Sapphire Radeon R9 290x is Hawaii clocked at 1000Mhz with 4GB GDDR5 clocked at 5000mhz. Sapphire Radeon R9 290x has a memory interface of 512bits with 2816 shader processors with support for directx 11.2. Sapphire Radeon R9 280x is Tahiti clocked at 1070Mhz with 3GB GDDR5 clocked at 6200mhz. Sapphire Radeon R9 280x has a memory interface of 384bits with 1248 shader processors with support for directx 11.2. The benchmark software for testing the Sapphire Radeon R9 290x and Sapphire Radeon R9 280x is as follows:- Battlefield 3, Bioshock Infinite, Dirt 3, Farcry 3, Hitman Absolution, Max Payne 3, Resident Evil 6 and Tomb Raider 3. The CPU is the AMD FX 8350 Vishera with Gigabyte GA78LMT S2P using Windows 7 SP1.



Link: UltimateHardware