Need some hardware guru input...
I have a P3/800 system that will not run at 800. Here's a rundown of everything I know about it:
Jetway 993AN/AS motherboard, VIA Apollo Pro 133 chipset.
Intel P3/800EB, Slot 1, SL3XQ Costa Rica (800/256/133/1.65V S1)
(2) 128 meg sticks of Hyundai PC133 RAM
Creative Labs GeForceMX card, 32 meg
Creative Labs Ensoniq Audio PCI sound
Realtek 8139 chipset NIC
2 Western Digital hard drives, one UDMA/33 and one UDMA/66
generic 40x IDE CD-ROM, Pacific Digital 4x CDR.
250 watt power supply
If I set the FSB speed to 133, the system will boot into Windows then freeze and make me power it off. I tried all the tweaking I could think of: flashed the BIOS to the newest, d/l and installed all latest drivers, installed DirectX 8.0 runtime, installed VIA 4 in 1, etc.
I tried running it at 133 FSB, with the memory set to run at CLK-33 (100 MHz) to see if it wa the memory that was the problem. Same lockup problem, and when I run the FSB at 100 and the memory at CLK+33, it's stable.
CPU is not getting very warm. I do not have a temp probe, but it's a standard heatsink & fan mounted with heat sink compund.
I dial the FSB back to 124 and run the system at 744 MHz and it runs fine. I started Prime95, System Monitor (to watch CPU usage), ran an MPG looping in the foreground, and left the clock open so I would know what time it froze, hehe. Left this all running for 2.5 hours with the system at 744 without a hitch. Also the CPU got much warmer than I had ever felt it without giving me any problems.
Heat is not the issue. I tried running the system with the air conditioner blowing directly into the case and it still locked at 800, though the components were cold.
I can not address the CPU voltage, as this board neither monitors it nor allows the user to control it.
I've been working with PC hardware for a loooong time, and this has me whupped.
Rock solid at 744, dead at 800? Any and all input is welcome.
Gersen