ĪMD stated the possibility of supporting 4 Radeon HD 3870 X2 cards, allowing 8 GPUs to be used on several motherboards, including the MSI K9A2 Platinum and Intel D5400XS, because these motherboards have sufficient spaces between PCI-E slots for dual-slot cooler video cards, presumably as a combination of two separate hardware CrossFire setups with a software CrossFire setup bridging the two, but currently with no driver support. Starting with the Catalyst 8.3 drivers, Amd/Ati officially supports CrossFireX technology for the 3800 series, which means that up to four GPUs can be used in a pair of Radeon HD 3870 X2. This has no negative effect on performance. They communicate via a bidirectional bus that has 16 lines for a bandwidth of 2 x 4 Gb/s. The card only integrates a PCI Express 1.1 bridge to connect the two GPUs. Technically, this Radeon HD 3870 X2 can really be understood as a CrossFire of two HD 3870 on a single PCB.

The processor achieved a peak single-precision floating point performance of 1.06 TFLOPS, being the world's first single-PCB graphics product breaking the 1 TFLOP mark. Radeon HD 3870 X2 (codenamed R680) was released on January 28, 2008, featuring 2 RV670 cores with a maximum of 1 GiB GDDR3 SDRAM, targeting the enthusiast market and replacing the Radeon HD 2900 XT.

The Radeon HD 3690 was released early February 2008 for the Chinese market only.

All other hardware specifications are retained.Ī further announcement was made that there would be a Radeon HD 3830 variant bearing the same features as Radeon HD 3690, but with a unique device ID that does not allow add-in card partners in China to re-enable the burnt-out portion of the GPU core for more memory bandwidth. The Radeon HD 3690, which was limited only to the Chinese market where it was named HD 3830, has the same core as the Radeon 3800 series but with only a 128-bit memory controller and 256 MiB of GDDR3 memory. The Radeon HD 38 became available mid-November 2007. The RV670 GPU is also the base of the FireStream 9170 stream processor, which uses the GPU to perform general purpose floating-point calculations which were done in the CPU previously. The Radeon HD 3800 series was based on the codenamed RV670 GPU, packed 666 million transistors on a 55 nm fabrication process and had a die size at 192 mm 2, with the same 64 shader clusters as the R600 core, but the memory bus width was reduced to 256 bits. Main article: Radeon R600 (HD 2xxx, HD 3xxx) Series Radeon HD 3800

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