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GeForce GTX 580 vs Radeon HD 6770 1GB

Intro

The GeForce GTX 580 uses a 40 nm design. nVidia has clocked the core speed at 772 MHz. The GDDR5 RAM is set to run at a frequency of 1002 MHz on this model. It features 512 SPUs along with 64 TAUs and 48 ROPs.

Compare those specifications to the Radeon HD 6770 1GB, which makes use of a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 RAM works at a speed of 1050 MHz on this specific model. It features 800 SPUs along with 40 Texture Address Units and 16 ROPs.

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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, because of 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 a lot (about 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

If using a high resolution is important to you, then the GeForce GTX 580 is superior to the Radeon HD 6770 1GB, by a large margin. (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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units of the card by the core clock 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 a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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