AMD Radeon R9 280X and 270X final clock speeds revealed
It is now officially confirmed that R9 270X will use CURACAO XT processor which will be clocked at 1000 MHz. In boost state GPU will run at 1050 MHz, making it slightly faster than HD 7870 GE. In addition to faster GPU clocks also the memory is running at higher frequency — 1400 MHz (5.6 GHz effective).
The card is equipped with 2GB GDDR5 memory across 256-bit bus (although this is not confirmed). Furthermore we also don’t know the exactly GPU configuration. For now we just know it’s CURACAO, which is a Pitcairn derivative. It could either have 1280 cores or 1536.
The R9 280X will be equipped with TAHITI XTL,which is a TAHITI XT rebrand. The reference clock is 850/1000 MHz. The memory will run at 1500 MHz, making it almost a pure HD 7970 GE refresh (depending if 850 MHz is just a clock on this engineering sample).
Radeon R9 280X will have 3GB GDDR5 memory with 384-bit interface. Tahiti GPU features 2048 Stream Processors, 128 texturing units and 32 rastering units.