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

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

Yes. :iagree:

BTDT, Michael

[QUOTE=pankusareen;2563554]Will an AGP 8x card work in a 4x interface slot?[/QUOTE]

Yes it will just that it will run at 4x not 8x as the rated AGP card is. Also that AGP might need a 4 plug molex for extra power so you should make sure your PS has a extra power plug for the AGP card…

^ fortunately there were only a few cards that needed additional power feed :wink:


Pretty sure my 3870x2 needs 2 additional feeds to work, or at least one of them needs to be a 6 pin PCI video feed. I had to get a adapter to make one of the extra 4 pin ones work for it. It did work but you couldn’t activate any of the extra features like overclocking when it only had the 4 pin connector hooked up.

one more question what about agp2 video card on agp8 slot will it work?

AGP cards are backward and forward compatible within limits. 1.5 V-only keyed cards will not go into 3.3 V slots and vice versa, though “Universal” slots exist which accept either type of card. AGP Pro cards will not fit into standard slots, but standard AGP cards will work in a Pro slot. Some cards, like Nvidia’s GeForce 6 series (except the 6200) or ATI’s Radeon X800 series, only have keys for 1.5 V to prevent them from being installed in older mainboards without 1.5 V support. Some of the last modern cards with 3.3 V support were the Nvidia GeForce FX series (FX 5200, FX 5500, FX 5700, some FX 5800, FX 5900 and some FX 5950) and the ATI Radeon 9500/9700/9800(R350) (but not 9600/9800(R360)). Some Geforce 6200 cards will function with AGP 1.0 (3.3v) slots.

It is important to check voltage compatibility as some cards incorrectly have dual notches and some motherboards incorrectly have fully open slots. Furthermore, some poorly designed older 3.3 V cards incorrectly have the 1.5 V key. Inserting a card into a slot that does not support the correct signaling voltage may cause damage.

Motherboard slots with both 3.3 V and 1.5 V keys do not exist.

There are some proprietary exceptions to this rule. For example, Apple Power Macintosh computers with the Apple Display Connector (ADC) have an extra connector which delivers power to the attached display. Additionally, moving cards between computers of various CPU architectures may not work due to firmware issues.

For more information see Wikipedia.