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New to crossfire

post #1 of 16
Thread Starter 
I purchased a Sapphire 5850 last year, after selling my GTX 280. I bought it with CF in mind, and I my mobo supports x8/x8 which is fine for them. My first question, is what can I expect from it? I've done a lot of reading and seen very mixed reviews. I am aware it will run hotter, and draw more power, but what can I expect out of ATI's drivers for CF on the 5xxx series? Everything I've read suggests my 650W Corsair should hold up, so I'm good there. Now...can I mix and match? I really like my Vapor-X, but if I can't find one and am forced to buy an ASUS or something will it hurt the performance?

Edit: Resolution will be 1920x1080 where applicable, maxed settings and I'm hoping for X4 AA and X8 AF. Dual monitors may also be a possibility in the future.
Edited by Silvos00 - 3/22/11 at 10:08am
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post #2 of 16
You can oc the cards to match the vapor-x clocks. So yeah mix and match is fine.


Drivers are fine.
post #3 of 16
Drivers have been good to me and my 5870's i'm using 10.7 at the moment and they seem to work best. I had issues with the newer ones.
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post #4 of 16
You can...you can even use a 5870, just that it would downclock to 5850's specs.
post #5 of 16
You should notice a significant improvement in games that utilize CF. Heat will be your main concern as you are aware of.

Like Chief said, you can OC the lesser clocked card to match the other or the faster card will downclock to match the slower cards speed.
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post #6 of 16
Thread Starter 
Seems like a waste to buy a 5870 though if it would downclock. I plan on OC'ing them to 909/1218 anyway, but my hope was that having 2 Vapor-X would keep heat increase to a minimum.

Edit: The games I have now are SC2, The Witcher, And FFXIV. Planning on adding Crysis 2 and a few other titles. The only game that has strained this rig so far is FFXIV with AO turned on, or cranking up the AA on the Witcher (gave me 1.5 fps)
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post #7 of 16
Nothing has come close to stopping my 5870's even at 8xaa @ 1080p. I'm sure 5850's won't be far behind.
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post #8 of 16
Thread Starter 
Ya, I turned the Witcher AA up to like 32 >.>; it wasn't pretty(Well it was pretty...but 1.5 fps ugh). How does your 750W Corsair like the Crossfire cards? Still plenty of headroom?
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post #9 of 16
I Just bought an Asus 5850 that should be coming through my door any minute now...
I plan on CF my system as well and everyone says my PSU is top quality so I have no problem. I will be OCing my card as much as possible on stock volts so around how much will the clocks be at??
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post #10 of 16
Thread Starter 
I'm aiming at 909/1218 in demanding games if need be, but I'm hoping I can dial it back a bit to 850/1100.
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Green Dragon
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