5770 Crossfire PSU requirement

[skeletonw00t]

I have a 5770 and a Q6600 clocked at 3ghz, 4 gig ram, 2 1TB hdd's ... I was tihnking maybe in 6 months ill buy another 5770 to crun in CF...

I currently have a corsair 620w modular psu - will that be enough to run two cards in CF comfortably?

On the box it says 600watt recomended for CF but obviously you can never really trust the boxres 100% so does any1 have any additional info/experiences?

Ta

 

[xGaffner]

550W Corsair would run that perfectly.

 

[Owenb]

620watt is more than enough. The 5770 peaks 108watts so Xfire will only use 15% more than a single 5870. A good 500watt would be plenty, let alone a 620watt psu.

 

[skeletonw00t]

Wicked cheers,

Does any1 know if the two cards need to be the same brand or is just the same model of card ok?

 

[Owenb]

Wicked cheers,

Does any1 know if the two cards need to be the same brand or is just the same model of card ok?

It will work fine. Very often different brands are just different stickers!

 

[Shakeel]

different brands work fine it only when you use different speeds you may have an issue

 

[skeletonw00t]

How do you mean? Different clock speeds? Mine is overclocked at the moment - i would just need to reset it to stock speeds when i add another card yes?

 

[Owenb]

How do you mean? Different clock speeds? Mine is overclocked at the moment - i would just need to reset it to stock speeds when i add another card yes?

Usually the cards run at the speed of the slowest card, I assume it is the same for OC'ed cards.