Here are the gpus with their proposed cpu, mobo etc.
MSI AMD Radeon R9 270X 2GB (twin frozr gaming)
FX-6300 3.5GHZ
KINGSTON KHX1600C9D3/x4G
ASROCK 960gc-gs
vs
MSI AMD R9 270X 2G OC BF4
FX-6300 3.5GHZ
KINGSTON KHX1600C9D3/x4G
ASROCK 960gc-gs
vs
ASUS R9 270X 2GB GDDR5 256BIT (R9270X-DC2T-2GD5)
FX-6300 3.5GHZ
KINGSTON KHX1600C9D3/x4G
ASROCK 960gc-gs
MSI AMD Radeon R9 270X 2GB (twin frozr gaming)
FX-6300 3.5GHZ
KINGSTON KHX1600C9D3/x4G
ASROCK 960gc-gs
vs
MSI AMD R9 270X 2G OC BF4
FX-6300 3.5GHZ
KINGSTON KHX1600C9D3/x4G
ASROCK 960gc-gs
vs
ASUS R9 270X 2GB GDDR5 256BIT (R9270X-DC2T-2GD5)
FX-6300 3.5GHZ
KINGSTON KHX1600C9D3/x4G
ASROCK 960gc-gs