its a 6870 1 gig going by the sticker on it.
but the lf r97fm says it could be a 6790. the only way to be sure is to stick it in and run dxdiag after you have installed the latest ati driver.
it looks like its had a vapor cooler put on it so maybe its a refurb or maybe its a ne line.
but going by its general appearance you may have gotten a bargain.http://www.diamondmm.com/6850PE51G.php
i had a look here and it is listed as a 6850 with that cooler