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GeForce GTX 660 vs Radeon HD 7770

Intro

The GeForce GTX 660 features a core clock frequency of 980 MHz and a GDDR5 memory frequency of 1502 MHz. It also uses a 192-bit memory bus, and makes use of a 28 nm design. It features 960 SPUs, 80 Texture Address Units, and 24 Raster Operation Units.

Compare those specifications to the Radeon HD 7770, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM works at a frequency of 1125 MHz on this model. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
GeForce GTX 660 140 Watts
Difference: 60 Watts (75%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 should be quite a bit faster than the Radeon HD 7770 in general. (explain)

GeForce GTX 660 144192 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 72192 (100%)

Texel Rate

The GeForce GTX 660 is quite a bit (approximately 96%) more effective at texture filtering than the Radeon HD 7770. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 38400 (96%)

Pixel Rate

The GeForce GTX 660 will be much (about 47%) more effective at full screen anti-aliasing than the Radeon HD 7770, and should be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 7520 (47%)

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

Radeon HD 7770

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 Radeon HD 7770
Manufacturer nVidia AMD
Year September 2012 February 2012
Code Name GK106 Cape Verde XT
Memory 2048 MB 1024 MB
Core Speed 980 MHz 1000 MHz
Memory Speed 6008 MHz 4500 MHz
Power (Max TDP) 140 watts 80 watts
Bandwidth 144192 MB/sec 72000 MB/sec
Texel Rate 78400 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 960 640
Texture Mapping Units 80 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 2540 million 1500 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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