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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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Much higher clock speed 1,100 MHz vs 720 MHz Around 55% higher clock speed
Much higher effective memory clock speed 6,000 MHz vs 1,800 MHz More than 3.2x higher effective memory clock speed
Significantly better 3DMark vantage graphics score 28,000 vs 9,030 More than 3x better 3DMark vantage graphics score
Better 3DMark06 score 23,610 vs 13,300 Around 80% better 3DMark06 score
Better 3DMark 11 graphics score 8,520 vs 2,310 Around 3.8x better 3DMark 11 graphics score
Significantly better floating-point performance 2,816 GFLOPS vs 414.7 GFLOPS More than 6.8x better floating-point performance
Significantly higher pixel rate 35.2 GPixel/s vs 4.32 GPixel/s Around 8.2x higher pixel rate
Higher texture rate 88 GTexel/s vs 17.3 GTexel/s More than 5x higher texture rate
More memory 2,048 MB vs 1,536 MB Around 35% more memory
More shading units 1,280 vs 144 1136 more shading units
Much higher memory clock speed 1,500 MHz vs 900 MHz More than 65% higher memory clock speed
More texture mapping units 80 vs 24 56 more texture mapping units
More render output processors 32 vs 24 8 more render output processors
Wider memory bus 256 bit vs 192 bit Around 35% wider memory bus
Front view of GeForce GT 640 Rebrand

Reasons to consider the
Nvidia GeForce GT 640 Rebrand

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Lower TDP 75W vs 180W 2.4x lower TDP

Benchmarks Real world tests of Radeon R9 270X vs GeForce GT 640 Rebrand

3DMark 11 Graphics Industry standard benchmark that tests DirectX 11 GPU performance

Radeon R9 270X GeForce GT 640 Rebrand @ community.futuremark.com

3DMark Vantage Graphics Industry standard benchmark that tests DirectX 10 GPU performance

Radeon R9 270X GeForce GT 640 Rebrand @ community.futuremark.com

3DMark06 Industry standard benchmark that tests DirectX 9 GPU performance

Radeon R9 270X GeForce GT 640 Rebrand @ community.futuremark.com

Reviews Word on the street

Radeon R9 270X  vs GeForce GT 640 Rebrand 

9.0
7.2
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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