PIII 600E / SY-6VBA133 Video Locking up

[DW]

Overclocking PIII600E/SY6VBA133 Soyo ?????????
Hi,
After years of building systems I finally am attempting to overclock my PIII 600 to get a little more life out of it. So I'm not experienced at overclocking. PIII 600E has been working great for 1.5 yrs at 600mhz.

Problem:
After attempting to overclock by raising FSB to 133 to achieve 800mhz, the video card locks up when either doing DirectX 8 AGP test or playing a intensive video game Operation Flashpoint.

System:
CPU: PIII 600E Slot One (SECC)2 Coppermine cA2
Standard cpu HSF 11-13cfm I think (common dual fan)
MB: Soyo SY-6VBA 133
Chipset Via Apollo Pro 133 (VT82C693)
Mem: 256m 100mhz (brand not sure)
Video Crd:GF2 Pro 64 (Gainward Golden sample)
Hard dr. 40gig 7200rpm IBM
SB Live
PwrSply: 250w UL
OS Windows 98se

Am running case open with exterior fan during this phase
avg case/mb temp after overclocking 80-85deg F


Mainboard settings
JP9 & JP7 pins both open to set FSB = 133
JP7 Open, JP2 (2-3) = Boot FSB 133 & AGP divider 2.0

BIOs Settings or changes
CPU Freq set to (133 x 6.0) 800mhz
Dram set to CPU FSB clock - PCI clock or 100mhz
APG 66mhz

Results:
Booted at 800mhz
checked temp in bios, CPU avg (95-120 f)mainly (110-115)
Windows boots fine, checked cpu with SandraPro, shows 802mhz at avg temp (95-110f) underload temp (110-115f).
I tried to raise the gainward video card settings through turbo software, but video became unstable. Returned video software settings to default or no turbo. Video still slightly unstable. So I raised CPU core voltage by +2.5%. Video was now stable, no scratchy screen.
At first everything appeared to work fine. I didn't test DirectX8 but just started playing Operation Flashpoint, both single player then Internet Multiplayer. Due to server I was playing on locking up had to reboot several times, and no problem. Then after about 1 to 2 hours of play video locked up in the game. Next tried single player video locked up everytime. Tried raising voltage of cpu but no effect.

I tried lowering CPU Freg to 733mhz (133x5.5) but booting always reported 800mhz and so did Sandra inside windows. So I thought I was doing something wrong and didn't continue.

I've researched the internet, and the average overclock for this cpu/motherboard config is 850mhz, this is even with 100mhz memory. So I believe I should be able to get 800mhz no problem, but have to change something with AGP card.

If anyone has exerience with this cpu/mb or is extremely knowledgeable about overclocking, I would appreciate some pointers.

Thanks in advance...

[The Doors]

Hi DW, welcome to the Forum,
First of all I suggest you to use MotherBoardMonitor to check your system temps, especially the Cpu that never must go above 45 degree C @full load (100% load), look at http://mbm.livewiredev.com/ to download the prg.
About the settings, well, you can manage only the Fsb to OC your chip coz the Multip is locked and unlockable, and rise also a little the Vcore to gain stability, but don't go above the 15% of the rated voltage that if I remember well is around 1.75v.
You're mem module can be the prob, coz Pc100 and not Pc133 like required by the system bus (Fsb) at 133Mhz, so try to go with the most conservative mem settings like Ras & Cas delay on 3 or use the Spd settings, onestly I don't think is the Vid card if the Agp bus is setted like you say on 1/2 of Fsb (66Mhz the specs) try only to set the Agp on 2x just to be sure.

I hope it helps ;)

[LutaWicasa]

Actually, having booted and everything OK. Running game for 1-2 hrs before lock-up, it sounds like a heat prob. That could be why upping the voltage more didn't help at all(more voltage=more heat). Multiplier manipulation doesn't have any effect, as mentioned Intel mults are locked. Yeah, it certainly wouldn't hurt to upgrade your ram, but I think ya need to look at your cpu, case and vid card cooling.

[Yodums]

Well in that case something is crapping out after the long load of cpu juice being squeezed :D ... You'll need to get a better fan.. That thing only does 13cfm ...