Hi, can anyone tell me if is this cold boot bug on this mobo when you turn it on after having it shut off for awhile? I keep having this problem  |
| I think my problem might be I need a FSB volt mod? I read somewhere that it is different then the vmch mod. You pencil in a different place? |
| I've of course tried memory by spd at 2.25v I am using Corsair 2gb PC-8500 5-5-5-15 (the dominator ones without the dominator heatsinks) and no go. I have also ran the board at 385 with mem 4-4-4-8 no problems. It is definately the vmch or cpu somehow not wanting to go over 385 fsb. And I did not think the bios could override a pencil mod, but I read somewhere on the net that someone had the same problem as me. Meaning after the pencil mod got over 1.65 volts mch,say 1.7 or 1.75, the board would not post just black screen until the mod reversed and lowered back to 1.65 or less! It's almost like if the bios's maximum vmch 1.65v setting is overvolted the board just doesn't turn on to safeguard it or something? Anyway around this? |
| A few pointers to try, 1. try SPD RAM settings 1st if you are trying to get past 385FSB else try Micron D9 RAM which allows manual RAM setting on the P5W 2. 1.65v is good enough for my old rev. P5W to hit 400FSB when using 2 sticks of RAM 3. BIOS cannot over-ride hardware mods AFAIK but as said above, you may not need the mod to go past just 385FSB |
| I have an old (original vmch 1.65 max) Asus P5W DH. My FSB limit is about 385 no matter what vmch I set. So I followed your guide for the pencil mod, bought a multimeter, etc. I spent hours with the pencil getting the ohms down from the original 447 to 317 and everywhere in between. My original vmch when set in bios to 1.65 was more like 1.45! My problem is my machine refuses to boot when I pencil the resistor. The most I ever got it to boot at was 1.65v, which is the EXACT same vmch as my top bios setting! I have heard that there is possibly no way to boot with the vmch over 1.65 because of the bios safeguard? I penciled and can read about 1.75v at around 317 ohms, but of course no post at all. What can I do? Thanks |
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| wat fsb? are u sayin u are alrdy at 500+ fsb? if u are i dont tink any other mods can help get much higher. |
| ive done the mod but i cant past 510, before the mod just got 505 and after i solder the board and give the NB 1,9v it didnt make a big move on fsb? my mem ive tested already and can run 550@2,6v with no problem even i tried multi 6 cant even move the fsb higher any other mod that i miss here?vdrop maybe? |
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| okay probably try lower.. do you remember how far you had to reduce resistance for say 1.75v vcore ? |
| perhaps, try lower, BIOS isn't that accurate often round offs can check with meter. |
| shamino i'm trying vcore pencil mod but even with vcore set at 1.5v = 1.472v-1.488v default reducing resistance from 817 ohms to 786 ohms still gives me 1.5v = 1.472v-1.488v in bios ??? was my reduction in resistance too little for a vcore increase ? |
| Well did it hehe The default multimeter measured vdimm was as follows bios setting = default real = pencil mod result AUTO = N/A = 2.040v 1.80v = N/A = 2.040v 1.90v = N/A = 2.040v 1.95v = N/A = 2.088v 2.00v = 2.007v = 2.118v 2.05v = 2.066v = 2.178v 2.10v = 2.110v = 2.228v 2.15v = 2.173v = 2.296v 2.20v = 2.231v = 2.340v 2.25v = 2.273v = 2.388v 2.30v = 2.312v = 2.430v 2.35v = 2.375v = 2.478v 2.40v = 2.419v = 2.524v N/A = forgot to measure LOL IIRC, folks report a 0.03v vdimm droop under load, i didn't measure the droop under load so probably minus 0.03v vdimm from those final values under load  hmmm while i have more vdimm, I'm not getting the same max clocks for my memory now. Before using 2:3 divider, 540mhz 4-4-4-12 at 2.4v memtest stable, but now at 540mhz 4-4-4-12 at 2.3v bios (2.419v) and 2.35v (2.478v) unstable. But seems i'm more stable at 4:5 now.. maybe heh before Pair #2 * 510mhz 4-4-4-12 at 2.20v * 519mhz 4-4-4-12 at 2.25v * 523mhz 4-4-4-12 at 2.30v * 533mhz 4-4-4-12 at 2.35v * 541mhz 4-4-4-12 at 2.40v after testing right now |
| shamino, will the pencil vdimm mod be adjustable as you change vdimm in bios or fixed at what ever penciled in vdimm we set ? i.e. would pencil mod say increase each vdimm setting by say 0.15v so 2.1v in bios = 2.25v and 2.25v in bios = 2.4v and 2.4v in bios = 2.55v vdimm or fix it all at 2.55v ? |
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| i shaded mine for vmch mod but in bios still 1.65v max and according to my digital multimeter it is 1.62v. do i need to shade some more to get to 1.85v? |
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| tried this vmch mod and it works but it has a few bugs on my board...First I set bios to 1.65 vmch and then I read the peg on the picture with my dmultimeter..It reads 1.5, I lowered resistance to 400ohms and it now reads 1.58....Whats going on here...Should I just ignore what bios is saying and completely go by what the read out it getting.... Would like to know...thanks cheers.. |
| Anyone has pencil mods for P5B dlx? |
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| to measure ohm u no need to on com..just measure and see the ohm.. should be exactly like the one on the guide.. then u use a pencil and shade at the point.. measure again see if theres a difference.. after u measure theres a 20ohm difference(basically we are looking at 20ohm lower then the original value) then u try on ur pc and measure the volt.. it should increase.. |
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| @sham, How r we gonna measure the voltage with PC turned off??? Do we need to shade the chip first and then power on the pc and measure using multimeter??? Or we do not need to power on the pc and just meaure using multimeter after shading with pencil??? |
| http://img241.imageshack.us/img241/6...closeupls8.jpg Those the ones, marked with red dots? Was probing around those yesterday as it happens, decided to try an figure something out myself just for once Droop doesnt seem bad from measuring those, unless it only really shows at higher voltages. |
| mosfet legs just bside cpu socket, read them, CAREFULLY |
Thanks for another damned useful guide Shamino  VMem seems accurate..ie..BIOS actually matches actual! Is there a physical VCore read-point? I want to know how bad the droop is Kenny |
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but many dont wanna solder or are scared of it so this ais an alternatyive it is a good choice but differing opinions all aropund i'd say its one of the top 3 choices, gigabyte ds3 and the p5b together in the list |
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set vmch to lowest, measure. then reduce 20ohms w pencil and measure again. let's say u see a +0.03v increase. then scale it linearly roughly to see what resistance and target voltage u need |