Will an 8x AGP video card work in a 4x AGP slot?

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It will 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.

Those folks experiencing problems with 8x cards in 4x slots might consider the possibility of power supply issues. It's not unusual to see newer cards requiring 300-350 watt power supplies with specific voltages requiring up to 18 amps.

Many old Dells and others have only 250 watt supplies, and the new dual gizmo gazillion megahertz screamers take a lot more juice than the factory-supplied cards.

Maybe

Some 8x cards are designed to be able to clock down to 4x, some are not. Many times it will say whether or not this is possible right on the box. In all respects the motherboard or 8x card should not be damaged by attempting this, the worst that will happen is it wont work.

First answer by ID2614564098. Last edit by Chewd. Contributor trust: 82 [recommend contributor]. Question popularity: 434 [recommend question]

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