Doubt about AGP graphics CARD

[sou2008]

I am buying XFX 6600GT 128MB GDDR3 AGP CARD

I have some doubt that will it work on my motherboard
My motherboard is Asus P4GE-MX
This motherboard has AGP4x slot

So will this card work on AGP4x as it is a AGP8x card???

[ApPy10]

Yes, it will work. The only thing you have to worry about is if you had an old mobo which only uses 3.3v agp cards. You should be all set, agp is backward compatable as long as the voltages are right. So, good luck, hope that helps. My 6600GT didn't come with anything that said to use it in only an 8x AGP mobo. All of the 6600GTs @ newegg are listed as 4x/8x. Good luck, hope that helps.

[Archibald]

Normally , it should work, if it is compatible with the signalling voltage on the motherboard (1.5v for AGP 1x, 2x and 4x), but it will only work at up to the 4x that your motherboard is capable of. You may need to change your BIOS settings for AGP= 4x to obtain maximum performance from your motherboard and graphics card. AGP 8x cards run at 0.8v but some may permit 1.5v 4x compatibility.

[Dr. V]

AGP Speeds are required to be backwards compatible. This means that an 8X video card MUST be able to run at 4x, 2x, or 1x speeds. However, this does NOT necessarily mean that your 8X card will run on a 4x slot.
Signalling Voltage incompatibility

Because speeds must be backwards compatible, Signalling Voltage is where incompatibilities arise. Basically:

• All 8x cards are 0.8v AGP 3.0 spec
• 8x cards will fit in 1.5V slots, and can tolerate the voltage, but will NOT run properly
• 4x cards can be either 1.5V or 0.8V
• 2x and 1x cards are either 3.3V or 1.5V
• Except in the case of the 8X cards, using the wrong voltage card with the wrong motherboard can result in damage in card and board
• If you install a card of incompatible voltages with the motherboard's specs, the card will NOT run

The connectors on AGP video cards are keyed in such a way that you can only install equipment that have compatible Voltage keyed connectors. Normally the key of the card determines its signal voltage. AGP 1.0 and AGP 2.0 cards using a 1.5V key will signal at 1.5 volts. However, AGP 3.0 devices can tolerate 1.5V - they won't be destroyed, they just might not work properly.

The Bottomline
The bottomline is that your 8X video card can theoretically be safely TESTED in any 1.5V motherboard for compatibility. But if you know for a fact that your board only runs 1.5V AGP 2.0 spec and your 8X AGP 3.0 card runs only 0.8v spec, then the two should NOT be compatible one another. At the very least it will be unstable, if it runs at all. However, we've had a lot of users tell us that their AGP 8x cards work on 4x only motherboards. This is likely due to the fact that some AGP8X video cards are in fact universal 1.5V capable AGP3.0 cards that can run on either 1.5V or 0.8V (remember, AGP speeds are backwards compatible, only voltage incompatibilies cause problems). The other possibility