On May 18, 2004, at 05:19 pm, J.S. Garrison wrote:
I'm running a Diimo 68030/50 in a IIci. It does a good job of pepping it up
without the problems you're describing.
The airflow in a IIsi and IIci are dramatically better than the SE/30 - especially as the SE/30's fan is on the opposite side of the case to the expansion slot.
The thread's lost to me but if you're using the right adapter and it has the
FPU removed, then you should not have the problems you're having, and should
not need any circulation of air.
50MHz 68030s get really very hot - as hot if not hotter than 40MHz 040s. Having applied a coat of thinking since my last post I think it's possibly in about the worst place foe ventilation in the SE/30 as it's close to the tube (one of the biggest heat generators in there), the hard disk (which is 7200rpm and alsolikely gets really hot) and away out of the main airflow - which run in at front/bottom, along the logic board, and up the back of the drive bays, then out of the fan via the analogue board.
I must admit I've had the best luck in acceleration on SE/30's by using a
Daystar 040. That, too comes with it's own brand of trials and tribs but the
experience is a kick.
CPU on that card has a heatsink. I dunno how the PDS adapter is the card height-wise but my guess is the airflow up the expansion area isn't that bad to about halfway up the case, after that it will start to shift away to the other side where the fan is.
Two bottlenecks occur in the case of acceleration. The hard drive and the
RAM. Maybe go at it from these angles, first?
The Hard Drive is 7200rpm according to Tim, and so outstrips the SCSI bus by several magnitudes. Slow (read 80ns) RAM could be a problem however on a card that fast.
-- Mark Benson
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