Different sites different results. I don't see anything surprising there.
-Specifically The [H] was on Vista x64. DH was on Vista, unspecified 32 or 64.
-As far as COD4, DH does not clarify, as the [H] does on which texture setting it used. The fully maxed out "extra" setting would obviously stress the 256-bit bus much more than the 384-bit bus.
You're getting hung up on the numbers and not really thinking about how these sites got their numbers. General trends should not be hard to see. Don't get hung up on 5 or 10 fps here or there. What ALL reviews say is that sometimes the x2 wins, sometimes the ultra/gtx wins. So, you can't lose either way. Pick your poison and move on.
Agreed.