GeForce GTX 850M vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which has GPU core speed of 830 MHz, and 2048 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also features 1536 Stream Processors, 96 TAUs, and 32 Raster Operation Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6990		5820 points
GeForce GTX 850M		3340 points
	Difference: 2480 (74%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Radeon HD 6990		375 Watts
	Difference: 335 Watts (838%)

Memory Bandwidth

In theory, the Radeon HD 6990 should be 900% faster than the GeForce GTX 850M in general, due to its higher bandwidth. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 288000 (900%)

Texel Rate

The Radeon HD 6990 is a lot (approximately 355%) more effective at texture filtering than the GeForce GTX 850M. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 124320 (355%)

Pixel Rate

The Radeon HD 6990 is much (approximately 279%) faster with regards to FSAA than the GeForce GTX 850M, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 39104 (279%)

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 information (counted in megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per 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 - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.