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Will a new AGP 8X video card work in a 4X AGP Slot?

Posted on 2004-10-28
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Last Modified: 2013-11-08
Hi

My PC (Pentium 4 2.8GHz) has an Abit mobo with an AGP 4X slot. Can I fit a modern AGP 8X card in here? (e.g. nVidia 5900). Will it work (albeit a little slower) or are the voltages wrong and it will blow up to a million pieces?

Thanks
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Question by:cazzer
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    Expert Comment

    by:Callandor
    Take a look at your AGP slot, and compare it to the AGP card you are interested in.  If the notches match, they are voltage compatible.

    AGP key voltage
    http://www.ertyu.org/~steven_nikkel/agpcompatibility.html
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    Author Comment

    by:cazzer
    Thanks Callandor

    Not quite clear though - it implies that an AGP 8X card has to run in an AGP 3.0 slot, capable of supplying 0.8v signalling voltage. An AGP 3.0 slot is identified by having only a 1.5v key - but so does an AGP 1.5 slot!

    Nevertheless, now I know that I need to have an AGP 3.0 slot, I can type my mobo part number is Abit's website and get the exact details. Thanks for your help.
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    Expert Comment

    by:Callandor
    Don't get your hopes too high about AGP8X being significantly better than 4X - cards don't use enough bandwidth for this to make a difference: http://www.techreport.com/reviews/2002q4/gf4-8x/index.x?pg=6
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    by:cazzer
    But the card I have is only a Geforce 4MX, so a new card will give a big boost. Just looked at the mobo diagnostics which tells me the AGP is version 2.0. Now I'm even more confused as the website you gave doesn't mention AGP 2.0!
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    Expert Comment

    by:Gaud-wo
    Bit more graphical explanation to difference (and new assimilation data for Callandor ;) ):
    http://www.directron.com/15agpguide.html

    A AGP 8x card has to run in a slot that provides 0.8v signaling. Whether it's 4x or 8x, it just has to provide 0.8v. That's it.

    8x doesn't have that much performance gain over 4x anyway, and PCI-X doesn't have that much performance gain over AGP - it's all about other bottlenecks.
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    Expert Comment

    by:Gaud-wo
    Hm, it's closing time at work, so busy saying goodbye that I forgot to click "submit" :p What mainboard have you got, cazzer? You can look on the Mfg's website for tech details for your mainboard, it will list what it's compliant with.
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    Expert Comment

    by:Callandor
    I was going to post this link: http://www.ati.com/support/faq/agpchart.html, but since Glenn provided the other one, in it goes into the assimilator ...
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    Expert Comment

    by:Gaud-wo
    Hey, I've just been on that site too. Came up as first hit on Google :p
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    Expert Comment

    by:Gaud-wo
    Anyway, I'm going home, continue building my new AMD64 system. Hope I can finish it any time soon - can do most stuff in Win by now, so I should be able to check here in an hour or so. Got a question too, don't remember what - it's in a mail and outlook is already closed :p
    I forget way too much, outlook & PDA are my best tech buddies :p
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    Author Comment

    by:cazzer
    My mobo is an AOpen AX4GER. The website just says AGP 4X (no mention of voltages) but the website at ATI suggests that my mobo won't supply 0.8V and therefore I can't run a modern video card. :-(

    Upgrade time again...
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    Expert Comment

    by:Jimmy53
    Here are the system requirements for a 5900.

    Pentium® 4, AMD® Athlon® or compatible CPU
    32MB system memory
    *** AGP 2X or AGP 2X/4X or AGP 8X universal slot ***
    Installation software requires CD-ROM drive
    DVD playback requires DVD drive

    You can upgrade as long as you have the AGP 2.0 or later type slot.

    Enjoy.
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    Author Comment

    by:cazzer
    Hey Thanks Jimmy! Seems to be a bit of conflicting advice, but I have an AGP 2.0 slot for sure. Try it I guess...
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    Accepted Solution

    by:
    An 8X card that requires 0.8v signalling is also supported on a 1.5v slot: http://www.soyousa.com/kb/kbdesc.php?id=146
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    Assisted Solution

    by:Jimmy53
    The reason I think it will work was because all AGP 4X slot's are 2.0 (some might be 3.0 but I don't think I have heard of that).  As far as I know all 1X and SOME 2X are AGP 1.0.  These last generation AGP cards were all compatable with AGP 2.0 and since you have 4X that means you have AGP 2.0.
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    Author Comment

    by:cazzer
    Thanks guys.
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    Expert Comment

    by:ptellini
    The modern agp 8x video card should work fine it just will be slowed to 4x.
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    Expert Comment

    by:Gaud-wo
    And since there is almost no speed increase when going from 4x to 8x, you shouldn't see any slowdowns!
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    Expert Comment

    by:KenO1964
    Just an additional note, I had an ASUS A7N266-E with a 4X AGP slot that would not allow an 8X AGP card to work properly.  ANY, 8X AGP card..  I sent it back to ASUS and they claimed the board was fine, and it must've been the 8X card I tried.  (I tried 4 completely different cards.)
    Your mileage may vary of course, but in that instance, an 8X card would not work on a 4X board.
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    Expert Comment

    by:v-2bmarr
    As long as your board's AGP slot isnt notched against installing a card it will work... BTW please dissreguard the comment about 8x not being much faster than 4x that may be true of SIS xaber cards and some low end ATI and NVIDIA MX cards but the technology is in place .... its just a matter of whether or not the card you get can use it. Im running Tribes vengeance on a 4x Radeon 9100 in an 8x slot and im not complaining.

    Happy Fragging!!!
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    Expert Comment

    by:Gaud-wo
    The extra bandwith available in 8x is currently not used, this is a technical limitation.
    You just said it yourself, you run at 4x agp and you're not complaining... This proves the opposite of what you claim??
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