Mac II Video cards and power

[Phil Beesley]

Jeff W's and Mark B's comments on NuBus video cards reminded me of a 
discussion on another forum. I have a SuperMac Spectrum 24 V in my IIci 
that works pretty well for my limited graphics demands. However the 
card is labelled as requiring 12V @ 2A and 5V @ 2.5A while the psu is 
labelled as delivering just 12V @ 2.5A. In addition to the video card I 
have a 68030 accelerator, ethernet and video image grabber so according 
to the labels my IIci should be marginal on power stability. (My psu is 
a UK model but the US model has similar outputs.)

In practice I've never had a glitch and the psu never gets hot. I 
suspect that the IIci psu specs are fairly conservative. The IIci is 
such a well designed piece of kit (possibly not quite as well 
engineered as the II, IIx and IIfx) that I have no concerns. However 
for the cheaper IIsi, I'd definitely check the power draw before 
fitting a beefy graphics card.

Phil
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