Ok, Since none of the collective have really given you the true straight up answer, here it is.
It is NOT the 32bit vs 64Bit that is an issue. The issue is one of speed and voltage. PCI v2.2 exists in the following forms (this does not include PCI-X or PCI-E) 32bit 33MHz 5 Volt (this is the most common standard PCI) 32bit 66MHz 3.3 Volt (not very common slot wise, but a reasonable number of cards can do it) 64bit 33MHz 5 Volt (A lot of Mac G4 computers used this) 64bit 66Mhz 3.3 Volt (most common server PCI bus, and has been extended to higher speeds with PCI-X) Older athlon MP boards used the 64bit 33MHz 5 volt (Tyan Tiger MP), while newer ones used the 64 bit 66MHz 3.3 Volt (Tyan Tiger MPX). It's all in the cutting of the card, and the blocks in the slot. If the card physically fits, it will run (or the designer should be shot). A 32bit card will run in a 64 bit slot, and 64 bit card will run in a 32 bit slot (I have a number of 3ware cards in 32 bit slots right now). A lot of cards are 3.3volt and 5 volt tolerant, some are not. The Digium quad T1 cards are a good example. The TE405P is 5 Volt ONLY, and the TE410P is 3.3 Volt ONLY. We have a 32bit SCSI card that is 66MHz and 3.3 volt capable, plugged into a 64Bit 66MHz slot on one server. PCI is quite nice in that it's hard to screw up physically. The notches in the card tell you what it can fit into and work with. Slots come in either 3.3Volt or 5 volt. Cards can be cut to be either universal or to be specific voltages A 5 volt only 32bit card will have one notch about 1/2" from the back of the slot (reverse of the back of the case) A universal 32bit card will have two notches cut into it. A universal 64bit card will have three notches cut into it. A 3.3 volt only 64 bit card will have one notch 1/2" from the back of the case, and one notch about 1.5" from the back of the cardslot. A 5 volt only 64 bit card will have two notches separated by about 1/2" Digium has a good page that shows it: http://www.digium.com/index.php?menu=whatpcislot Harry On Thu, 2005-04-21 at 11:45 -0300, Thane Sherrington wrote: > Can one put a 32bit PCI card in a 64 bit slot? From googling it, it looks > like some people have pulled it off, but I'd like to get > confirmation. This is on an IBM IntelliStation Z Pro 6221-ATU > > T > > --- > [This E-mail scanned for viruses by Declude Anti-Virus]
