Yep, since this bench gives you points for CPU power, the quads definitely come ahead.
I got about 1000 points more in the tests just beacuse of the CPU score.
So far, I got 18,257
with the CPU at 3.6 GHz and the cards at 650/990.
As for HD gaming modes, the system definitely scales well. These are default clock runs.
1920x1200 with CPU at 3.2
And, just to show the power these cards really can deliver, here is 2560x1600
with CPU at 2.9.