GeForce GT 340 1GB vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which comes with a clock speed of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is made up of 1536 SPUs, 96 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB		69 Watts
Radeon HD 6990		375 Watts
	Difference: 306 Watts (443%)

Memory Bandwidth

The Radeon HD 6990 should in theory perform much faster than the GeForce GT 340 1GB overall. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 265600 (488%)

Texel Rate

The Radeon HD 6990 will be much (about 805%) better at AF than the GeForce GT 340 1GB. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 141760 (805%)

Pixel Rate

The Radeon HD 6990 should be quite a bit (about 1107%) faster with regards to anti-aliasing than the GeForce GT 340 1GB, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GT 340 1GB		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 largest amount of data (in units of megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.