The brand can be different and even the clocks but it is recommended to find a card with the same amount of Vram and type like dd2 or dd3. If your current card is a dd2 then look for a dd2 if not same concept.
ya true and true again but my gtx 260 messed up.. my ati 4870 warped due to water cooling block messing up and a gtx 260 inno3d set on fire! so i went whats the point in spending loads? so i just got a 4670 for £40 lol