I have a ThermalTake 480W Silent PurePower (Brand new). I had a Generic 420W before, which did just fine. I replaced it about a month ago just to be safe (and because the LEDs were damn annoying).
I have a ThermalTake PIPE101, and ThermalTake SilentCat 92mm fan. (Can you tell i trust thermaltake?). My temps are actually high, but I'm positive that the temps arent a problem. with 1.575, I idle around 48-50C. Load is around 65-67C. I realize that these temps are pretty high for an A64, but i have extensively tested temps on this specific CPU, and it can take up to around 78C before the damn mobo starts beeping from Abit temp EQ. Around this temp, i start to get worried, regardless of evident stability
I think the CPU can tolerate even higher temps, but I dont feel the need to endanger either it or the system through pointless "peak" tests.
Currently, I have taken to testing the system with an open case (Silverstone TJ06, without wind tunnel), and have plenty of circulation.
I'm pretty sure its not power (unless the thermaltake purepower has a reputation as an unreliable PSU; I wish MPC would had included it in the recent PSU roundup...)
I'm also pretty sure temps aren't the problem. I get plenty of circulation, and I know the limits of my CPU.
To recap my initial post, i believe that my mobo is the limiting factor in my OC, and that my CPU still has some potential to show. I think the mobo just cant take the FSB, because even at a lower clock speed with higher FSB, the system fails. Memory is underclocked for testing, but is rated for around DDR433.
Perhaps the CPU doesnt like FSB, but can take clock?
Does anyone know any ways to increase multiplier? Its factory locked, so i dont think its possible...
One last clue:
When i run a simple stability test, such as the burnin suite of Sandra 2004, the system is fine. It is only in full system tests, such as a 3D app, that failure occurs. Again, video card is not OCd, and PCI/AGP is locked. This suggests failure of the northbridge to me. I have tried tweaking NB voltage, but it doesnt matter.