VR Zone received some information from an anonymous source about the upcoming ATI Radeon HD 4870 X2 (R700), one of the interesting things is that unlike previous CrossFire or SLI setups this card won't be plagued by micro stuttering.
While Radeon 3870X2 relies on the PLX chip to communicate between the GPUs, 4870X2 GPUs will communicate with each other through the memory. Since the GDDR5 is clocked at 1800, the total bandwidth will be roughly 160 GB/s at 1 Gigabyte through the 256bit-bus, compared to the 8 GB/s of the PLX chip of the HD3870x2. Also 4870x2 WILL NOT have micro stuttering.
The Radeon HD 4870 X2 1GB GDDR5 will have 1050MHz shader clock, 1800MHz memory and 2x 256-bit memory bus. The core clock is defined by the add-in board partners and it's said that ASUS will have the fastest cards.