http://wccftech.com/amd-possibly-launching-tahiti-le-based-radeon-hd-7800-series-gpu-november/
Standard 7870 has 1280, a 7950 has about 1750'ish
The Tahiti LE chip would hold 24 compute units with a total of 1536 stream processors, 32 ROPs and a memory of 2GB GDDR5 along a 256-bit interface. Looking at the clock speeds the HD 7800 series offer, the Tahiti LE can also possibly be a GHz edition card with clock set around 1000 MHz and memory at 1200 MHz.
Standard 7870 has 1280, a 7950 has about 1750'ish