Is agp 8 backward compatable to agp 4?

Posted on 2007-10-15
Last Modified: 2013-11-08
Is agp 8 backward compatable to agp 4?
Question by:worded
    LVL 5

    Expert Comment


    yes it is ... but your AGP 8x card will run as AGP 4x
    LVL 13

    Expert Comment

    Hello worded,

    In a word, yes. An AGP 8 will work on a motherboard for AGP 4, I have used it myself back when AGP 4's became hard to find. It was still working after 5 years when I donated the PC to a school.

    It will still read as an AGP 4, but will work for any OS up to Vista, I have not tried it on a motherboard running Vista, I am running 2 PCI-E16x nVidia 8800's.
    LVL 87

    Expert Comment

    Depends what you mean with backward compatibility. You can't connect an agp8 adapter to a mainboard which only supports agp4, but you can connect an agp4 adapter to an agp8 mainboard.
    LVL 42

    Accepted Solution

    AGP 3.0 is the standard for both 4X and 8X so, yes, any conforming 4x card ought to work in an 8x slot and vice versa.
    More info:
    LVL 26

    Expert Comment

    Maybe. If you're talking about putting an AGP 8 card in an AGP 4 slot, it might work, but there could be voltage or performance problems. AGP 8 works on 0.8 volts signal, while AGP 4X and 2X work on 1.5 volts signal. If  the AGP 8 can handle the additional voltage, it should be OK. Also, the card will only run at the speed of the AGP 4 slot it was in. A more definitive answer would depend on the specific AGP 8 card and motherboard in question.
    LVL 2

    Expert Comment

    This link should answer most of your questions

    I have never seen it not work. It will just clock back to x4

    What video card do you have?


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