GeForce GTX 870M vs Radeon HD 7950

Intro

Compare all of that to the Radeon HD 7950, which comes with core speeds of 800 MHz on the GPU, and 1250 MHz on the 1536 MB of GDDR5 RAM. It features 1792 SPUs along with 112 Texture Address Units and 32 ROPs.

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 7950		7731 points
GeForce GTX 870M		4770 points
	Difference: 2961 (62%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M		110 Watts
Radeon HD 7950		200 Watts
	Difference: 90 Watts (82%)

Memory Bandwidth

Performance-wise, the Radeon HD 7950 should in theory be quite a bit better than the GeForce GTX 870M in general. (explain)

Radeon HD 7950		240000 MB/sec
GeForce GTX 870M		96000 MB/sec
	Difference: 144000 (150%)

Texel Rate

The GeForce GTX 870M is a little bit (approximately 18%) better at AF than the Radeon HD 7950. (explain)

GeForce GTX 870M		105392 Mtexels/sec
Radeon HD 7950		89600 Mtexels/sec
	Difference: 15792 (18%)

Pixel Rate

The Radeon HD 7950 is a little bit (approximately 13%) faster with regards to anti-aliasing than the GeForce GTX 870M, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7950		25600 Mpixels/sec
GeForce GTX 870M		22584 Mpixels/sec
	Difference: 3016 (13%)

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.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.