Since Yorkfield is a Socket 775 chip it can theoretically run on any Socket 775 board that has a BIOS supporting the CPU and a VRM that can handle the required voltages.  Intel recommends P35 or X38 chipsets, but there are reports that P965, P975X and NVIDIA 680i chipsets may also work, depending on the manufacturer of the actual board.  As always, check before you leap.  For our tests we ran the QX9650 on an X38 based Asus P5E3 Deluxe board, one of the best DDR3 overclocking Core 2 boards on the market.

Hardware used for testing the motherboards:

• Intel Xeon X3210 Quad Core processor
• Intel Penryn QX9650 Quad Core Extreme 1333FSB processor
• Intel Penryn QX9770 Quad Core Extreme 1600FSB processor
• 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 P35T-DQ6 motherboard (X3210 DDR2 tests)
• Asus P5E3 Deluxe WiFi motherboard (QX9650 & X3210 DDR3 tests)
• Asus P5DH Deluxe motherboard (QX6700 tests)
• 2 * 1024 MB Corsair PC2-8888 memory @ 4-4-4-10/2T (for DDR2 motherboards)
• 2 * 1024 MB OCZ PC3-14400 memory @ 1333/1600/1800 8-8-8-24/2T (for DDR3 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
• World In Conflict

Video drivers used were the NVIDIA ForceWare version 93.71 package.