GPUBoss Review Our evaluation of 660 vs 840A among all GPUs

Gaming

Battlefield 3, Battlefield 4, Bioshock Infinite and 21 more

Graphics

T-Rex, Manhattan, Cloud Gate Factor, Sky Diver Factor and 1 more

Computing

Face Detection, Ocean Surface Simulation and 3 more

Performance per Watt

Battlefield 3, Battlefield 4, Bioshock Infinite and 32 more

Noise and Power

TDP, Idle Power Consumption, Load Power Consumption and 2 more

6.7

Overall Score

Winner
Nvidia GeForce GTX 660 

GPUBoss recommends the Nvidia GeForce GTX 660  based on its benchmarks.

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VS

Differences What are the advantages of each

Front view of GeForce GTX 660

Reasons to consider the
Nvidia GeForce GTX 660

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Better PassMark score 4,121 vs 873 Around 4.8x better PassMark score
Significantly higher effective memory clock speed 5,600 MHz vs 2,002 MHz More than 2.8x higher effective memory clock speed
Significantly higher memory bandwidth 179.2 GB/s vs 16.02 GB/s Around 11.2x higher memory bandwidth
Higher texture rate 79 GTexel/s vs 16.46 GTexel/s More than 4.8x higher texture rate
Significantly more texture mapping units 96 vs 16 80 more texture mapping units
Better floating-point performance 1,896.2 GFLOPS vs 790.3 GFLOPS Around 2.5x better floating-point performance
More render output processors 32 vs 8 24 more render output processors
Slightly more memory 2,048 MB vs 1,024 MB 2x more memory
More shading units 1,152 vs 384 Three times as many shading units
Higher pixel rate 19.75 GPixel/s vs 8.23 GPixel/s Around 2.5x higher pixel rate
Higher memory clock speed 1,400 MHz vs 1,001 MHz Around 40% higher memory clock speed
Wider memory bus 256 bit vs 64 bit 4x wider memory bus
Front view of GeForce 840A

Reasons to consider the
Nvidia GeForce 840A

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Higher clock speed 1,029 MHz vs 823 MHz More than 25% higher clock speed
Higher turbo clock speed 1,124 MHz vs 888 MHz More than 25% higher turbo clock speed
Better manhattan score 3,613.42 vs 3,282.26 More than 10% better manhattan score
Significantly lower TDP 33W vs 130W 3.9x lower TDP

Benchmarks Real world tests of GeForce GTX 660 vs 840A

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce GTX 660
3,352.64
GeForce 840A
3,360.38

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce GTX 660
3,282.26
GeForce 840A
3,613.42

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