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GeForce GTX 660 vs Radeon HD 5770

Intro

The GeForce GTX 660 makes use of a 28 nm design. nVidia has set the core speed at 980 MHz. The GDDR5 memory runs at a speed of 1502 MHz on this model. It features 960 SPUs as well as 80 Texture Address Units and 24 Rasterization Operator Units.

Compare all of that to the Radeon HD 5770, which has GPU core speed of 850 MHz, and 1024 MB of GDDR5 memory running at 1200 MHz through a 128-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770 108 Watts
GeForce GTX 660 140 Watts
Difference: 32 Watts (30%)

Memory Bandwidth

The GeForce GTX 660, in theory, should perform a lot faster than the Radeon HD 5770 overall. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 5770 76800 MB/sec
Difference: 67392 (88%)

Texel Rate

The GeForce GTX 660 is a lot (approximately 131%) more effective at anisotropic filtering than the Radeon HD 5770. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 5770 34000 Mtexels/sec
Difference: 44400 (131%)

Pixel Rate

The GeForce GTX 660 should be quite a bit (about 73%) more effective at anti-aliasing than the Radeon HD 5770, and also able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 5770 13600 Mpixels/sec
Difference: 9920 (73%)

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

Amazon.com

Radeon HD 5770

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 Radeon HD 5770
Manufacturer nVidia AMD
Year September 2012 October 13, 2009
Code Name GK106 Juniper XT
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe 2.1 x16
Memory 2048 MB 1024 MB
Core Speed 980 MHz 850 MHz
Shader Speed 980 MHz (N/A) MHz
Memory Speed 1502 MHz (6008 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 960 800(160x5)
Texture Mapping Units 80 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 3.2
Power (Max TDP) 140 watts 108 watts
Shader Model 5.0 5.0
Bandwidth 144192 MB/sec 76800 MB/sec
Texel Rate 78400 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 13600 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the 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 can be applied per second. This 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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