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GeForce GTX 660 Ti vs Radeon HD 5850

Intro

The GeForce GTX 660 Ti uses a 28 nm design. nVidia has set the core speed at 915 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this particular model. It features 1344 SPUs along with 112 TAUs and 24 ROPs.

Compare those specifications to the Radeon HD 5850, which features a clock frequency of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1440(288x5) SPUs, 72 Texture Address Units, and 32 ROPs.

Display Graphs

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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 is 13% quicker than the Radeon HD 5850 overall, due to its higher bandwidth. (explain)

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

Texel Rate

The GeForce GTX 660 Ti is much (approximately 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

If running with a high resolution is important to you, then the Radeon HD 5850 is a better choice, not by a very large margin though. (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

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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

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Model GeForce GTX 660 Ti Radeon HD 5850
Manufacturer nVidia AMD
Year August 2012 September 30, 2009
Code Name GK104 Cypress PRO
Memory 2048 MB 1024 MB
Core Speed 915 MHz 725 MHz
Memory Speed 6000 MHz 4000 MHz
Power (Max TDP) 150 watts 151 watts
Bandwidth 144000 MB/sec 128000 MB/sec
Texel Rate 102480 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 23200 Mpixels/sec
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
Fab Process 28 nm 40 nm
Transistors 3540 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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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