Shadyzm :
I have a CX500M. However I've been getting BSOD sometimes with the 0xa00001 error. So I'm thinking of returning the R7 260X and getting a new card. Would the MSI GTX 750 Ti 2GB GDDR5 be any better? Is it worth the extra £25?
If you think your PSU is failing, it's better to replace the PSU than the video card. The CX500 should run the R7 260X fine, so if it's not then some part is defective.
The GTX 750 Ti averages roughly 5 fps faster than the R7 260X, more in PhysX titles.