Nope, they max out at 512 stream processors with a 720Mhz clock. They also have a very limited memory bandwidth thanks to them being used with DDR3 rather than GDDR5.
Tbh I never understood, why they released the new R7-240/250 anyways, as the HD7750/7700 are way better.
Seems rather pointless when there was already the R7 260x in basically the same price bracket which does feature trueaudio as some minor incentive to pick that as a multi media card over the older 77*0.