AMD Radeon HD 4870 X2 Review

The R700 board is literally made up of two RV770s with a PCI Express switch connecting the two. The clock speeds are identical to the Radeon HD 4870, and memory size per GPU has been doubled to 1GB, which could help in hi res cases with AA enabled. In other words, R700 should perform very much like a pair of 4870s in CrossFire. Or should it?
Building a Better CrossFire

ATI Catalyst™ 8.7 Display Driver

Performance Improvements

The following performance gains are noticed with this release of Catalyst™.
3DMark Vantage: Performance increases of up to 20% is noticed in the Performance Preset on single card configured systems when using ATI Radeon™ HD 36xx or ATI Radeon™ HD 34xx products
Company of Heroes DX10: Performance increases of 3% to 12% is noticed in specific maps on single card configured systems when using either an ATI Radeon™ HD 48xx, ATI Radeon ™ HD 38xx, or an ATI Radeon™ HD 36xx product
Lost Planet DX10: Performance increases of 4% to 15% is noticed in specific maps on single card configured systems when using either an ATI Radeon™ HD 48xx, ATI Radeon™ HD 38xx, or an ATI Radeon™ HD 36xx product
Call Of Duty 4 DX9: Performance increases of up to 4% in specific maps is noticed on single card configured systems when using an ATI Radeon™ HD 48xx product
Lost Planet DX9: CrossFire™ scaling improves up to 1.7x and performance increases up to 80% across all Radeon™ products when AA and AF is enabled