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GeForce GTX 660 vs Radeon HD 5850

Intro

The GeForce GTX 660 features a GPU core speed of 980 MHz, and the 2048 MB of GDDR5 memory is set to run at 1502 MHz through a 192-bit bus. It also is comprised of 960 Stream Processors, 80 TAUs, and 24 ROPs.

Compare that to the Radeon HD 5850, which uses a 40 nm design. AMD has clocked the core frequency at 725 MHz. The GDDR5 RAM works at a speed of 1000 MHz on this specific model. It features 1440(288x5) SPUs along with 72 Texture Address Units and 32 Rasterization Operator Units.

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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 theoretically be just a bit superior to the Radeon HD 5850 in general. (explain)

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

Texel Rate

The GeForce GTX 660 is much (approximately 50%) faster with regards to 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

If running with a high resolution is important to you, then the GeForce GTX 660 is superior to the Radeon HD 5850, not by a very large margin though. (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 max amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the 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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