ATI HD38x0 Video Card Series Specifications Leaked

The HD3850 runs at 668MHz core, while the GDDR3 memory runs at 828MHz, and two versions were listed with 256 and 512MB of memory. The HD3870 runs at 775MHz, or 50MHz less than the rumored 825MHz, and its 512MB of GDDR4 memory is clocked at 1200MHz. Both the HD3850 and HD3870 support Quad Crossfire on 790FX based motherboards; the only trouble is that many 790FX motherboards manufacturers will have just two PCIe slots.