Though we can't be sure about the validity of these benchmarks, OCUK decided to leak the results for the Radeon R9-290 (non x model). In a chart where they conveniently 'blur' the 290 name. This card will be the affordable product in the Hawaii product stack. Judging from the results the R9-290 beats NVIDIA's GeForce GTX 780 in synthetic benchmarks.
The R9-290 is based on 28 nm "Hawaii" just like the Radeon R9 290X, the R9 290 is a cheaper version featuring 2,560 Graphics Core Next stream processors, 160 TMUs, 64 ROPs, and a 512-bit wide GDDR5 memory interface, holding 4 GB of memory (if the leaks are right). The product seems to ship with a clock speeds of 947 MHz (core), and 5.00 GHz memory, GDDR5-effective). It should be available from the 31st of October, 2013.
Here are the benchmarks from Overclockers UK.
Radeon R9 290 Performance Figures Leaked by OCUK