the best results?
From what ive read you do them all and then you can crank up the voltages right. If i do this then i dont need to do the vdimm mod under the memory, right?
One last thing should i do the VDD mod for the northbridge, using the 15turn resistor? i have it water cooled with an 80wat pelt?

All input would be greatly appreciated.
Im going pull my board in a few days. i just need to finish making my mosfet heat sinks.