Bij Overclocker Australia staat een heftig artikel online van een gast die zijn Celeron 366 watergekoeld op 643MHz heeft draaien (117FSB).
I ran the CPU at 2.2v because that was what it needed with the peltier by itself. As I've already said, it would boot 98 at 616MHz but would crash pretty soon thereafter. Also, due to my dodgy Maxtor hard drive, I had to turn off UDMA because it didn't like the overclocked PCI bus at 616MHz. So, I filled the bucket with water, let the pump run for a minute or so (to make sure the water-jacket was nice and cold) then cranked it up at 616MHz. It booted as expected, and cruised happily along for about 30 minutes of Unreal flyby+SETI before crashing, by which time the mobo temp sensor was reporting 37C. I put my hand into the bucket of water and it was quite warm.
Never satisfied with what I have, I put some fresh cold tapwater into the bucket and tried for 117MHz FSB, which is 643MHz core speed. The great thing about this speed is that the AOpen AX6BC-Pro has 2 options for your PCI speed at that FSB speed - one of which is 29.75MHz! This means the PCI is actually underclocked, which let me turn the UDMA back on for my hard disk. To my surprise it booted, loaded Unreal, ran fine for about 20 minutes until crashing with a bucket of very warm water as before.
Needless to say, I liked the taste of this speed. To prove it was really the heat and not the CPU just failing to cope with the speed, I got another bucket of fresh water and put 2 trays of ice-cubes into it. This ran at 643 for almost an hour, until the ice-cubes melted, the water heated way up and bang.. you get the picture. During that hour I unzipped files, ran Prime95, SETI@Home, the Unreal flyby, played some Sports Car GT, copied a 288mb file from one directory to another and did a File Compare on them.. all fine. No errors. No crashes. Woo!
119MHz FSB, or 670MHz core, was a no-go. Locked up at the Win98 login screen, even at 2.4v with UDMA turned off.
Nadeeltje is dus dat als zijn emmertje water warm wordt het zaakie crasht