So this is the best RX470 in the world. The only one with the 8GHz Samsung RAM and the 2GHz default memory frequency (overclock to 2.1GHz is possible). The others use 7 Gbps Hynix Ram and therefore shouldn't be overclocked from the 1750 MHz frequency.
The GPU is clocked at 1121 MHz base, 1260 MHz boost.
This compares to the stock RX470 which is specced at 926 base, 1206 boost, 6.6Gb RAM. And the RX480 which is 1120 base, 1266 boost, and has 7 Gbps RAM in the 4GB model, 8 Gbps in the 8GB
For comparison, the standard Sapphire RX480 8GB (£230) is clocked at 1120 MHz base, 1266 MHz boost.
RX470 8GB Nitro+: 2048:128:32 core config, 8 gbps RAM
RX480 : 2304:144:32 core config, 7Gbps RAM for the 4GB, 8 Gbps Ram for the 8GB. Clock speeds similar.
Here are some benchmarks from a German magazine @ 1080p:https://www.computerbase.de/2016-08/radeon-rx-470-test/3/#abschnitt_benchmarks_in_1920__1080https://www.computerbase.de/2016-09/geforce-gtx-1060-3gb-test/3/#toc
RX470 4GB (Strix) 47.8 fps
RX470 8GB Nitro+ (this card) 53.2 fps
GTX 1060 3GB (Asus OC) 54.8fps
RX480 8GB (stock) 55.1 fps
GTX 1060 6GB (stock) 58.1fps
RX480 8GB Nitro+ 58.9 fps
GTX 1060 6GB (MSI Gaming) 62.1fps
So 97% of the performance of a typical GTX 1060 3GB, but without the RAM shortage. 96.5% of the performance of a standard (£230) RX480 8GB and 90% of the performance of a good (£240) RX480 8GB.
The GTX 1060 6GB offers comparable price/performance, but obviously for more pounds, and there's some argument that it's less future-proof as AMD has relatively better DirectX 12 performance vs DirectX 11, and this has 8GB of RAM so it's not going to run out of texture room.
I think this is obviously a better buy than a typical RX480 4GB (should perform pretty much the same) or the GTX 1060 3GB (very slightly faster, but stupid low RAM).
You pays your money and you takes your choice but for me at the moment if I was buying I would be looking at 1050 TI (£130), this card (£190), or the GTX 1060 6GB (£220 or so).
Flubit will probably knock some more off.....
Edit: if you don't fancy Flubit, Ebuyer have reduced their price (from £240) to match this, and you'll get a free copy of Hitman if you buy there. (Amazon not participating) http://www.ebuyer.com/753949-sapphire-radeon-rx-470-nitro-8gb-gddr5-dvi-d-hdmi-displayport-pci-e-graphics-11256-02-20g