GeForce GTX 260 vs Radeon HD 7770

Intro

Compare all of that to the Radeon HD 7770, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory works at a speed of 1125 MHz on this specific model. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce GTX 260		182 Watts
	Difference: 102 Watts (128%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 260 should in theory be a lot better than the Radeon HD 7770 overall. (explain)

GeForce GTX 260		111888 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 39888 (55%)

Texel Rate

The Radeon HD 7770 will be a small bit (approximately 9%) faster with regards to texture filtering than the GeForce GTX 260. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce GTX 260		36864 Mtexels/sec
	Difference: 3136 (9%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 260 is superior to the Radeon HD 7770, but not by far. (explain)

GeForce GTX 260		16128 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 128 (1%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR 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 worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.