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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 clocked the core speed at 980 MHz. The GDDR5 memory runs at a speed of 1502 MHz on this particular card. 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 core speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 memory. 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

Theoretically speaking, the GeForce GTX 660 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 should be much (approximately 131%) better 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 will be quite a bit (about 73%) more effective at full screen anti-aliasing than the Radeon HD 5770, and should be able to handle higher screen 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

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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 maximum amount of information (measured in MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core 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 output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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