Best 5770 for CF?

[ExcaliburMM]

Sup GFX section.

Looking to CF a pair of 5770s, and ran into some criteria and questions:

Which 5770s support voltage adjustments?
Which 5770s have coolers that either blow out the back or are good enough that they won't mind sitting next to each other?

I've seen things like the Hawk, the CuCore, and they look nice and appear to be what I'm looking for, but I wanted to double check rather than buy one and find out I can't adjust the voltage or sitting it next to a second card makes it heat up too much.

Case airflow should be fine, going to have a 250mm blowing on them.

All help appreciated.

 

[Termie]

Sapphire Vapor-X is also very good and very quiet. Not sure about voltage adjustment, but this review says it overclocks even better than the Hawk: http://www.techpowerup.com/reviews/Sapphire/HD_5770_Vapor-X/33.html.

None of the custom coolers push hot air out of the case. Only the original 5800-style cooler did so, but it didn't keep the cards as cool, according to Anandtech.

 

[poohbear]

i have the vapor-x and its whisper quiet. Can't hear it over my other fans. Definitly get that for crossfire. Just make sure the game u like supports xfire as some games dont benefit from em. maybe w/ more mature drivers?

btw overclocking these things doesnt show any increase in performance, atleast for me. pushed it to 940/1400 from 860/1200 and didnt notice a thing in my favorite games, some benchmarks showed a measly 3-5 fps increase, but its not like that's noticeable.

 

[hans030390]

i have the vapor-x and its whisper quiet. Can't hear it over my other fans. Definitly get that for crossfire. Just make sure the game u like supports xfire as some games dont benefit from em. maybe w/ more mature drivers?

btw overclocking these things doesnt show any increase in performance, atleast for me. pushed it to 940/1400 from 860/1200 and didnt notice a thing in my favorite games, some benchmarks showed a measly 3-5 fps increase, but its not like that's noticeable.

If you're not seeing better results, your card is going through memory error checking. Basically, it's not stable, so you'll have to increase the voltage to see performance gains. Eventually you'll stop getting gains no matter how high you up the voltage. At this point the card is stable.

 

[Dark4ng3l]

Yeah as Hans said the card might be stable at high ram speeds but you need to tone it down because the card will start slowing before reaching the point where it makes the card unstable.

And I have a MSI HAWK and I don't see how it could be possible for vapor-x cards that can't be voltage tweaked to overclock better than what my card can do at 1.35v.