GeForce 810M vs Radeon HD 7990

Intro

Compare all that to the Radeon HD 7990, which comes with a clock speed of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 384-bit bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 is 3900% faster than the GeForce 810M overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7990 is a lot (about 4019%) more effective at anisotropic filtering than the GeForce 810M. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7990 is the winner, by far. (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: Bandwidth is the largest amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.