GeForce 830M vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which features core clock speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. 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 830M		25 Watts
Radeon HD 6990		375 Watts
	Difference: 350 Watts (1400%)

Memory Bandwidth

Performance-wise, the Radeon HD 6990 should in theory be a lot better than the GeForce 830M in general. (explain)

Radeon HD 6990		320000 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 305600 (2122%)

Texel Rate

The Radeon HD 6990 should be a lot (more or less 868%) faster with regards to AF than the GeForce 830M. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 142896 (868%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6990 is superior to the GeForce 830M, by far. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 44888 (545%)

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 maximum amount of information (measured in MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, 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 maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.