Question about running sli?

[Airbrushkid]

I have a Evga GTX 285 SSC and it runs at 702/1323/1584. my question is do I have to have another GTX 285 running the same exact speed?

[CrashMaster]

nope they just need to be the same family... eg: gtx 285 to a gtx 285 .. but from what I have seen a gtx260 and a gtx260(core216) will work but that may be the only one like that ....