Does ati 5770 ddr5 1gb works on my ddr2 ram supported motherboard?

This is why people need to research before they buy components, the i3, i5 and i7 line of processors have DDR3 RAM controllers, they will not work with DDR2 RAM, hence why no motherboard exists. If you wanted to use DDR2 RAM, you should have purchased an older Intel Core 2 Duo or Core 2 Quad processor. Best thing you can do is see if you can return the RAM, then find the motherboard (that supports the i5 and CrossFire) you want and buy RAM that is actually compatible with that motherboard.

Muncher, did you miss the part where he said he had DDR2 RAM, the motherboard you listed takes DDR3, again there is no compatible motherboard. You need to buy DDR3 RAM if you want to be able to get a motherboard for your i5.

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