According to our associate , (R700) radeon HD 4870 X2, or more precisely its prototype, exceeds the GeForce GTX 280 in synthetic tests.
Video card on base of two RV770 GPU, which has 2x256- bit memory interface (can use both GDDR3 and GDDR5) was faster than the GeForce GTX 280 in the new 3DMark vantage test. The first video card collected X5500 and the second only X4800.
AMD will allow its partners to change the specifications of finished products (PCB design , frequency, memory type ), and this means, that diverse radeon HD 4870 X2 version will appear .......