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GeForce GTX 660 vs Radeon HD 5850

Intro

The GeForce GTX 660 has core clock speeds of 980 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 960 SPUs as well as 80 Texture Address Units and 24 Rasterization Operator Units.

Compare all of that to the Radeon HD 5850, which has GPU core speed of 725 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also is comprised of 1440(288x5) SPUs, 72 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
Radeon HD 5850 151 Watts
Difference: 11 Watts (8%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 should in theory be just a bit superior to the Radeon HD 5850 overall. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 5850 128000 MB/sec
Difference: 16192 (13%)

Texel Rate

The GeForce GTX 660 will be quite a bit (about 50%) more effective at texture filtering than the Radeon HD 5850. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 5850 52200 Mtexels/sec
Difference: 26200 (50%)

Pixel Rate

The GeForce GTX 660 should be just a bit (approximately 1%) more effective at FSAA than the Radeon HD 5850, and should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 5850 23200 Mpixels/sec
Difference: 320 (1%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 5850

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GTX 660 Radeon HD 5850
Manufacturer nVidia AMD
Year September 2012 September 30, 2009
Code Name GK106 Cypress PRO
Memory 2048 MB 1024 MB
Core Speed 980 MHz 725 MHz
Memory Speed 6008 MHz 4000 MHz
Power (Max TDP) 140 watts 151 watts
Bandwidth 144192 MB/sec 128000 MB/sec
Texel Rate 78400 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 23200 Mpixels/sec
Unified Shaders 960 1440(288x5)
Texture Mapping Units 80 72
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 2540 million 2154 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTX 660

Amazon.com

Check prices at:

Radeon HD 5850

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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