Ack, it can get really complicated with multi-GPU. Basically, the higher total GPU horsepower the more single-core performance starts to matter, along with PCI-E bandwidth. Luckily we're not talking about Crossfiring absolute top-end cards here.
Long story short, the lack of L3 cache on the A-10 hurts gaming performance. If you're going to combine an AMD with a discrete GPU, then don't get Trinity. A FX-4xxx or FX-6xxx will serve you better.
Considering that, I'd say that CPU should be a good mate for Crossfired 5770s.
* the actual difference lies in design. The lack of L3 cache is a notable design decision. What it comes down to is that Trinity was designed as a one-stop solution for the mainstream market. It is not intended to compete in the high-end market, and it doesn't.
(with gaming being as demanding as it is, I feel it is definitely high-end. I don't really believe in "affordable" gaming because you end up making too many concessions)
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Contritium praecedit superbia.
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