GeForce GT 240 GDDR5 vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which comes with clock speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 96 TAUs 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 6990		375 Watts
	Difference: 305 Watts (436%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 will be 488% quicker than the GeForce GT 240 GDDR5 in general, because of its greater data rate. (explain)

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

Texel Rate

The Radeon HD 6990 will be quite a bit (more or less 805%) more effective at texture filtering 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 a lot (more or less 1107%) more effective at full screen anti-aliasing than the GeForce GT 240 GDDR5, and will be capable of handling higher screen resolutions better. (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: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video 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 amount of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of 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 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 max fill rate.