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Why is their an SLI limitation w/different GPU's with Nvidia?

post #1 of 6
Thread Starter 
One thing I don't know is why dosen't or can't Nvidia allow the coupling of two different GPU's in one system to work together in SLI like AMD can between 6990/6970 for example?

You'd think a driver BIOS redeisgn could make this possible. You can run the two differnt CPU clocks and OC from MSI Afterburner or EVGA Precision easily.

I'd so love a GTX 580/560 combo in my rig in SLI.
     
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post #2 of 6
HD6990 has far more in common with a HD6970 than a GTX580 with a GTX560.

So, the reason that GTX580 cannot SLI with a GTX560 is similar to why a HD6970 cannot CF with a HD6870. My very crude analogy.
post #3 of 6
Thread Starter 
Quote:
Originally Posted by windfire View Post
HD6990 has far more in common with a HD6970 than a GTX580 with a GTX560.

So, the reason that GTX580 cannot SLI with a GTX560 is similar to why a HD6970 cannot CF with a HD6870. My very crude analogy.
Ok then how about another GF110 PCB? In other words why aren't they trying to make this a possiblity? Imagine how cool that would be?
     
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post #4 of 6
Quote:
Originally Posted by Arizonian View Post
Ok then how about another GF110 PCB? In other words why aren't they trying to make this a possiblity? Imagine how cool that would be?
Marketing. Nvidia does not want you spending $600 on a 580 and a 560. They want you to buy 2 580's.

I do agree with windfire. Lower end cards are more different compared to the higher end. And, to "save" a couple bucks pairing a 570 with a 580... simply not worth IMHO.
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post #5 of 6
Nvidia was going in that general direction with their Hybrid SLI technology a few years ago. It allows you to pair up a discrete GPU with an onboard GPU (the 2 do not have to be the same) to cooperate.
But now it seems Nvidia is shrinking from rather than expanding this front.
post #6 of 6
Actaully I agree here. Nvidia is overly restrictive with their SLI limitations. Not just between different GPU's but the fact it's disabled on all their lowend cards. I'm fairly sure no SLI support is killing GTX460 2WIN. I always thought it would be interesting to see the scaling on stuff like 2xGT240 or 2xGT440.

Granted in many cases it's not really smart to Crossfire two lowend cards, but atleast AMD gives you the freedom to do so.
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