GeForce GT 240 GDDR5 vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which features GPU clock speed of 950 MHz, and 3072 MB of GDDR5 RAM set to run at 1500 MHz through a 384-bit bus. It also is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
Radeon HD 7990		375 Watts
	Difference: 305 Watts (436%)

Memory Bandwidth

The Radeon HD 7990, in theory, should perform quite a bit faster than the GeForce GT 240 GDDR5 overall. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 521600 (959%)

Texel Rate

The Radeon HD 7990 should be much (more or less 1282%) faster with regards to texture filtering than the GeForce GT 240 GDDR5. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 225600 (1282%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7990 is the winner, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 56400 (1282%)

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 largest amount of information (measured in MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.