p3 700 Overclocking, to up the voltage or not to?

[vipez888]

I currently have my p3 700 cb0 FCPGA oem phillipines, system stable at 994mhz@ 1.9V air cooling, large generic heatsink w/thermal paste.

384MB PC133 RAM
30GB Quantum 7200rpm
Soyo 6ba+iv BX
Lansys NEC 10/100MBPS
Voodoo 3 2000@180mhz

At 1008mhz, Its not quite stable, I got BSOD, but was able to shutdown still, do you think I should up the Voltage to 1.95V(will it even help, risky)? currently I'm getting 48C Max load @1.9V before BSOD. Is really worth the extra 50MIPS/36MFLOPS ?

[JaY_III]

your temps are a little high....
you may want to get them lower first, then deal with voltage...
that may be the reason why your CPU doesnt like 1008....

or it could just be that fact your CPU doesn't like speeds that fast,
your PCI speeds could also be the fault....

[DaveB]

Jay is right about the temp of 48C. Unless you have an Asus board (they give false temp readings), you need better cooling. I'm running a PIII 700 @ 994 MHz but with my Alpha PEP66 the temp never exceeds 34C. The core is at 1.95V, so that's no problem as long as you have good cooling. Keep in mind though that 1 GHz is just about the limit for cB0 stepping PIIIs. I've gotten mine running at high as 1050 MHz, but it isn't stable so I just run it at 994 MHz. It's been running since July with abosutely no problems at all.

[vipez888]

Yeah, I have to agree the temp seems to be high.

994mhz will have to do, Next chip will be an AMD Thunderbird.

funny thing is, at 994mhz, comparing to Sisoft Sandra's benchmarks, my floating point beats the 1ghz Intel(I get 10more MFLOPS), (integer is slower by 27mips)

Thanx for your tips guys.

Best regards,

Viper.

[6502kid]

I would look at getting everything else in the system all
optimized before messing with the voltage.

I thought I had everything tuned up on my system, but was
still getting page faults and shutdown problems with anything
higher that 140fsb speed. (800EB)

I ran for a month at 1.7v, then a few days at 1.75v, but no
change. Still stable at 140fsm, but page faults & lockups
at 150.

Then I read the BIOS optimization guide out at
www.rojakpot.com/Speed_Demonz.htm

My experience has alway been that the 1st thing to look
at to speed up a PC, even before attempting to OC, is to enable all the various system\video BIOS and RAM
cache/shadowing options in the BIOS setup.

This was a great idea in the past, but with the new memory &
video card speeds out there, it may just cause problems.

As soon as I disabled ALL the shadowing/caching, my system
ran stable at 150fsb, at the default voltage of 1.65. Air cooling.

Almost no change in either Sandra,TestCPU or 3dMark2000
benchmarks with all these settings disabled.

I may be playing with toggling these settings some to find out
exactly which was causing the page faults. Probably video
BIOS....

I just mention this because some of the posts here look like
people may be hoping to fix a problem that is caused by
either a BIOS setting, or worse an OS or application problem
by jacking their CPU voltage up to insane levels....

Perhaps I just got lucky, but my chip dont seem to want no
more volts. Runs cool even...

[wild_andy_c]

I would stay at 1.90v and perhaps drop speed just a little to decrease temperature and increase stability foir a while.

Burn in for a bit, and then try upping FSB again. You may get extra performance then at cooler temperature. A theory.

[vipez888]

wild_andy_c (Feb 04, 2001 12:06 p.m.):
I would stay at 1.90v and perhaps drop speed just a little to decrease temperature and increase stability foir a while.

Burn in for a bit, and then try upping FSB again. You may get extra performance then at cooler temperature. A theory.


Actually originally my cpu was only stable at 980mhz, but after 3months, I can now get 994mhz, you may be right, about letting it burn in for a while.

PS, I just tried upping going to 1.95V no go at 1008. I'll probably need to burn in at 994mhz for a while before I move up, but looks pretty slim for that ghz. At least at 994mhz my floating point beats the 1ghz (sisoft sandra) except the integer is slower.

[MartinT]

In the cpu database there seems to be a ****load of 700e systems running close to1Ghz AND with vcore not much more than default. The 100mhz 700 is a marvel of engineering and will run fairly cool at 900 or 933 with a good hs/f combo. I'm using a golden orb right now, a 700e@899 with vcore at 1.7v after 8 months I don't even bother with my mobo monitor utility anymore (temps are never higher than 32C). Get a GOOD heatsink/fan and some arctic silver OR get a peltier if you need to reach 1Ghz.

AMD cpus can be real scary, my buddy uses the FOP38 and he can't get his cpu temp below 40C. We should be thankful.