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Differences What are the advantages of each

Front view of Radeon R9 270X

Reasons to consider the
Sapphire Radeon R9 270X

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Significantly higher clock speed 1,100 MHz vs 925 MHz Around 20% higher clock speed
Higher effective memory clock speed 6,000 MHz vs 5,500 MHz Around 10% higher effective memory clock speed
Higher memory clock speed 1,500 MHz vs 1,375 MHz Around 10% higher memory clock speed
Lower TDP 180W vs 250W Around 30% lower TDP
Front view of Radeon HD 7970

Reasons to consider the
AMD Radeon HD 7970

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More memory 3,072 MB vs 2,048 MB 50% more memory
Better floating-point performance 3,789 GFLOPS vs 2,816 GFLOPS Around 35% better floating-point performance
Higher texture rate 118.4 GTexel/s vs 88 GTexel/s Around 35% higher texture rate
More shading units 2,048 vs 1,280 768 more shading units
More texture mapping units 128 vs 80 48 more texture mapping units
More compute units 32 vs 20 12 more compute units
Wider memory bus 384 bit vs 256 bit 50% wider memory bus
Higher BioShock infinite framerate 70.4 fps vs 55.1 fps Around 30% higher BioShock infinite framerate
Higher battlefield 3 framerate 100.5 fps vs 84.3 fps Around 20% higher battlefield 3 framerate

Benchmarks Real world tests of Radeon R9 270X vs HD 7970

Battlefield 3 (2013) 1920x1080 - Ultra quality + FXAA-HIGH

Radeon R9 270X
84.3 fps
Radeon HD 7970
100.5 fps

BioShock Infinite 1920 x 1080 - Ultra preset + DX11 (DDOF)

Radeon R9 270X
55.1 fps
Radeon HD 7970
70.4 fps

Reviews Word on the street

Radeon R9 270X  vs HD 7970 

9.0
8.8
The 28 nm "Pitcairn" silicon, on which the Radeon R9 270X is based, features 1,280 stream processors based on the Graphics CoreNext micro-architecture, 80 texture memory units (TMUs), 32 raster operations units (ROPs), and a 256-bit wide GDDR5 memory interface, holding 2 GB of memory.
Radeon R9 270X

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