GeForce GTX 260 216SP 55 nm vs Radeon HD 7770

Intro

Compare all of that to the Radeon HD 7770, which features a core clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce GTX 260 216SP 55 nm		171 Watts
	Difference: 91 Watts (114%)

Memory Bandwidth

In theory, the GeForce GTX 260 216SP 55 nm is 55% faster than the Radeon HD 7770 in general, due to its greater data rate. (explain)

GeForce GTX 260 216SP 55 nm		111888 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 39888 (55%)

Texel Rate

The GeForce GTX 260 216SP 55 nm should be a bit (approximately 4%) more effective at texture filtering than the Radeon HD 7770. (explain)

GeForce GTX 260 216SP 55 nm		41472 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 1472 (4%)

Pixel Rate

The GeForce GTX 260 216SP 55 nm is a small bit (about 1%) more effective at AA than the Radeon HD 7770, and also will be capable of handling higher resolutions better. (explain)

GeForce GTX 260 216SP 55 nm		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: Bandwidth is the largest amount of information (measured in MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.