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CrossFire questions that need answering...

post #1 of 11
Thread Starter 
I was thinking about going for a GPU upgrade, then I wondered whether I should just get another 2nd hand 5850 to go Crossfire instead of something like a 5870 or GTX570. The problem is I can play BC2... but not quite at max. When i'm using 8x AA it starts to slow down a bit, so I want to cure that.

Questions:

What is the performance of 2 x 5850's equivalent to?

Do all games support Crossfire?

When overclocking, do you overclock each card separately?

Is this move relatively safe for another year or so?

Are there any disadvantages of Crossfire other than heat/power consumption?

Is this a good idea...?
Edited by 98uk - 12/19/10 at 8:31am
post #2 of 11
Do you need or notice a difference in the upped AA? AA sucks VRAM and many games can run out a 1GB card even at 1680x1050.

While in benchmarks crossfire'd cards tend to perform better if not a great deal....in reality, the experience of lots of folks is that 40FPS off one card looks much better and give much smoother gameplay than 40FPS off crossfired cards.
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post #3 of 11
Thread Starter 
Well, it's just that BC2 works great at all high in DX11 @ 1920x1080, but as soon as you apply more than say 2x AA, it starts to get a little jumpy which I guess means it doesn't quite have the power in the tank.

Would crossfire remedy this situation?
post #4 of 11
Quote:
Originally Posted by alex98uk View Post
Well, it's just that BC2 works great at all high in DX11 @ 1920x1080, but as soon as you apply more than say 2x AA, it starts to get a little jumpy which I guess means it doesn't quite have the power in the tank.

Would crossfire remedy this situation?
It would probably remedy that...but in exchange you could well get mico-stutter and other graphical annoyances. TANSTAAFL. It happens on both SLi and Crossfire, so it sin't just an ATi drivers thing.
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post #5 of 11
i have put answers/opinions in bold

Quote:
Originally Posted by alex98uk View Post
I was thinking about going for a GPU upgrade, then I wondered whether I should just get another 2nd hand 5850 to go Crossfire instead of something like a 5870 or GTX570. The problem is I can play BC2... but not quite at max. When i'm using 8x AA it starts to slow down a bit, so I want to cure that.

Questions:

What is the performance of 2 x 5850's equivalent to?
you get 73% scaling at 1920*1200

Do all games support Crossfire?
most games support crossfire and at least scale decently (50%). it would be very nice to know what resolution you are playing at
When overclocking, do you overclock each card separately?
although you can overclock them separately, it is generally advised to overclock both at the same time to reduce microstuttering, a negative feature of using multiple gpus
Is this move relatively safe for another year or so?

Are there any disadvantages of Crossfire other than heat/power consumption?
driver issues. amd makes bad drivers. with crossfire, it becomes horrid. i recommend getting 10.4 drivers.
Is this a good idea...?
not really. i recommend you sell our 5850 for as much as you can and look at a 6950
hope i helped
Hehe xD
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Hehe xD
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post #6 of 11
Quote:
Originally Posted by alex98uk View Post
When i'm using 8x AA it starts to slow down a bit, so I want to cure that.
Crossfire mirrors the memory instead of adding it. If you want more AA you should sell your card and get a 2G 6950.
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post #7 of 11
Thread Starter 
Hmm, seems like the advice is to stick to a single GPU. The only issue is, new generation GPU's usually cost too much :/
post #8 of 11
Quote:
Originally Posted by alex98uk View Post
I was thinking about going for a GPU upgrade, then I wondered whether I should just get another 2nd hand 5850 to go Crossfire instead of something like a 5870 or GTX570. The problem is I can play BC2... but not quite at max. When i'm using 8x AA it starts to slow down a bit, so I want to cure that.

Questions:

What is the performance of 2 x 5850's equivalent to?

Do all games support Crossfire?

When overclocking, do you overclock each card separately?

Is this move relatively safe for another year or so?

Are there any disadvantages of Crossfire other than heat/power consumption?

Is this a good idea...?
2 x 5850 = 5970. The 5970 is two 5870's run at 5850 speed.

Not all games work with CF, but many do.

You can have driver issues but I am running CF with 5870/5850 no problem as many did. I bet if you have enough power, dont overclock too high, you will be fine.

I think this is a great option with the current cards avaiable and pricing.
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post #9 of 11
Quote:
Originally Posted by alex98uk View Post
Hmm, seems like the advice is to stick to a single GPU. The only issue is, new generation GPU's usually cost too much :/
not if you can get a decent price on a used card.
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by Gabe63 View Post
not if you can get a decent price on a used card.
But, there usually aren't many new generation cards already for sale used. If there is, i'd be inclined to say something was wrong.
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