GeForce GT 240 GDDR5 vs Radeon HD 6990

Intro

Compare all of that to the Radeon HD 6990, which comes with a core clock speed of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit bus, and uses a 40 nm design. It is comprised of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation 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

Performance-wise, the Radeon HD 6990 should in theory be a lot superior to the GeForce GT 240 GDDR5 overall. (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 a lot (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

If using a high screen resolution is important to you, then the Radeon HD 6990 is superior to the GeForce GT 240 GDDR5, by a large margin. (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 (measured in MB per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.