Video Cards

Steve Alligood steve at
Tue Mar 12 13:43:36 MDT 2013

newer slots are backwards compatible (1.0 card in a 2.0 slot) but often not forward compatible (2.0 card in a 1.0 slot) even with firmware, as the chipset needs to support the newer speeds and protocol changes.  Of course, some cards will also negotiate and slow themselves down to what the slot will handle (2.0 card pretending to be a 1.0 card in a 1.0 slot).

It all depends on the hardware, and in general the cheap hardware doesn't always play that nice.


On Mar 12, 2013, at 12:56 PM, Matt Melvin wrote:

> On Tue, Mar 12, 2013 at 10:58 AM, Daniel Fussell <dfussell at> wrote:
>> Thanks, good to know.  I'd wondered about that when I first started
>> looking.  The materials I found at the time gave me the impression that
>> newer slots could support older cards, but the reverse was not
>> necessarily true.
> In my personal experience, I have run into this; an older Athlon 64
> board with a PCI-E 1.0 slot wouldn't accept a PCI-E 2.0 card.  I don't
> know if this is always the case, but I wanted to let you know that
> I've seen it in person.  Since the slots are physically identical, it
> seems like this issue might be solved with motherboard firmware
> updates, but I couldn't even explore that option, as the board was an
> Epox and they went under not long after I bought it.

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