GeForce GT 240 GDDR5 vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which has core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
Radeon HD 6990		375 Watts
	Difference: 305 Watts (436%)

Memory Bandwidth

In theory, the Radeon HD 6990 should perform much faster than the GeForce GT 240 GDDR5 in general. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 265600 (488%)

Texel Rate

The Radeon HD 6990 should be much (approximately 805%) faster with regards to AF than the GeForce GT 240 GDDR5. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 141760 (805%)

Pixel Rate

The Radeon HD 6990 is quite a bit (approximately 1107%) better at FSAA than the GeForce GT 240 GDDR5, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 48720 (1107%)

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 maximum amount of data (counted in MB per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.