if your into gaming that card wont do you much good.
you'll be better off getting a dx9 card to game with.
if you really want to play crysis and sup com on "good" settings, i would go over the 2600 and 8600 cards, and:
a) get a 8800 or 2900 card now and make them last a year or two
b) get a dx9 card like x1950pro/xt (cause they are cheap as hell now) and make them last a year till the whole fuss about which card will be good enough to ply crysis dies down (since we will know which card in november as thats when crysis comes out)
c) get an even cheaper card just to last you 6 months or so (since even that time will be enough to see how the current line up of high end cards stack up against the games yet to be released)
So i take it that as short term solution if i put the HD2600XT (ddr4) one in and then like someone said earlier put in the 2900XT thats the best way to go and in the short term use the system at 1280 x 1024 res
so your short term option is either get a Hd2600XT now (thought i dont know why you want it so bad..it really is crap, i would still go for a x1950pro) and then in 6 months time when the more demanding dx10 games are out, see which card does the best and go for that as a single card option.
So you either have to spend some $$ and get a 8800GTX 320, which will run DX10 games reasonably well, or get a powerful DX9 card such as the X1950XT or the X1950Pro (XT is significantly better by the way).
Toms is showing the speed of the memory at 1100mhz, scan is showing the DDR speed (double data rate) this is basically the normal memory speed x2,
sooo in this case 1100x2 = 2200. Either way, its the same thing.
an example would be my x1950 pro. when using monitoring tools it says memory is running at 702mhz, but if you look else where on sites it will say that has 1.4ghz DDR. That's just 702x2 (to get DDR), so in a nut shell, its the same thing.
Soooo the answer to your question is....no the one you are looking at is exactly the same on as on toms list.