SLI Question - Superclocked and normal?

[Hathaway]

I bought the EVGA GTX 460 Superclocked 1GB from overclockers a while back, and I've been contemplating getting another for SLI.
My question is, does the other card need to be the superclocked version as well, or will the standard one suffice? Are there any significant drawbacks to doing so? In fact does it even need to be an EVGA card, can it be another manufacturer's 1GB GTX 460?

Also, I noticed it's no longer stocked here, anyone know if it's coming back?

 

[cyber69]

As it's an old model then I doubt OCuK will be getting any more stock. You could try locating one on an auction site

 

[Cleeecooo]

They're EOL.
just order directly from EVGA.

Edit. Does that count as a competitor?

 

[lazypnk]

You can pair up different models ala stock clock or factory oc and company brands, I say downclock or oc ether card to match up not sure if that will be a problem but ya never know. Sorry about slang I'm lazy on my phone