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GeForce GTX 580 3GB vs Radeon HD 6770


Intro

The GeForce GTX 580 3GB comes with a clock speed of 772 MHz and a GDDR5 memory frequency of 1002 MHz. It also uses a 384-bit memory bus, and uses a 40 nm design. It features 512 SPUs, 64 TAUs, and 48 ROPs.

Compare those specifications to the Radeon HD 6770, which uses a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 memory works at a frequency of 1050 MHz on this particular card. It features 800 SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
GeForce GTX 580 3GB 244 Watts
Difference: 136 Watts (126%)

Memory Bandwidth

In theory, the GeForce GTX 580 3GB should be 186% faster than the Radeon HD 6770 overall, due to its higher data rate. (explain)

GeForce GTX 580 3GB 192384 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 125184 (186%)

Texel Rate

The GeForce GTX 580 3GB is much (more or less 37%) better at texture filtering than the Radeon HD 6770. (explain)

GeForce GTX 580 3GB 49408 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 13408 (37%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 580 3GB is the winner, by far. (explain)

GeForce GTX 580 3GB 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

GeForce GTX 580 3GB

Radeon HD 6770

Specifications

Display Specifications

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Model GeForce GTX 580 3GB Radeon HD 6770
Manufacturer nVidia AMD
Year November 2010 January 2011
Code Name GF110 Juniper XT
Memory 3072 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 maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 are applied per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

GeForce GTX 580 3GB

Radeon HD 6770

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