Stupid Question

Posted on 2004-03-30
Last Modified: 2013-11-09
Can you plug in a PCI-X card into a standard PCI slot.  The Card appears to be longer than the standard slot.

Question by:ciooal
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Expert Comment

ID: 10719519
no you cannot. you need a pci-x slot to do this.
Sorry for ya, but PCI-X is an up and coming technology, so just wait for it, it'll come ^_^
LVL 69

Expert Comment

ID: 10720260
That is not true.  PCI-X cards will fit in PCI slots; they just won't operate at higher bandwidth than PCI.  PCI bandwidth is 532MB/sec max, PCI-X bandwidth is 1.06GB/sec max.,,sid1_gci213746,00.html

Author Comment

ID: 10722064
I saw on a web site that you can plug them in and they will "just hang over" the extra bit that is a 64 bit PCI vs a 32 bit PCI.  Has anyone done this?  I have several older Dell Poweredge 2450's that I must upgrade to 1 Gb/s NICs and all I see available are the larger PCI-X 64 bit NICs and all I have are the smaller 32 bit PCI slots.  Just strikes me as odd.

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LVL 69

Expert Comment

ID: 10723574
Take a look at the link I posted, it says the cards are physically compatible as far as fitting the regular PCI slot.

Accepted Solution

wadegiles earned 50 total points
ID: 10726154
Tony Pierce, one of the guys, that developed PCI-X was a guest on The Screen Savers (TechTV).  In the interview, he stated explicitely that PCI-X cards were backwards compatible with PCI slots.

And in another section of the TV show's website:,24330,2428549,00.html


Expert Comment

ID: 10729090
Oh and it isn't a stupid question.  Regarding PCI-X and PCI-Express, they are different technologies.  PCI-X is backwards compatible, whereas PCI Express is NOT.  PCI-X, like PCI, is a serial bus.  PCI Express is a parallel bus.  Just more FYI.

Expert Comment

ID: 10737080
That's what it was, I was thinking of PCI-Express, heh, sorry bout that!

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