DO NOT DO THIS Vcore MOD AND THE OCW Vcore MOD AT THE SAME TIME! There have been reports of some kind of problem when doing both. NEVER DO 2 Vcore or 2 Vdimm MODS AT THE SAME TIME, the Vcore could be 1.8V or higher! If you do the mods, your doing them at your own risk. The Rebels Haven Computer Forum will not be responsible for damaged systems or components... If your unsure about the mods, I strongly suggest you do not implement them...
Vcore Mod For 1.70Vcore Soldering a 5.6K resistor as shown below, increases the Vcore by 0.25V. The BIOS will read the new Vcore fairly well and the max setting of 1.45V(Winchester) in the BIOS, yields 1.7V to the CPU. If the 0.25V increase is too much for your liking, a Variable 20K or 50K resistor can be used. Here's some resistors and the Vcore increase they will generate, for the CPU's available:
5.6K-->+0.25V Use this for "Clawhammer" type CPU's 7.5K-->+0.20V Use this for "Winchester" type CPU's 10K--->+0.15V Use this for "Venice/SanDiego" type CPU's
Note that the resistor can be any tolerence you can find, although I recommend 5% or better to get a fairly accurate output. Also, there is almost no wattage in the resistor, so as small as possible will make soldering easier....
You do not need any Vcore mod if your running "Opteron" type CPU's. But if you want a +0.1 increase, use a 12K resistor.
The resistor is connected to the left side of C607 and the right side of C600:
For those with a Digital Multimeter, here is where to measure Vcore. Any one of the 3 points is Vcore. Connect the ground or negative lead, to the I/O plate in the rear of the system, or to circuit ground if you know a ground point.
Vdimm Mod For 3.13Vdimm Connecting the 2 points on the Motherboard with a wire jumper, delivers 3.13V to the Memory Modules. If you have the ability to adjust the 3.3V PSU bus higher and lower, you have adjustable Vdimm! Don't forget the Memory Modules will need a fan blowing on them at 3.13V
Edit: Vdimm Mod For 3.3+Vdimm Tests have shown that the Vdimm mod above, delivers a safer 3.13Vdimm to the memory modules. For 3.3Vdimm, you need to connect any Orange wire from the PSU to the jumper I have shown in the picture.... I have mine that way and there is no problem...
DO NOT DO THIS Vcore MOD AND THE OCW Vcore MOD AT THE SAME TIME! There have been reports of some kind of problem when doing both. NEVER DO 2 Vcore or 2 Vdimm MODS AT THE SAME TIME, the Vcore could be 1.8V or higher! If you do the mods, your doing them at your own risk. The Rebels Haven Computer Forum will not be responsible for damaged systems or components... If your unsure about the mods, I strongly suggest you do not implement them...
Edit: The jumper will be at the Vdimm potential and that is where one measures the Vdimm potential. Before the mod, the small pad where the jumper would be soldered to, is the Vdimm...
Here I put an arrow pointing to the points that are Vdimm. Once the jumper is in place, the jumper is Vdimm also.
-------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 24294 | From: Fire Island, NY | Registered: Feb 2003
posted
hello with all! first of all I am French and I do not know English then I use the translation of google, then you do not astonish if the language is odd! veiled I have make the vmod to have 1.55v with band adhesif and a small end of wire of copper and that functions very well, with my opteron 146 I am stable max with 260*10 and with the top it is not stable, then I tried to make the vmod 1.7v with a resistance 5.6k, but instead of welding resistance directly I welded 2 wire electric and I connect resistance between these 2 wire, but that does not function! does all the élements seem to turn but nothing with the screen, the disc seems boot then buckles why that of it does not function? I do not know anything in resistance but mine is green clear with the rings of colors: or/rouge and blue with another of green color darker aubord of resistance, one assurré me that it is 5.6k but as that resemble not with that which is on the photograph, if somebody can explain me why my vmod does not function I will be very delighted because I need 1.65v absolutely! thank you for your reponses! PS: I have the official bios 1.20, think that the bios beta will allow me to improve my o/c?
[ October 31, 2005, 01:11 PM: Message edited by: Polygon ]
Posts: 14 | From: FRANCE | Registered: Oct 2005
posted
it is a good thing which you include/understand language google! not I do not have make the 2 MOD in same time, when I connect resistance I enleve the MOD 1.55v but in spite of that that does not function, I have just changed the bios for OCW beta 1.15 and my system always refuses to function with the top 270htt, but I will replug resistor to see whether the MOD 1.7v will go!
Posts: 14 | From: FRANCE | Registered: Oct 2005
posted
they is true that it is difficult to include/understand with the translation of google, but I peus not to make differently, this chart is not very known in France and there is not many furum which speaks about it and I do not have anybody who speaks English with me, I use wondows xp pro sp2, when I connect the resistor all the elements seems to function but there is nothing on the momitor, I hears the disc which tests boot into permanent, I put myself questions according to: * be what the fact that I did not weld the resistor directment onto the chart but to connect between the 2 wire electric which poses problem? * be what this MOD functions with all the bios? I have just put bios OWCB1 but to try not yet to connect the resistor! * my resistor is of color clear green and not brun with the rings of color: or/red/bleu and another dark green on on the edge, that made that there are 4 rings of colors of them and not 3 as on your photograph, be what it is the good resistor? I do not have anything for the verifier! I you thank to have to try to help me and if I board not solution here I will be obliged to give up this MOD and I will be satisfied some with 1.55v
Posts: 14 | From: FRANCE | Registered: Oct 2005
posted
without the resistor the system functions very well, and when I connect the resistor that made like if there power the PC with 350htt it is nothing with the monitor there with 1.55v it is stable with 260*10 but not 263htt, then I need more volt
Posts: 14 | From: FRANCE | Registered: Oct 2005
posted
the place is good the same one that on the photograph, they is true that I have doubts about resistor because it does not resemble that on the photograph, but the person who gave it to me said that it is well 5.6k tomorrow I to the store will take of other resistor 5.6k and if that still does not function I give up!
Posts: 14 | From: FRANCE | Registered: Oct 2005
posted
I espere that it is that so not I will be too sad to be blocked with 2600mhz because my goal is 2700mhz 5.6k is only the value to make this MOD? or one can put of another value?
Posts: 14 | From: FRANCE | Registered: Oct 2005
Damn Phenoms!
![[Frown]](frown.gif)
