GeForce 8800 GTS (G80) 640MB vs Radeon R9 M395X

Intro

Compare all of that to the Radeon R9 M395X, which has core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 18 Watts (14%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M395X should theoretically be a lot better than the GeForce 8800 GTS (G80) 640MB in general. (explain)

Radeon R9 M395X		160000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 96640 (153%)

Texel Rate

The Radeon R9 M395X should be much (approximately 276%) better at AF than the GeForce 8800 GTS (G80) 640MB. (explain)

Radeon R9 M395X		92544 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 67920 (276%)

Pixel Rate

The Radeon R9 M395X is a lot (about 125%) more effective at full screen anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and also will be able to handle higher resolutions more effectively. (explain)

Radeon R9 M395X		23136 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 12876 (125%)

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 information (in units of megabytes per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.