1. Can You Put Ddr2 Ram In Ddr3 Slot

Due to the different pin design of DDR2 and DDR3, it will be physically impossible to put a DDR2 stick into a DDR3 slot. You will need to have DDR3 RAM. When you buy it, be sure that it runs at 1.65V or less; that's RAM designed for the X58 and P55 chipsets. The Dell specs say each slot can support maximum of 2GB per module so you can have 4 x 2GB = 8GB maximum of DDR2 RAM @800Mhz. But note that if you are running 32bit windows then you will only be able to use max of 3.5GB RAM, however much you physically install. No - DDR2 and DDR3 are not compatible nor interchangeable. Aside from electrical differences (voltage, signal timing etc) the SO-DIMM modules should be keyed differently, additionally I think DDR2 SO-DIMMs are 200 pin whereas DDR3 are 204 pin, they shouldn't fit in same slots. MacBook Pro 17' Models A1151 A1212 A1229 and A1261.

Can You Put Ddr2 Ram In Ddr3 Slot