GeForce GT 240 GDDR5 1GB vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which comes with a core clock speed 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 features 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 1GB		70 Watts
Radeon HD 7990		375 Watts
	Difference: 305 Watts (436%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should theoretically be quite a bit superior to the GeForce GT 240 GDDR5 1GB in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 521600 (959%)

Texel Rate

The Radeon HD 7990 is quite a bit (approximately 1282%) more effective at texture filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 225600 (1282%)

Pixel Rate

The Radeon HD 7990 is much (more or less 1282%) better at FSAA than the GeForce GT 240 GDDR5 1GB, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GT 240 GDDR5 1GB		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: Bandwidth is the max amount of data (in units of MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 are processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the 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 that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. 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 fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.