X38 motherboard doesn't support the memory type you've listed , you need to go a notch higher and get the X48 chipset to add Corsair 1600 MHz DDR3 memory and 2X PCIe2.0x16 slots ( SLI or CrossfireX , maybe
😉 )
Source :
http://en.wikipedia.org/wiki/Intel_chipsets#Core_2_chipsets
Do you plan to use your system for maybe , two more years ?? . If no , donot spend the money on a dead socket like the LGA 775 . You would be better of with a SandyBridge platform .
Please list your full specs so that guys can help you . GL