ASUS RADEON R9 280X Asus Radeon R9 280x is Tahiti clocked at 1070Mhz with 3GB GDDR5 clocked at 6400Mhz. Asus Radeon R9 280x has memory interface of 384Bits with 2048 shaders with directx 11.2. Asus Radeon R9 270x is Pitcairn clocked at 1120Mhz with 2GB GDDR5 clocked at 5600Mhz. Asus Radeon R9 270x has memory interface of 256Bits with 1280 shaders with support for directx 11.2. Benchmarks are Battlefield 3, Bioshock Infinite, Dirt 3, Farcry 3, Hitman Absolution, Max Payne 3, Resident Evil 6 and Tomb Raider 3. AMD FX 8350 with Gigabyte GA78LMT S2P using Windows 8."