GeForce GT 340 1GB vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which features a core clock speed of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It is made up of 1536 SPUs, 96 Texture Address Units, 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

Theoretically speaking, the Radeon HD 6990 should be 488% quicker than the GeForce GT 340 1GB overall, because of its higher data rate. (explain)

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

Texel Rate

The Radeon HD 6990 is much (more or less 805%) better at texture filtering 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

If using high levels of AA is important to you, then the Radeon HD 6990 is superior to the GeForce GT 340 1GB, by far. (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: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units 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 rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.