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GeForce GTX 580 vs Radeon HD 6770

Intro

The GeForce GTX 580 makes use of a 40 nm design. nVidia has set the core speed at 772 MHz. The GDDR5 memory is set to run at a frequency of 1002 MHz on this model. It features 512 SPUs as well as 64 TAUs and 48 ROPs.

Compare those specs to the Radeon HD 6770, which features core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 RAM. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 580 4960 points
Radeon HD 6770 1520 points
Difference: 3440 (226%)

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

The GeForce GTX 580, in theory, should be a lot faster than the Radeon HD 6770 overall. (explain)

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

Texel Rate

The GeForce GTX 580 is a lot (approximately 37%) faster with regards to AF than the Radeon HD 6770. (explain)

GeForce GTX 580 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 is the winner, by a large margin. (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

GeForce GTX 580

Radeon HD 6770

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 max amount of information (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

GeForce GTX 580

Radeon HD 6770

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