The 270x sounds like a slight improvement over the 7870 from this info, so it seems to be the better of the two.
The Radeon HD 7870 had a Pitcairn GPU with 1280 shaders, 80 texture units, and 32 ROPs on it. A 1000 MHz core and 1200 MHz memory clock were ample for a solid gaming experience at 1920x1080, and an aggregate 256-bit bus with 2 GB of GDDR5 memory helped facilitate high detail settings.
Likewise, R9 270X brings to bear 1280 shaders, 80 texture units, and 32 ROPs. Its Curacao GPU notches up 50 MHz to 1.05 GHz, and the 2 GB of GDDR5 on our press sample runs at 1400 MHz (or 5.6 GT/s). There will be 4 GB models, AMD says, but they’ll be a bit pricier than the 2 GB version’s $200. Whereas the 7870 bore a 175 W board power, R9 270X is rated for 180 W. Fortunately, the small bump is meager enough that you’ll still find yourself using two six-pin auxiliary connectors.
R9 270X is a slightly faster Radeon HD 7870 priced as much as $30 more than its predecessor. We know those 7870s won’t last much longer, but for the time being, who’s going to want the 270X at its introductory price? I’m sure Don will let everyone know in his monthly column when the good deals on prior-gen products run out. Until then, the R9 270X is a “meh”, even if it has no trouble blowing past Nvidia's GeForce GTX 660. I'll take a 7870, thank-you-very-much.
PS: I am seeing the 7950 @ $200 also, a better card than the 270x or 7870 I think.
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