SLI and Memory speed

[not1germ]

I was wondering if memory speed means something for SLI?

I know that you got to have the same Card/GPU - but what about the memory size and speed?

Can you run a 8600GT 320mb with a 8600GTS 640mb?

What about different speeds:

Evga 8600 GTS Superclocked - core clockspeed of 720MHz and 2.1GHz memory
XFX 8600 GTS XXX – core clockspeed of 730MHz and 2.26Ghz memory

Could I put the eVGA and XFX cards as a pair, even though the XFX is faster?

How would this effect performance?

 

[RogueTrip]

yep, they can run together but will only see 320mb and run on the speed of the slower card (or both will run at EVGA's speed).