GeForce GTX 465 vs Radeon HD 7970

Intro

Compare all that to the Radeon HD 7970, which comes with GPU clock speed of 925 MHz, and 3072 MB of GDDR5 RAM set to run at 1375 MHz through a 384-bit bus. It also is made up of 2048 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 465		200 Watts
Radeon HD 7970		250 Watts
	Difference: 50 Watts (25%)

Memory Bandwidth

Performance-wise, the Radeon HD 7970 should theoretically be quite a bit better than the GeForce GTX 465 overall. (explain)

Radeon HD 7970		264000 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 161408 (157%)

Texel Rate

The Radeon HD 7970 should be much (more or less 343%) more effective at texture filtering than the GeForce GTX 465. (explain)

Radeon HD 7970		118400 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 91692 (343%)

Pixel Rate

The Radeon HD 7970 will be quite a bit (more or less 52%) better at FSAA than the GeForce GTX 465, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7970		29600 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 10176 (52%)

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 (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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