Difference in GPU brands?

[regulus]

So I decided to hold on to the 5870 a bit longer and spice it up with Xfire. I have a 5870 Gigabyte. I'm about to buy an Asus 5870 from Jobe in the MM. I think I know the answer to this but I thought I'd ask the bright minds in this section of the forum;

Does it matter if the brands are difference in Xfire? Did some light Googling and some say yes, more says no.

What say OCUK? Does any 5870 work with any 5870 in Xfire?

 

[regulus]

Can you just clarify what you mean with GPU

 

[regulus]

Does games to scale well with Xfire or are there a few dogs out there (such as Crysis I've heard) that doesn't like it?

 

[regulus]

On thing I forgot to ask. What's the minimum PSU I can get away with here. I got a 600 but meaning to upgrade anyway to something more lasting. However, for the very immediate future, would this work on a 600w?

 

[regulus]

Really? No way, thought it was way too low. Everywhere I read says it's too low.

I got a OCZ ModXStream Pro 600w, rest of specs as follow;

965 BE which I'll run at stock to help keep the volts down
Crosshair iii
4 gig RAM at stock.
1 HDD

and then the 5870 XF.

You sure 600 is enough for the moment?

 

[regulus]

Well, according to the Thermaltake PSU calculator I need around 550w. Looks like if I take out my DVD/CD ROM drive (who still uses those?) it brings it down to the low 500's. Doesn't look like heavy PC overclocks make much of a difference on the PSU either.