Russ heeft de vierde issue van z'n Celery Report klaar liggen. Er zit deze keer ook wat info in over het overklokken van de nieuwere C400. 6x75 en 6x83MHz gingen OK, maar 6x100Mhz was iets te veel van het goed:
Okay, now for the real test. With heart pounding, and hands shaking, I set the bus at 100Mhz (6x100), 2v. Fired her up; black screen, not even a video signal. Upped the voltage to 2.1, same result. Upped the voltage to 2.2, still staring at a blank monitor with no video signal.
I moved the voltage up to 2.3 and finally, a little action. Very little. I was able to get a signal to the monitor and a brief glimpse of the video card logo, before she died. No beep, though. I disabled L2 cache and tried again, same result. Then I also disabled L1 cache, still same result.
I put the CPU outside for a little while at 35 to 40f. Brought it back in and got a beep this time, but then blank. It looks like the core, at least on this chip, is simply not of a quality high enough to run at 600Mhz without overheating very quickly. It is my opinion that this will be the case with most 400A's. Frankly I'd be surprised if more than 5% will run at 600Mhz without the aid of a Kryotech-type system.