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GeForce GTX 580 vs Radeon HD 6770 1GB

Intro

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

Compare that to the Radeon HD 6770 1GB, which has a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
GeForce GTX 580		244 Watts
	Difference: 136 Watts (126%)

Memory Bandwidth

In theory, the GeForce GTX 580 is 186% faster than the Radeon HD 6770 1GB in general, due to its higher data rate. (explain)

GeForce GTX 580		192384 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 125184 (186%)

Texel Rate

The GeForce GTX 580 will be quite a bit (approximately 37%) faster with regards to anisotropic filtering than the Radeon HD 6770 1GB. (explain)

GeForce GTX 580		49408 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 13408 (37%)

Pixel Rate

The GeForce GTX 580 will be quite a bit (approximately 157%) more effective at anti-aliasing than the Radeon HD 6770 1GB, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 580		37056 Mpixels/sec
Radeon HD 6770 1GB		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

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Radeon HD 6770 1GB

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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 1GB
Manufacturer	nVidia	AMD
Year	November 2010	January 2011
Code Name	GF110	Juniper XT
Memory	1536 MB	1024 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 data (counted in megabytes per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, the result should 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 number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the card will be at 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 card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

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