Graphic Cards?!

[thekeelings]

Hi.

I want to buy a new graphics card but i'm a little unsure about something! I want a nvidia 5600 fx 256mb ddr card but it says 8x on ebay! My motherboard is only 2x and 4x! I emailed most of the people asking about it and the people who replied say it will work! I dont want to spend £100+ on a card that might not work can anyone help me understand? O yeah whats best? A nvidia fx 5600/5700 or radeon 9600 pro?

Cheers
Lee