GeForce GTX 295 vs Radeon HD 7790

Intro

Compare all that to the Radeon HD 7790, which features a clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
GeForce GTX 295		289 Watts
	Difference: 204 Watts (240%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 295 is 133% quicker than the Radeon HD 7790 overall, because of its higher data rate. (explain)

GeForce GTX 295		223776 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 127776 (133%)

Texel Rate

The GeForce GTX 295 should be much (more or less 65%) better at texture filtering than the Radeon HD 7790. (explain)

GeForce GTX 295		92160 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 36160 (65%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 295 is the winner, and very much so. (explain)

GeForce GTX 295		32256 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 16256 (102%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 processed in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics 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 Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.