SAPPHIRE RADEON R9 285 Sapphire Radeon R9 285 is Tonga clocked at 918Mhz with 2GB GDDR5 clocked at 5500Mhz. Sapphire Radeon R9 285 has memory interface of 256Bits with 1792 shaders with directx 11.2. Sapphire Radeon R9 270x is Pitcairn clocked at 1120Mhz with 2GB GDDR5 clocked at 5600Mhz. Sapphire Radeon R9 270x has memory interface of 256Bits with 1280 shaders with support for directx 11.2. Benchmarks are Battlefield 4, Bioshock Infinite, Dirt 3, Crysis 3, Metro Last Light, Sleeping Dogs, Thief and Tomb Raider 3. AMD FX 8370E with Gigabyte GA78LMT S2P using Windows 7."