From: Wynne, Conor (conor_wynne at domain maxtor.com)
Date: Wed 04 Sep 2002 - 15:35:24 IST
Yeah, can't remember the specifics though. A quick google gave me this link
on, of all things, winmag.com ;--)
http://www.winnetmag.com/Articles/Index.cfm?ArticleID=9064
Here is an extract :
PCI cards and slots are keyed by voltage (i.e., 5 volts or 3.3 volts).
Although universal PCI cards are notched for both 5 volts and 3.3 volts, PCI
slot connectors can be keyed for only one voltage. PCI 2.1 and 2.0
specifications permitted both 5-volt and 3.3-volt signaling; PCI 2.2 favored
3.3-volt signaling but also supported 5-volt signaling. (PCI 2.2 cards can
be 5 volt, 3.3 volt, or universal; vendors have designed most PCI 2.2 cards
as universal cards.)
Later
CW
--------------
> PCI 2.2 cards will/are supposed to work in a 2.1 bus
>
> I've used 64Bit cards in a 32bit bus and they work, but obviously slower
there's also voltage differences between pci 2.1 and 2.2, 3.3v vs 5.0 v I
think,
Greg
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