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GeForce GTX 580 vs Radeon HD 6770

Intro

The GeForce GTX 580 comes with a clock frequency of 772 MHz and a GDDR5 memory frequency of 1002 MHz. It also features a 384-bit bus, and uses a 40 nm design. It is made up of 512 SPUs, 64 Texture Address Units, and 48 Raster Operation Units.

Compare that to the Radeon HD 6770, which comes with a GPU core clock speed of 900 MHz, and 512 MB of GDDR5 RAM set to run at 1050 MHz through a 128-bit bus. It also is comprised of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
GeForce GTX 580 244 Watts
Difference: 136 Watts (126%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 580 will be 186% quicker than the Radeon HD 6770 in general, because of its greater bandwidth. (explain)

GeForce GTX 580 192384 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 125184 (186%)

Texel Rate

The GeForce GTX 580 will be much (more or less 37%) faster with regards to anisotropic filtering than the Radeon HD 6770. (explain)

GeForce GTX 580 49408 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 13408 (37%)

Pixel Rate

The GeForce GTX 580 should be quite a bit (approximately 157%) more effective at FSAA than the Radeon HD 6770, and will be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 580 37056 Mpixels/sec
Radeon HD 6770 14400 Mpixels/sec
Difference: 22656 (157%)

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 580

Amazon.com

Radeon HD 6770

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 580 Radeon HD 6770
Manufacturer nVidia AMD
Year November 2010 January 2011
Code Name GF110 Juniper XT
Memory 1536 MB 512 MB
Core Speed 772 MHz 900 MHz
Memory Speed 4008 MHz 4200 MHz
Power (Max TDP) 244 watts 108 watts
Bandwidth 192384 MB/sec 67200 MB/sec
Texel Rate 49408 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 37056 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 512 800
Texture Mapping Units 64 40
Render Output Units 48 16
Bus Type GDDR5 GDDR5
Bus Width 384-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 3000 million 1040 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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