Can These Cards Hold Their Rated Clock Rates?
All of these boards employ the same Curaçao GPU manufactured at 28 nm, which is basically the Pitcairn processor, re-branded. It comes equipped with 1280 shaders and exposes an aggregate 256-bit memory interface. Only the core and memory clock rates differ (even compared to the older Pitcairn-based Radeon HD 7870).
|Model||GPU Boost Clock (MHz)||Memory Clock (MHz)||Memory Bandwidth (GB/s)||Fillrate (GPixel/s)||Fillrate (GTexel/s)|
|Asus DirectCU II R9270X-DC2T-4GD5 R9 270X 4 GB||1120||1400||179.2||35.8||89.6|
|Club 3D royalQueen CGAX-R927X6 R9 270X 2 GB||1080||1400||179.2||34.6||86.4|
|Gigabyte GV-R927XOC-4GD R9 270X 4 GB||1100||1400||179.2||35.2||88.0|
|HIS IceQ X² Turbo Boost Clock H270XQMT2G2 R9 270X 2 GB||1140||1400||179.2||36.5||91.2|
|HIS iPower IceQ X² Turbo H270QMT2G2M R9 270 2 GB||975||100||179.2||31.2||78.0|
|MSI Radeon R9 270X Gaming 4 GB||1120||1400||179.2||35.8||89.6|
|PowerColor PCS+ AXR9 270X 2GBD5-PPDHE R9 270X 2 GB||1100||1425||182.4||35.2||88.0|
|Sapphire Dual-X 100365L R9 270 2 GB||945||1400||179.2||30.2||75.6|
|Sapphire Toxic Radeon R9 270X 2 GB||1150||1500||192.0||36.8||92.0|
|Sapphire Vapor-X 100364VXL Radeon R9 270X 2 GB||1100||1450||185.6||35.2||88.0|
To boost, or not to boost, that is the question. Does a high specified clock rate mean anything if a card can't maintain it under load, and is forced to throttle back? We took all ten cards, warmed them up through a real-world graphics load, and then started recording their clock rates during an exhaustive gaming loop.