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Overclocking an old computer

post #1 of 13
Thread Starter 
I have decided I want to give overclocking a try before I overclock my future computer.

I have a P4 2.5GHz and my mobo is a Gigabyte GA-8S650GXM.

The original FSB is 100 and the mutiplyer is 25.

I started by increasing the fsb to 105 which totals 2625Ghz. I ran Orthos for 15 mins under the stress Ram and CPU (blend) and then I ran it to jut stress the CPU (small FTTs) for 15 mins as well.

Using speedfan and Aida32 my temps maxed at 52C on stock voltage.

Should I test longer in Orthos before increasing the FSB?
How are my temps? How much higher will should I let them go? How much will the temps change if I just up the FSB and not voltage?
post #2 of 13
If it's on stock cooling, I'd push a little bit farther, but not much more. 55-60C load is the upper limit that I stick to when overclocking. You've got the right process down so far, so when you feel comfortable, just start doing it on the new system.
R'lyeh
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R'lyeh
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300GB WD VelociRaptor, 320GB WD Caviar 7200 Lite-On 20X DVD+R Ubuntu 10.04 x64 / Vista Home Premium x64 Samsung 226BW 
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post #3 of 13
Under 60 seems to be the consensus of safe here at overclock.net. I personally let orthos runs for 30 min between each FSB step up. IF no error and temp allows then up again. Once you get to where you are pushing upper 50's in temp run orthos for 8 hours to test stability and monitor temps that the stay in check. The P4 are a hotter running core so you probably won’t get much more on stock cooling.

Once you switch to the C2D then use TAT for temps.

Good luck
Black Knight
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Black Knight
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post #4 of 13
Thread Starter 
How does 8 hours change from like 30 mins or so? Does the temperature keep increasing?
post #5 of 13
8 hours gives the temperatures a chance to more fully stabilize, giving you a better feel for it.
R'lyeh
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R'lyeh
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post #6 of 13
Thread Starter 
Alright thanks man.
post #7 of 13
Pin mod the cpu by insulating or breaking off the A6 pin. It will make the cpu start at the 533mhz FSB instead of 400mhz..and make your CPU at 3.3ghz..its the easiest way..and works great on the 400mhz FSB cpu's.
post #8 of 13
Thread Starter 
Ok I upped the FSB to 110 (25x110 = 2750Ghz).

I ran both of the tests in Orthos again (15 mins each).

It seems stable, and the temps maxed out at 55C.

Do you think i could decrease my voltage to decrease my temps?

I am thinking of going to 115 FSB
post #9 of 13
heck no..its an old cpu..it can hang.

You really should try the pin mod..its super easy and would save you from doing exactly what you are doing now...a little at a time. The pin mod, tricks the cpu into starting at 3.3ghz by default...no adk=justments other than vcore needed.
post #10 of 13
Thread Starter 
Well I am a little hesitant to pin mod as this is my first time OCing, and my CPU starts at 100 FSB not 400. Also if this computer dies I will have noting for a couple weeks.
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