The detailed features of the 4870 X2 are remnant to the 4870’s. Everything is the same, but we’ll reference here again. UVD 2, TS Engine, etc. etc.
Now for the good part.
Compute power is a whopping 2.4 TFLOPS, with a memory bandwidth of 250 GB/sec. Currently, this makes the 4870 X2 series the fastest graphics card in the world, even if memory bandwidth doesn’t exactly meet our futuristic standards of memory to core latency. Given a power draw of 286W, we can see that the power efficiency or the amount of gigs per watt is a high ratio of 8.39, a remarkable number compared to the equivalent testing values of a GTX 280. Just for mention, the regular HD 4870 512 MB also outperform the GTX 280 efficiency standards, delivering a swift kick to any other competitors.