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Old February 18, 2011, 09:57 PM
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Default How do dual chip cards perform?

Do dual chip GPUs perform the exact same as having 2 single cards in SLI/CF with the exact same specs?

Or do dual chip cards see any improvement compared to SLI/CF... my best understanding is that dual chip cards are just 2 cards with an internal SLI/CF bridge and have the exact same properties (performance wise) as running two single cards.
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Old February 18, 2011, 10:23 PM
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They'll generally perform exactly the same as two separate cards. But not always. For the longest time the HD5970 performed quite a bit slower than two HD5870s. It look like 6 months before drivers were mature for it. If you have the room I would personally go w/ two separate cards.
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Old February 19, 2011, 12:17 PM
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Quote:
Originally Posted by lowfat View Post
They'll generally perform exactly the same as two separate cards. But not always. For the longest time the HD5970 performed quite a bit slower than two HD5870s. It look like 6 months before drivers were mature for it. If you have the room I would personally go w/ two separate cards.
But in that case it's because the 5970 was two *modified* 5870s with lower speeds to keep the TDP under 300w.

I'm asking out of curiosity, not upgrade reasons.
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Old February 19, 2011, 12:43 PM
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But even if you ramped the clocks up to HD5870 speeds (which it easily did) it was still slower than HD5870 crossfire in most cases. It wasn't until August/September 2010 that mature drivers started to show up for the card.
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Old February 20, 2011, 09:23 AM
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On the other side, my friend's GTX295 was like 15% faster after his sli'd GTX260 216sp's...
I know it has got 480 CUDA cores vs the 432 combined of the 260's, but the clocks are still lower on the 295.
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Old February 22, 2011, 06:32 AM
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Dual GPU cards from both Camps have been known to have more problems (usually driver related) than to single GPU cards scaled.

I never encountered the error myself , but there were complaints of stuttering, higher than average failure rate among other things.

Its usually (then again things change) a better bet to go with dual single GPU cards vs a Single Dual-GPU card.

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Old February 22, 2011, 01:29 PM
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Quote:
Originally Posted by GT7R View Post
On the other side, my friend's GTX295 was like 15% faster after his sli'd GTX260 216sp's...
I know it has got 480 CUDA cores vs the 432 combined of the 260's, but the clocks are still lower on the 295.
Hm, I thought the 295 was 2x 275.
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Old February 22, 2011, 02:27 PM
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packing dual gpus on a pcb is stressing it IMHO, theres only so much one pcb can handle before things go a bit wonky, mind you its developing well, and will be interesting to see what the two camps bring out in full force this time around..
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Old February 22, 2011, 03:32 PM
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Quote:
Originally Posted by maverick_brent View Post
packing dual gpus on a pcb is stressing it IMHO, theres only so much one pcb can handle before things go a bit wonky, mind you its developing well, and will be interesting to see what the two camps bring out in full force this time around..

Well yeah I do believe one PCB might be too much. Which is why I loved the GX2 which used twin PCB's still wedged into one card. That still had issues though but was far more stable then the GTX295 co-op.

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Old February 22, 2011, 04:15 PM
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Quote:
Originally Posted by krajee View Post
Hm, I thought the 295 was 2x 275.
it is


dual card are not worth it IMO, i've get the fastest single gpu card over those dualgpu card anyday.
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