We already talked about XFX Radeons last week, and we posted a few pictures yesterday, but now XFX has gone official and announced a couple of overclocked cards, too.

The HD4870 XXX is clocked at 775MHz, 25MHz over the reference clock, while its memory runs at 950MHz (3800MHz effective), 50 or 200MHz over reference depending on your state of mind. It will be available in 512MB and 1024MB flavors, sugar free.

The HD4650 will be available with 800MHz or 1000MHz memory, in 512MB and 1024MB versions, while the HD4850 sports a non-reference cooler, but sticks to reference clocks, at least for now.

Still no word on HD4870 X2 cards, though.

You can find the product page here.

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