GeForce GTX 295 vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which comes with a clock frequency of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 384-bit bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 295		289 Watts
Radeon HD 7990		375 Watts
	Difference: 86 Watts (30%)

Memory Bandwidth

Theoretically, the Radeon HD 7990 should perform a lot faster than the GeForce GTX 295 in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 295		223776 MB/sec
	Difference: 352224 (157%)

Texel Rate

The Radeon HD 7990 should be a lot (approximately 164%) better at texture filtering than the GeForce GTX 295. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 295		92160 Mtexels/sec
	Difference: 151040 (164%)

Pixel Rate

The Radeon HD 7990 should be quite a bit (approximately 88%) more effective at FSAA than the GeForce GTX 295, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTX 295		32256 Mpixels/sec
	Difference: 28544 (88%)

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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 applied per second. This is calculated by multiplying the total texture units of the card 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.