Hardware used for testing the motherboards:

• Intel Core 2 E8500 processor (Socket LGA775, 3.16GHz, two cores)
• XFX GeForce 7800 GT video card
• Noctua NH-U 12 heatsink with two 12cm fans
• Seagate Barracuda 7200.9 SATA2 drive
• Corsair HX620W Modular power supply
• Gigabyte X48-DQ6 motherboard (this one)
• Asus P5E-VM HDMI motherbioard
• Asus P5E3 Premium WiFi motherboard
• Asus P5Q Deluxe motherboard
• MSI P45 Platinum motherboard
• 2 * 1024 MB Corsair PC2-8888 memory @ 4-4-4-10/2T (for DDR2 motherboards)

For now, here is a listing of the tests performed:

• PC Magazine Business Winstone 2004
• PC Magazine Multimedia Content Creation 2004
• RightMark Memory Analyzer
• SiSoft Sandra 2007 CPU, MMX, Memory Benchmarks
• HDTach
• WinRAR 
• TMPGEnc MPEG2 Encoding
• LAME MP3 Encoding
• Call of Duty
• Doom 3
• Quake 4
• Comanche 4
• Halo
• Jedi Knight: Jedi Academy
• Unreal Tournament 2004

Video drivers used were the NVIDIA ForceWare version 169.12