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GeForce GTX 660 Ti vs Radeon HD 5850

Intro

The GeForce GTX 660 Ti has a core clock speed of 915 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 192-bit memory bus, and uses a 28 nm design. It features 1344 SPUs, 112 TAUs, and 24 ROPs.

Compare all that to the Radeon HD 5850, which uses a 40 nm design. AMD has clocked the core frequency at 725 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this particular card. It features 1440(288x5) SPUs along with 72 TAUs 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

Theoretically, the GeForce GTX 660 Ti should be just a bit faster than the Radeon HD 5850 in general. (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 (more or less 96%) more effective at texture filtering 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 will be a bit (more or less 6%) more effective at AA than the GeForce GTX 660 Ti, and will be capable of handling higher resolutions without losing too much performance. (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

Radeon HD 5850

Specifications

Display 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 largest amount of data (in units of MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling 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 that the graphics card could possibly record to the 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 filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

GeForce GTX 660 Ti

Radeon HD 5850

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