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One product named Radeon HD 4870 X2, featuring 2×1GB GDDR5 memory, was released on August 12, 2008, while another dual-GPU product, the Radeon HD 4850 X2, with GDDR3 memory and lower clock speeds, is also available. A minor update was introduced on April 2, 2009 with the launch of Radeon HD 4890 graphics cards based on the RV790 GPU.
Radeon HD 4870 June 25, 2008 RV770 XT 956 256 750 900 800:40:16 12.0 30.0 512 1024 2048 115.2 1200 240.0 150 $299 Radeon HD 4890 April 2, 2009 RV790 XT 959 282 850 975 13.6 34.0 1024 2048 124.8 GDDR5 1360 272.0 190 $249 Radeon HD 4850 X2 November 7, 2008 R700 (2xRV770 PRO) 956×2: 256×2: 625 995 800:40:16×2: 10.0×2: 25.0×2: 512×2 1024×2: ...
A later development to the CrossFire infrastructure includes a dual GPUs with on-board PCI Express bridge that was released in early 2008, the Radeon HD 3870 X2 and later in Radeon HD 4870 X2 graphics cards, featuring only one CrossFire connector for dual card, four GPU scalability.
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TeraScale is the codename for a family of graphics processing unit microarchitectures developed by ATI Technologies/AMD and their second microarchitecture implementing the unified shader model following Xenos.
Radeon HD 4850/4870 Evergreen: TeraScale 2: 40 nm 4.5 ... or 6670 discrete graphics card. This is similar to the Hybrid CrossFireX technology available in the AMD 700 ...