Great Great, you will need to install retail OSX, here a guide for your mobo, good luck and report your progress back ;D

[GUIDE] Retail OS X Install (10.5.7) on Gigabyte GA-EX58-UD5 (Core i7) Mobo - InsanelyMac Forum

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HP Pavilion Elite m9250f
iAtkos v5i (10.5.8), Asus IPIBL-LB MOD BIOS, Intel Quad Core Q6600, 4GB RAM (800mhz), 2x500GB, nVidia 8600GT (Works), ALC888S (Works), Wireless RT73 (Works), LAN (Works) - How to Install - Blog - Hardware Combos - FAQ by TJ2K7
Macbook Pro 13"
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