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The higher the resolution the wider the results become - the 2GB memory on the 4870x2 will come in handy for 24"+for the last time they are currently the ONLY 4870X2 scores that are out their I can directly compare against... I think pretty much everyone knows 06 isn't always representative of gaming performance :S
EDIT: http://anandtech.com/video/showdoc.aspx?i=3354&p=5 some with 8800GT SLI and 4870X2 - not a huge difference in it - until your memory capacity/bandwidth limited.
At 3.2ghz the 3dmark06 test is clearly very cpu limited. I'm sure with some insanely clocked quad, 20000 can be broken easily even with the x2 at stock.