View Full Version : Pentium D 840 1066FSB "Pad Mod"
markodude
01-07-06, 04:36 AM
Hi people
I could not get my 840 or my 950 to POST above 240FSB or so with my ASUS P5ND2-SLI, regardless of multiplier (840 goes to x14 950 goes down to x12).
I decided to bite the bullet and "pad mod" the 840 CPU to get it to default 266FSB, although I did not really think it would work......well it did! This is acheieved by connecting BSEL 1 and BSEL2 to pull BSEL 1 to LOW - creating L-L-L like the EEs
http://www.marklaurence.co.uk/840/cpumodsm.jpg
http://www.marklaurence.co.uk/840/clearbiossm.jpg
http://www.marklaurence.co.uk/840/autosm.jpg
Problem is though, even though it would POST, it was not stable - even 3.73Ghz with 266FSB was not stable, I tried lots of voltages and RAM speeds with no joy, I did get into windows and run a couple of benches but then it would reboot randomly, just like it did on the rare occasion I got it to boot higher than 240FSB.
:shrug:
I wanted to try the trick on my 950 but I dont think there is any point, for now I just have to wait on a better motherboard (ASUS P5WDG2-WS)
This mod may also be useful for people with no overclocking in their BIOS - I heard of people with Dell on 6xx CPU using this trick (you must have 925XE or better mobo).
:cool:
Interesting, I bookmarked this for future reference. I hope it works for the 9XX series too.
markodude
01-07-06, 10:22 AM
This *should* work on any LGA775 processor with default 800FSB. Check the datasheets for more info :)
the P5ND2 is known for having trouble getting to high fsbs, just wait til you get the P5WDG2
D
Stratcat
01-09-06, 10:22 AM
Heh -
Haven't seen a BSEL "wiretrick" in a while. Nice to see someone's reading the data sheets! :cool:
Nice,
Strat
jmsandrsn
02-21-06, 02:01 PM
Did anyone ever try this with a Presler or CedarMill processor?
I tried the mod with conductive silver paint but had no luck. The system would not post. However, conductive silver paint has worked flawlessly for me on Prescot processors.
Maybe the 65nm chips have slightly different electrical specifications and the impedance or resistance from the paint is not in spec. Maybe solder would make a difference but I have no soldering skills.
markodude
02-21-06, 02:04 PM
Hey man, it should have the same BSEL settings as the 840 - I dont see why it wont work - what board did you use and did you test a prescott with this trick in said board?
Thx
jmsandrsn
02-21-06, 03:04 PM
Hey man, it should have the same BSEL settings as the 840 - I dont see why it wont work - what board did you use and did you test a prescott with this trick in said board?
Thx
The mod worked fine with conductive silver paint and Prescott in a Dell XPS 400 and also Gigabyte 8I945P-Pro (both use 945P chipset).
I've checked the data sheets and the layout and connections are the some for the BSEL pins. I can't help but think that are different electrical specs and the silver paint connection just doesn't cut it.
3DFlyer
02-21-06, 03:09 PM
markodude,
Great Research! I'll be watching this thread closely and it has been saved in my favorites.
BTW, this will give you another stripe to add to your black belt ubercl00xx0r skills. Pin/pad modding is serious uber. hehe :)
markodude
02-21-06, 03:10 PM
I just think some chipsets cant support dual core at such a high FSB - ie NF4 does not work with 266FSB 955EE processor, it wasnt stable at 250FSB+, really its only 975x that is designed to work at these speeds, 955x works ok though, any less than that you are probably going to have issues.
josh478
02-21-06, 03:17 PM
its probably that board. its garbage for overclocking despite what anyone else says. yeah, its got an sli interface... WITH NO OVERCLOCKING. ebay it and get yourself a p5wd2 unless you are so much in love with sli that its a must. (sli is a waste of money IMO)
markodude
02-21-06, 03:20 PM
I donno what board JMSANDRSN is using?!
jmsandrsn
02-21-06, 03:38 PM
I donno what board JMSANDRSN is using?!
I'm using 945P chipset boards which do officially support 1066 FSB and actually work fine at that speed. I believe Josh was referring to your P5ND2-SLI about not being very good for overclocking.
markodude
02-21-06, 03:42 PM
The P5ND2-SLI offifically supports 1066FSB also, it will do it with a single core but not a dual core - what I am saying is that newer boards/chipsets push the dual cores further in regard to FSB, there have been changes made, your 945P boards wont have the same capacity to push a dual core to a high FSB......
The only way to find out is to test your modded chip in a later board ie P5WD2-E and see if it boots in that :)
If Josh was referring to my board - I dont have a P5ND2-SLI any more, for the reasons mentioned ;)
Why don't you jumpering it out on the back of the mobo or try wrapping the socket pins with 50ga wire, tieing BSEL1 and BSEL2 low. Avoid taking a soldering gun to the CPU. Man you got a set of :argue: for doing that.
jmsandrsn
02-21-06, 04:08 PM
The P5ND2-SLI offifically supports 1066FSB also, it will do it with a single core but not a dual core - what I am saying is that newer boards/chipsets push the dual cores further in regard to FSB, there have been changes made, your 945P boards wont have the same capacity to push a dual core to a high FSB......
The only way to find out is to test your modded chip in a later board ie P5WD2-E and see if it boots in that :)
If Josh was referring to my board - I dont have a P5ND2-SLI any more, for the reasons mentioned ;)
CedarMill doesn't work either with the BSEL mod using conductive paint. This chip is a P4 641. The system will not even post. However it works fine at 266 FSB at default voltage in the Gigabyte 8I945P-Pro when I overclock using the BIOS. The only problem is that when you do a Windows restart the SATA hard drive does not get recognzied on the POST screen and the system is unable to boot. The problem does not happen from a cold start and the system is totally stable in Windows. With a P4 630 with BSEL mod in same board the hard drive does get recognized on a restart. I'm thinking that for some reason the PCI lock gets turned off on the restart because I've seen similar problems before with SATA hard drives not being recognized if PCI bus is too much above 33MHz.
Lee_Kay
02-21-06, 04:21 PM
to clock the cpu so high u need about 230 watts to power the beast. Thats almost 20A on the 12V rail.
markodude
02-21-06, 04:31 PM
Got you JMSANDRSN, I see your problem now - that would suggest that it is the chip, still dont understand why though :(
/me has flashbacks of VID pin modding P3s for higher Vc :)
The 775s with the pins moved to the board would be tough to wire mod. That's exactly what I did on the P3s proth and it worked great...much more solid than jumping the socket holes themselves with wire.
jm, I am not even sure why you'd want to bother if you can run 266FSB in your BIOS. Unless I am missing something, this is just a hard way to OC the proc by forcing it to run 266FSB by default?
jmsandrsn
02-21-06, 06:00 PM
jm, I am not even sure why you'd want to bother if you can run 266FSB in your BIOS. Unless am missing something, this is just a hard way to OC the proc by forcing it to run 266FSB by default?
2 reasons.
The motherboard will use a different bootstrap if it picks up the processor as 266 FSB and the problem with the hard drive not being recognized upon restart should go away. It's not really that big of a problem but is a small annoyance.
Also, this would allow the processors to run at 266 FSB in boards where that speed is supported by the chipset but the board has no overclock abilities.
The bootstrap is no different than setting 266FSB or higher via BIOS on a board that supports 1066 procs. Even AI Booster (desktop) forces a reboot for it when moving to either side of 266FSB. In fact, just altering the FSB in BIOS, you should see the DDR ratios change between 265->266FSB.
#2 is the only reason I could possibly see wanting to mess with it, but I'd buy a real mobo first :D
Good luck with it...curious to see if you get it working ;)
i know someone with a dell i believe its an xps 600, know if itll work with a 9xx chip ? they would kill to be able to oc it.
Pulled up some data sheets to see if this works with 9XX, it does, here they are...
FSB:
http://my.tbaytel.net/novaplus/pdmod/bsel.jpg
Voltage:
http://my.tbaytel.net/novaplus/pdmod/vid.jpg
I'm going to pick up one of those pens from radioshack (circut writter) w.e they are called, and will do this to that Dell *insert sinister laugh here*
quick question/ problem, I guess my radio shack/the source dosent have that circut writted stuff, would thermal paste work ok ?
get some electrical tape, mask off the 2 pads.
paint a connection over them with defogging kit repair paint.
costs about 10 dollars at any car store.
ask for "defroster repair kit".
would this be the right stuff ?
http://img164.imageshack.us/img164/2381/defoggeraj1.jpg
picked it up from canadian tire :) $8.97 :)
Also, is this stuff hard to remove if it dosent work ?
he also as PC2-5300 which is ddr2-667, would that work ? the mobo does supposed a fab of 1066 as it is able to take EEs and the 965
damarble
07-15-06, 12:31 PM
^^^ Yeah thats the stuff. :) I don't think it's too easy to remove though. Good luck, I'd like to see that Dell OC'd. lol
would this be the right stuff ?
http://img164.imageshack.us/img164/2381/defoggeraj1.jpg
picked it up from canadian tire :) $8.97 :)
Also, is this stuff hard to remove if it dosent work ?
he also as PC2-5300 which is ddr2-667, would that work ? the mobo does supposed a fab of 1066 as it is able to take EEs and the 965
Thats the EXACT stuff I got just 2 days ago.
it worked perfect for me.
just be sure to mask the area good.
when I did this mod to my Pentium D 930, I got it to work at 15 x 266 just fine... but I had a unforseen problem.
this mod disabled 1 of the cores, and then windows became impossible to load.
it might just be a side effect of this board though (DFI 975X) I really dont know...
but removing this stuff is super easy.
I just took my finger and rubbed it off.
it's kinda a tough rubbery stuff when its in place and dry, and its not hard to remove, but it will definatly stay in place for long periods of time if you need it to.
I think this mod, is better suited to the single core .65 NM chips.
I tryed it, but I think i may have gotten a little off onto another pin, so it wouldnt post, removed with some alcohol and with my finger nail :) will try agian tomorrow :)
So we will try this agian :) I cant post an pics cause i just left my g/f take the digital camera to her moms where she will be visiting for a month or 2. But I'll post comparision screen shots and what not.. a few anyways... super pi... will be back after...
must be a bum chip or needs more Vs. not success
hmm.. so why give up ? we wont :) I just need a little help here trying to place out where the vids are...
as in this pic below
http://my.tbaytel.net/novaplus/pdmod/vid.jpg
We would liek to try 1.5V CPU is currently @ 1.3250 by default.
http://my.tbaytel.net/novaplus/pdmod/layout.jpg
so where do we find those so we can add more Vs ?
Also. we dont be pin modding the fsb, we'll just use a windows app :)
jmsandrsn
07-17-06, 05:04 PM
must be a bum chip or needs more Vs. not success
The no success you mentioned...was that with the BSEL/PIN mod to 266 FSB? If so, did the system not even POST. I've tried Cedear & Presler processors in Dell system and have had no luck at all. System will not even post. However, Prescot processors work without any problems at all (ie. P4 630 @ 4.0GHz)
If you use one of the software programs to o/c the XPS 600 then you might be able to make it to 220 FSB but after that I believe you'll get a lockup.
yeah the 266fsb thing didnt work, were are only able to get 212mhz fsb then a lock up, needs more voltage.
regardless of multiplier (840 goes to x14 950 goes down to x12).
How did you get the multiplier changed at all? I've an 830 on a P5LD2 Deluxe motherboard, and I can't change the multiplier despite turning on "CPU Lock Free" in the BIOS; it stays at 15. And what's a pad mod?
Hmmm. Same idea seems to apply to go from 200MHz to 266MHz with an E4300.
Evilsizer
01-27-07, 08:42 PM
Hmmm. Same idea seems to apply to go from 200MHz to 266MHz with an E4300.
indeed my friend i thinking of the back in june when we got a hint of the E4300 coming out. the only thing is i would try the cpu in a good ocing mobo first then "pen" it. as you dont know what voltage it might need if tring to "pen" for that fsb. as seen right now though the e4300 should be able to handle the 266fsb on stock voltage.
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