Graphics Mixing cards for SLI.

I was thinking of getting a cheap gtx280 off ebay to have a sli setup.
DX11 isn't really that important to me just yet.

Was wondering how a factory overclocked card would sit matched with my stock clocks card.
Would it just default back to the stock clocks on the factory oc card?
Would there be any bios flashing needed?

 

Pretty sure the faster card would just run at a slower speed same as the slower card it SLI with.

 

That's what i thought, but i would like some confirmation from anybody who has actually done this.

Was thinking the factory oc cards may have a different bios version and need me to flash em to match.

 

I use to run a bfg 260 oc2 with just a bfg 260 stock. The oc2 just clocked Down to stock speeds. Sli and crossfire always work to the slowest card.

I ended up overclocking both cards to the oc2 level as I guessed they'd both run at that speed, which they did

 

Hmm; i might have to get my 285xxx a partner. I held off as i thought it would cause all sorts of issues with a stock 285. Cheers for the info.

 

I can confirm that the only requirement is the the same GPU, I've run several mixed speed combinations in SLi.

As far as the OP goes, GTX280 SLi is a VERY fast gaming rig.