GeForce GT 340 1GB vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which makes use of a 40 nm design. AMD has clocked the core speed at 830 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this model. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

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 will be 488% faster than the GeForce GT 340 1GB overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 6990 is a lot (approximately 805%) faster with regards to anisotropic 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

The Radeon HD 6990 should be much (approximately 1107%) faster with regards to full screen anti-aliasing than the GeForce GT 340 1GB, and also capable of handling higher resolutions more effectively. (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 max amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 processed per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.