No I don't have Malta 7990s, but clock for clock they are IDENTICAL to the current PC cards, of which I have 2. I can SEE ON MY SCREEN, 7950s v 7990 cores.
Its like me quoting a review taken out of context to try and convince you that you're not really 5'9", you're 5'6".
I'm not disputing what you're saying... I know they are identical clock for clock. If you look at the reviews, the Malta 7990 is performing closer to 2x7950 in gaming, when it should be just below 7970 CF. It makes no sense but that's what the data shows. If you read HardOCP's conclusion they couldn't make sense of it either. Bottom line, until this is sorted out I would not recommend buying one. Get the other 3-slot 7990 instead.
Some of the reviews were edited using a 'prototype' driver which showed crazy differences. I think its the equivalent of 13.5. Remember the current release drivers when the reviews were done 13.3 do NOT support the 7990, and shows as a hash of generic 79** cores. You lose some of the power control.
I agree performance looked unstable on 13.3, but wouldn't any dual GPU card on drivers they're not designed for
