now let me post my single and CF results..
Rig spec:

Q6600 @ 4.01Ghz
Gigabyte P35T DQ6
Kingston HyperX DDR3 1375mhz @ 1426mhz 7-7-7-24
Corsair HX620watt
Sapphire 3870 Single

3870 @ default:
[attachmentid=352590]

3870 OC @ 891/1314:
[attachmentid=352591]
Rig Spec:

Q6600 @ 4.01Ghz
Gigabyte P35T DQ6
Kingston HyperX DDR3 1375mhz @ 1339mhz 7-7-7-23
Corsair HX620watt
Sapphire 3870 Crossfire

3870 CF @ default:
[attachmentid=352592]

3870 CF @ 820/1250:
[attachmentid=352593]

referring to those results i think 3870 CF pawned single 8800 ultra.

Nice result to share.

i've just tried crysis and when i asked it to set the graphic to optimal setting, it just detect it as medium spec..
so to make it comparable with my previous 8800gt, where i used high settings, i manually adjust all the settings to high, 1920x1200 and no AA.

specs:

Q6600 @ 3.2ghz (400x8)
hyperX ddr3 @ 1333 cl7
p35t dq6
3870cf @ default
xp sp2

Q6600 @ 3.2ghz (400x8)
hyperX ddr3 @ 1333 cl7
p35t dq6
Single 8800gt OC @ 700/1750/1800
xp sp2

using fraps to monitor,

avg fps for 8800gt is 26 while 3870 CF is 41..
lowest fps, i notice 8800gt only drop to 23 while 3870 CF drops to 33 (almost 20% performance drop compare to 8800gt 12% ) ..
highest fps 8800gt 31 and 3870 CF is 46