PIII800EB is it overclockable?

[wolfy]

hi all i have a friend that has the following:

soyo motherboard sy-7vca2
with a PIII800EB.
when he tries to o/c the system hangs @900.
what can be going wrong?
by the way its got the via chipset i think 686.
wolfy

[mark]

There can be a few things that really need to be checked over;
1. What is his Core Voltage set for?
2. What kind of Heat-Sink is on it? (if possible, what are the temps)
3. Where does it hang? Does it try to POST, go to windows then freeze, or just not even bootup.
4. Something that may help would be pc 133 ram, not pc 100 ram.
5. A new heat-sink would help if it gets too hot, or there is a cheap-o one on there now
6. Try some 'Burn-In' tests. The ones most people use are Prime95, Seti@Home, and 3d Mark 2000. I use all 3.
Hope some of this helped.
Mark

[wolfy]

thanks mark

i will find out what he has it set at and get back with you

now i have the following for myself

PIII733EB@853 fsb@155
voltage is @1.7
anything i can do to reach 933?

wolfy

[mark]

PIII733EB@853 fsb@155
voltage is @1.7
anything i can do to reach 933?

a 200mhz jump on a EB chip is very do-able
again do some burn-ins, bump the voltage up, and if needed get a new heat-sink.
Mark

[DaveB]

200 MHz on an EB CPU very do-able? I don't think so! Let's do the math using wolfy's 800EB as an example. The multiplier is fixed at 6, so to get to 800+200=1,000 MHz the FSB would have to be set at 1,000/6=167 MHz. Some observations on this.

1. Most motherboards top off at 150 or 155 MHz.

2. At 167 MHz, the PCI is way out of whack: 167/4=41.6 MHz. Many hard drives won't like this.

3. Not too many sticks of SDRAM will run at 167 MHz. You can run the SDRAM slower with a VIA or i815e board, but total performance will suffer. So, what's the point?

4. No BX board can do this since the AGP would be at 167*2/3=111 MHz. VIA boards are out because they don't have FSB selections that high, and even if they did, can't really run over 155 MHz anyway.

So, yes it can be done, but it isn't very likely. Your only chance for a 200 MHz jump would be using an i815e mobo such as the Asus CUSL2 with FSBs up beyond 155 MHz. You then should get the best Mushkin SDRAM available, and hope your hard drive and PCI cards can hack it. Even then, your chances of success are probably less than 10%.

[[OC]_SR20DE]

Yepp.... jumping from 733EB(any EB chips) to 933 is out of mind. That guy is expecting that chip like an E based chips, haha. You really need a "miracle" to get it that high and you are going to have to use some Exotic cooling and still not likely you'll make it.

[wolfy]

MilkPowder (Feb 08, 2001 12:41 p.m.):
Yepp.... jumping from 733EB(any EB chips) to 933 is out of mind. That guy is expecting that chip like an E based chips, haha. You really need a "miracle" to get it that high and you are going to have to use some Exotic cooling and still not likely you'll make it.

i see. now my bud has the PIII800EB its a flip chip. i have a slot 1 with the 440bx chipset. im very pleased with my system and its performance right now.

3dmark2000 score of 7702.