Tom's Hardware > Forum > Graphic & Displays > ATI > Compatability of AGPx2 card in AGPx4 slot

Compatability of AGPx2 card in AGPx4 slot

Forum Graphic & Displays : ATI - Compatability of AGPx2 card in AGPx4 slot

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John Dack   11-12-2008 at 10:27:43 PM

I am considering installing an old ATI All-in-Wonder 128 AGPx2 card in an AGPx4 slot. Can anyone tell me if I am liable to blow the board or AGP socket or will it just run at AGPx2 speed. The board is a D1214 in a Fujitsu Siemens Scenic T and has an Intel 815e chipset. Any help would be greatly appreciated.

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Bronze Graphics badge coozie7   11-12-2008 at 10:36:50 PM
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Should be no problems with speeds, AGP, like PCI-E is backwards compatable (old stuff works on newer stuff)
Just one point check the AGP voltages, can`t remember the numbers off the top of my head but there are two and they are NOT compatable.
You may have to do a bit of Googling on this point and I`m probably being overcautious since I think the lower voltage only applies to the first AGP cards and slots...But you never know.

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John Dack   11-12-2008 at 10:46:52 PM
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Thanks very much. The voltages are 1.5v and3.3v. I am unable to determine the voltage of my card and of the AGPx4 slot.

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Bronze Graphics badge coozie7   11-12-2008 at 11:00:11 PM
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Been off to check Wikipedia. The AGP 2X uses 3.3V while the AGP 4X uses 1.5v and it also states that in most cases motherboards and cards are keyed to prevent a mismatch but warns that not everyone followed the rules:(
My advice is, no, do n`t do it.

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John Dack   11-12-2008 at 11:10:07 PM
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Thanks. I will take your advice and give it all some more thought.

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bobbknight   11-12-2008 at 11:29:48 PM
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check the voltage in bios.

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cyber_jockey   11-13-2008 at 12:00:40 AM
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Its a small mission to get a agp x4 motherboard let alone x2 on the market. Right now my even my 11 month old PCI-E 1.0 x16 motherboard is dead.

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4745454b   11-13-2008 at 12:21:41 AM
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If its an 8x/4x slot, it won't work. If its an 4x/2x slot, your fine. Either way, they are notched differently, and the one won't fit in the other. If it fits, it will work.

------------------------------ The voice of REASON
Do NOT feed the TROLLS!
Always a DEMON!
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John Dack   11-13-2008 at 03:33:49 PM
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Thanks that is useful to know. My card appears to fit in the slot so assume it must be a Universal x4 slot.

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