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GeForce GTX 660 vs Radeon HD 5770

Intro

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

Compare all of that to the Radeon HD 5770, which uses a 40 nm design. AMD has set the core frequency at 850 MHz. The GDDR5 RAM runs at a speed of 1200 MHz on this specific model. It features 800(160x5) 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 5770 108 Watts
GeForce GTX 660 140 Watts
Difference: 32 Watts (30%)

Memory Bandwidth

The GeForce GTX 660, in theory, should be much faster than the Radeon HD 5770 in general. (explain)

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

Texel Rate

The GeForce GTX 660 should be a lot (more or less 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 is much (approximately 73%) faster with regards to AA than the Radeon HD 5770, and also capable of handling higher screen resolutions without slowing down too much. (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

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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

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Model GeForce GTX 660 Radeon HD 5770
Manufacturer nVidia AMD
Year September 2012 October 13, 2009
Code Name GK106 Juniper XT
Memory 2048 MB 1024 MB
Core Speed 980 MHz 850 MHz
Memory Speed 6008 MHz 4800 MHz
Power (Max TDP) 140 watts 108 watts
Bandwidth 144192 MB/sec 76800 MB/sec
Texel Rate 78400 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 13600 Mpixels/sec
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
Fab Process 28 nm 40 nm
Transistors 2540 million 1040 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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

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