GeForce 810M vs Radeon HD 7990

Intro

Compare all that to the Radeon HD 7990, which has GPU core speed of 950 MHz, and 3072 MB of GDDR5 memory set to run at 1500 MHz through a 384-bit bus. It also features 2048 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 810M		15 Watts
Radeon HD 7990		375 Watts
	Difference: 360 Watts (2400%)

Memory Bandwidth

The Radeon HD 7990, in theory, should perform quite a bit faster than the GeForce 810M overall. (explain)

Radeon HD 7990		576000 MB/sec
GeForce 810M		14400 MB/sec
	Difference: 561600 (3900%)

Texel Rate

The Radeon HD 7990 is much (more or less 4019%) more effective at AF than the GeForce 810M. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce 810M		5904 Mtexels/sec
	Difference: 237296 (4019%)

Pixel Rate

The Radeon HD 7990 will be quite a bit (about 1960%) faster with regards to full screen anti-aliasing than the GeForce 810M, and should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce 810M		2952 Mpixels/sec
	Difference: 57848 (1960%)

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 (measured in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). 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 potential to get to the max fill rate.