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GeForce GTX 660 Ti vs Radeon HD 5850

Intro

The GeForce GTX 660 Ti features clock speeds of 915 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1344 SPUs along with 112 TAUs and 24 ROPs.

Compare those specs to the Radeon HD 5850, which has a GPU core clock speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also is made up of 1440(288x5) Stream Processors, 72 TAUs, and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti 150 Watts
Radeon HD 5850 151 Watts
Difference: 1 Watts (1%)

Memory Bandwidth

In theory, the GeForce GTX 660 Ti should perform a bit faster than the Radeon HD 5850 overall. (explain)

GeForce GTX 660 Ti 144000 MB/sec
Radeon HD 5850 128000 MB/sec
Difference: 16000 (13%)

Texel Rate

The GeForce GTX 660 Ti will be a lot (more or less 96%) faster with regards to AF than the Radeon HD 5850. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 5850 52200 Mtexels/sec
Difference: 50280 (96%)

Pixel Rate

The Radeon HD 5850 should be a bit (about 6%) faster with regards to anti-aliasing than the GeForce GTX 660 Ti, and should be able to handle higher screen resolutions better. (explain)

Radeon HD 5850 23200 Mpixels/sec
GeForce GTX 660 Ti 21960 Mpixels/sec
Difference: 1240 (6%)

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

GeForce GTX 660 Ti

Amazon.com

Radeon HD 5850

Amazon.com

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

Model GeForce GTX 660 Ti Radeon HD 5850
Manufacturer nVidia AMD
Year August 2012 September 30, 2009
Code Name GK104 Cypress PRO
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe 2.1 x16
Memory 2048 MB 1024 MB
Core Speed 915 MHz 725 MHz
Shader Speed 915 MHz (N/A) MHz
Memory Speed 1500 MHz (6000 MHz effective) 1000 MHz (4000 MHz effective)
Unified Shaders 1344 1440(288x5)
Texture Mapping Units 112 72
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 3.2
Power (Max TDP) 150 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 144000 MB/sec 128000 MB/sec
Texel Rate 102480 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 23200 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

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