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My PC's Asus Radeon HD 4670 has pretty much become a legacy product (AMD have provided a legacy driver for Windows 8, which I use) but really the 5000s are the lowest they're supporting now.

So I thought I'd change the 4670 for a 6670, which I thought should be better than the 4670 (maybe not by much) but at least is still getting driver updates. Certainly no worse than the 4670 anyway. But it seems it is worse.

Once I'd swapped it, and re-ran WEI (I know, I know it's utterly hopeless) the Desktop Graphics score went from 6.7 to 5.9, and the 3D Graphics from 6.7 to 6.6.

So I read up, and everyone says 'ignore WEI'. So I ran Novabench, just to see what came out, and it scored Graphics at 150, with 3DFPS at 460. So out of curiosity, I put the 4670 back in and re-ran WEI and Novabench. WEI went back up to 6.7 for both types of graphics, and Novabench gave graphics 176, with a 3DFPS of 519.

Putting the 6670 back in has dropped the scores back down again. I used the AMD legacy Windows 8 driver for the 4670 (12.6) and then tried the 6670 with that driver as well: same result. So it doesn't seem driver related. Same outcome with both 12.10 and 12.11 b4.

The 6670 is a VTX, with 2Gb DDR3 as compared to the Asus 4670's 512Mb.

The PC itself has an AMD Phenom II X4 810 2.6Ghz processor with 8Gb DDR3 RAM, an SSD for the OS to sit on with a mechanical drive for data. Power supply's 450W. It's all pure overkill for what little I use it for, but if I put in what I consider to be a better card I expect it to be not worse at least!

Any suggestions before I send the thing back? Is VTX just a useless brand?

Cheers, and apologies for the vital piece of info I've probably omitted...