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When should I stop OCing? - Page 3

post #21 of 27
Thread Starter 
yeah i dont like increasing the vcore TBH. Its stock vcore is around 1.3v. I am only at 1.5v because the system became unstable (and yes i incremented at small steps to reach this voltage) - PCMark05 was running and just stopped and disappeared when it was doing the audio and video compression tasks. So i guess its saying my system is not stable? Or is this a problem with PCmark05? This is the main problem i have now - i am trying to get PCMark05 to give me a result, and i am 1.4750v with FSB at 234 and it still keeps crashing. So i guess i cant get my system stable at the current OC. Guess i will have to lower it for now. Memtest and Prime95 are ok - no errors. Just god damn PCMark :-(

i have a stable overclock - 232FSB voltage 1.4750v. Need to do the memory now. Temps are 39 idle and 51-55 load. Im not prepared to increase it further until i get better cooling. A weird thing is my voltage is set to 1.4750v in the BIOS but when the CPU is under load it drops to 1.39v. It only stays at 1.48v when its idle.

i realised what i had said in the previous post when i got in bed last night - sorry you guys have overclocked more than me :-)

edit: what does this mean:

lapp that and the ihs and use as5 and ull see some better temps

I know as5 is arctic silver 5 which i use already. I know that you can take off the cover of the CPU (which is the IHS but i dont want to void the warranty), but what is lapp???

What kind of temps / speed differences can i expect if i remove the IHS?
    
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post #22 of 27
Quote:
Originally Posted by jpmad4it
edit: what does this mean:

lapp that and the ihs and use as5 and ull see some better temps
Due to the machining process every heat sink will have a rough surface. To the naked eye it may look flat or even feel smooth; however there are microscopic grooves in the surface. These grooves will trap air between the heat sink and the CPU, and cause a poor transfer of heat.

Thermal compound (Artic Silver, Nanotherm, etc.) is used to fill these grooves and help transfer the heat from the CPU to the heat sink. Just like air, thermal compound is something else that the heat has to pass through to get from the CPU to the heat sink.

One laps the heat sink to make it smooth, allowing it to get the best possible contact between the CPU and heat sink. Even after lapping, there will still be grooves for the air to be trapped in, but the grooves will be much smaller, and cause less of a problem.

Lapping can be done on any heat sink, pelt, or water block, regardless of its material. Just keep in mind that a softer metal will sand away faster than a hard metal.

Quote:
Originally Posted by jpmad4it
What kind of temps / speed differences can i expect if i remove the IHS?
Expect ~2 - 4 degrees Celsius lowering if you remove the IHS and ~1 - 4 degrees Celsius lowering on IHS lapping. The disparity is because some heat spreaders are more rough than others.

Also keep in mind that not only will your temperatures decrease but what is also important is that the time it takes for the heat to dissipate will lower considerably as well.

R
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post #23 of 27
ya i lapped my cpu and say about 1 4c temp drop at load, i have not lapped my heatsink yet and i wont untill i get a big typhoon, but as you said if ou do not wish to void your warranty,lol dont do it!
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post #24 of 27
Thread Starter 
so lapping is done to smooth the surface of the heatsink? but how is it done?

also is the big typhoon better than the xp-90c heatsink with a zalman fan on it (what i have at the moment)
    
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post #25 of 27
REPLYING TO ROPEY A WHILE BACK : Sorry, major type-o. I meant to say Vcore shouldn't exceed 1.6, but acciedntally said it should! Staying under 1.6 can't fry a CPU can it?
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post #26 of 27
Quote:
Originally Posted by Kopi
REPLYING TO ROPEY A WHILE BACK : Sorry, major type-o. I meant to say Vcore shouldn't exceed 1.6, but acciedntally said it should! Staying under 1.6 can't fry a CPU can it?
No what ropey meant was your whole post was not accurate(sp) You were trying tell the thread starter(jpmad4it) that he could
Quote:
put your VCore up to 1.75 if you wish
but that is not right. Ropey was saying that you and (jpmad4it) have 2 different processors, yours being an older northwood, and his being a newer prescott. Your old northwood is a less efficient(sp) CPU and thats why your voltages are much higher then the newer CPU's. He was also saying that if (jpmad4it) was to take your addvice and raise his voltage up 1.75v it would no dought DESTROY his CPU. Also 1.6v on a prescott would also more then likely lead to a instantly dead CPU unless temps were sub-zero.
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post #27 of 27
Thanks. I can't believe i said he should raise it past 1.75, thats insane. I even know thats wrong! I must have meant 1.575? I must have been out of it or something. Sorry for that, I didn't mean wrongful advice.
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