I have a v4-ish i-Opener (doesn't seem quite a v4 but did come with a Rise CPU). I am planning to put in a K6-3+ at 400MHz once I figure out the necessary mods (the standard v4 directions don't quite apply, and there is no SW4). In the meantime I wanted to get WinXP running, and WinXP setup won't work with Rise CPU. So I got a 2.8v 200MHz Pentium MMX chip and dropped that in. I have a Lasagna fan installed as well.
The IO runs for about 30 or so minutes and then starts rebooting (or occasionally just freezing). I've eliminated memory as the cause (tried different 128Mb and 256Mb Sendo sticks, which pass MemCheck86 in a laptop). If I put the Rise processor back in things seem to work fine (with FreeBSD doing a "make world"). I've tried a P166 overclocked as well, and it also does the rebooting. Because FreeBSD runs fine with the Rise chip, and I know the Pentium chips work in desktop machines, I can only conclude that they are overheating.
So my question is: has anyone else experienced this? Just how capable is a Lasagna fan of cooling? It sounds like everyone seems to use them, but I'm starting to lose confidence that it will work for cooling the AMD chip.
BTW I have the RF shield removed and even cut a 2" square hole out of the plastic case to make sure air flow was not an issue.