Here's the results from Pete's framebuffer test.
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Frontbuffer reading speed (back)
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Format: 01 - Speed: 36.9405 Mpix/s 110.821 MB/s
Format: 02 - Speed: 37.8527 Mpix/s 151.411 MB/s
Format: 03 - Speed: 37.3992 Mpix/s 112.198 MB/s
Format: 04 - Speed: 38.1856 Mpix/s 152.743 MB/s
Frontbuffer reading speed (front)
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Format: 01 - Speed: 37.6614 Mpix/s 112.984 MB/s
Format: 02 - Speed: 37.7269 Mpix/s 150.908 MB/s
Format: 03 - Speed: 37.9453 Mpix/s 113.836 MB/s
Format: 04 - Speed: 38.0983 Mpix/s 152.393 MB/s
I also ran AquaMark3 twice and for some reason the first run was way slower than the second (and I took them a week or two apart). On the first test, the massive overdraw explosion went at about 8 FPS but went much faster the second time. Maybe I had AA/AF forced to a high level without knowing it... I also ran 3DMark 2001 at 1600x1200 and my score was somewhere around 15,500.
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Main PC:
Asus P6T Deluxe, Intel Core i7 920 C0 @ 3.7 GHz (195x19, 1.3v core, 1.84v PLL, 1.3625v uncore) w/Thermalright Ultra 120 Extreme, 3x2 GB G Skill PC3-12800 @ 780 MHz, 7-7-7-21-1T, 1.66v; ATi Radeon HD 4870 1 GB @ 790/1000 w/Zalman VF-1000, 300 GB WD VelociRaptor, 4x500 GB WD RE2 (RAID 10), 3ware 9650SE-4LPML RAID controller, SB X-Fi Titanium, Seasonic M12D 750w, CM Stacker 810, Windows 7 Pro 64-bit, Dell 2007WFP
XBL/PSN/WoW: Thordrune