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silly question

marky g

marky g

marky g

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when crossfiring do you always have to use the same cards.
MSI P55A FUZION Motherboard LGA1156 review says you can use 2 differant types of cards dumb question but
 
Brand doesn't matter. You can crossfire, say, two 6870s from different brands.

You can crossfire cards (although only from the same series I think?) that are different. However, the more powerful one will only perform as well as the weaker one, if that makes any sense.

Basically, if you crossfire a 5450 and a 5770 you'd get the effective performance of two 5450s.
 
Unfortunately Daichin, some of what you say is incorrect.

When using Crossfire, the GPU family is the important bit, and these must match (eg 69XX OR 68XX) so you can crossfire any 6970 with any 6970 or 6950, or 6870 with any 6870 or 6850, and brand does not matter. The cards will run at their own speeds, so a 6970 crossfired with a 6950 will run at 6970 speeds while the 6950 runs at 6950 speeds.

Just guessing here as I have no experience with unmatched cards but I would assume the experience would be smoother with matched speeds on the same type of card (2x6970 or 2x6950 at the same speeds), but don't take that as a given.
 
richytractor said:
Unfortunately Daichin, some of what you say is incorrect.

When using Crossfire, the GPU family is the important bit, and these must match (eg 69XX OR 68XX) so you can crossfire any 6970 with any 6970 or 6950, or 6870 with any 6870 or 6850, and brand does not matter. The cards will run at their own speeds, so a 6970 crossfired with a 6950 will run at 6970 speeds while the 6950 runs at 6950 speeds.

Just guessing here as I have no experience with unmatched cards but I would assume the experience would be smoother with matched speeds on the same type of card (2x6970 or 2x6950 at the same speeds), but don't take that as a given.
Click to expand...

Huh. I was pretty sure you could crossfire cards from the same series.

I imagine the experience is no smoother with identical cards though due to how crossfire works. I have seen a system with a 5770 and a 5750 crossfire'd and there is literally no performance difference between that and mine, both in terms of smoothness and general performance.

I've never tried to overclock crossfire'd cards though. Don't know how that affects it.
 
Adster3000 said:
Richytractor wasn't wrong.
Click to expand...

Yes he was ;)

He said the first 2 numbers of the model must match:

richytractor said:
When using Crossfire, the GPU family is the important bit, and these must match (eg 69XX OR 68XX) so you can crossfire any 6970 with any 6970 or 6950, or 6870 with any 6870 or 6850, and brand does not matter.
Click to expand...

They don't in all cases.

You can CrossFire the 6850/70 with the 6790.

You can Crossfire the 6750/70 with the 5750/70.

You can CrossFire the 6670 with the 6570.

You can Crossfire the 5970 with the 58xx cards.

You can CrossFire the 5670 with the 5570.

You can Crossfire the 5550 with the 5450.
 
Bum. I was looking for that chart, but seeing as the OP had several threads going with various random questions which could've been in one or two posts was trying to keep it simple for them. Apologies for probably sounding like a bell (It was 3:30!).
 
In my defence, it was 03:06. =d.

I was trying to look for that chart after richytractor posted as well. I swore I saw something like that some time ago.

That Fuzion motherboard does look interesting. Crossfire and 5870 + gtx285 is amusing.

Doesn't seem to work very well though.
 
Adster3000 said:
Fair enough.

What about the "Fuzion" motherboard?
Click to expand...

Was that the Lucid chip? shame about that seemed a really good idea. I don't think it is totally gone as of yet. HIS put one on a 6970 card and there is a 6870x2 that uses it as a bridging chip in place of AMDs standard solution.

If it could only work on the hardware level and cut out the driver crap, but it seems not.
 
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