What could be the issue if I used the GDDR5 graphics card on the DDR3 motherboard? - Quora
Jingsha X58 Motherboard Kit With Gddr5 Gpu Hd 6750 1gb And E5 X5650 Cpu 8gb Ddr3 Ram Placa Mae Lga1366 Pc Assembly Kit Plate - Motherboards - AliExpress
Find all the DDR5 RAM supported Motherboards with this Compatibility List - PC Guide