Can you run an EVGA GTX 285 and an ASUS 9800GT in SLI?

Not anymore, they only have to be of the same chipset.

Since when? I know you can sli a 9800gtx and 9800gtx+... But other than that im pretty sure they need to be the same card...(other than memory size that is, you can sli a 1gb and 512mb card, or cards with different clockspeeds, but they have to be the same line, eg- not a GTX280 and a GTX260) (Not talking about different manufacturers though, an evga gtx275 can sli with an XFX gtx275, thats always been possible)
 
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Maybe this will help clear things up….From here

Can I mix and match graphics cards that have different GPUs?
No. For example, an XXXGT cannot be paired with a XXXGTX in an SLI configuration.

Can I mix and match graphics cards from different manufacturers?
Using 180 or later graphics drivers, NVIDIA graphics cards from different manufacturers can be used together in an SLI configuration. For example, a GeForce XXXGT from manufacturer ABC can be matched with a GeForce XXXGT from manufacturer XYZ.

Can I mix and match graphics cards is one of them is overclocked by the manufacturer?
Yes. A GeForce XXXX GTX that is overclocked can be mixed with a standard clocked GeForce XXXX GTX.

Can I mix and match graphics cards with different sizes of memory?
When purchasing a second graphics card, you should try to match the memory size so that you are ensured full value and performance from your purchase. However, while it is not recommended, NVIDIA does offer the flexibility to run graphics cards with different sized memory by using CoolBits. Using CoolBits (value set to 18), you can force both of the cards to use the lower of the two memory sizes and operate them together in SLI mode. When dissimilar memory sizes are enabled to work together using CoolBits, the effective memory size for each card becomes the smaller of
 
I forget the exact forceware. It was quite some time ago. They were first able to do with a 7900GT and a 7950GT, both were G71 gpu's. It's harder to get working correctly. ATi did it right with their Catalyst drivers, and you can easily run a 4870 and a 4850 in crossfire and see impressive improvement.

Can I mix and match graphics cards that have different GPUs?
No. For example, an XXXGT cannot be paired with a XXXGTX in an SLI configuration.

Yeah, you can't run a 9600GT and a 9800GTX+ together, but you can run a GTX 285 and GTX 275 together... I don't see the point, but it's possible.
 
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I forget the exact forceware. It was quite some time ago. They were first able to do with a 7900GT and a 7950GT, both were G71 gpu's. It's harder to get working correctly. ATi did it right with their Catalyst drivers, and you can easily run a 4870 and a 4850 in crossfire and see impressive improvement.



Yeah, you can't run a 9600GT and a 9800GTX+ together, but you can run a GTX 285 and GTX 275 together... I don't see the point, but it's possible.

Even if so... it would default to the speed of the lower card, just like the 4870/4850 pairing, the 4870 effectively becomes a 4850.
 
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