GeForce 825M vs Radeon R9 M280X

Intro

Compare those specs to the Radeon R9 M280X, which has a clock speed of 900 MHz and a GDDR5 memory frequency of 1375 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
Radeon R9 M280X		75 Watts
	Difference: 42 Watts (127%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M280X should in theory be a lot better than the GeForce 825M overall. (explain)

Radeon R9 M280X		88000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 73600 (511%)

Texel Rate

The Radeon R9 M280X will be much (about 271%) better at anisotropic filtering than the GeForce 825M. (explain)

Radeon R9 M280X		50400 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 36800 (271%)

Pixel Rate

The Radeon R9 M280X will be much (approximately 112%) more effective at anti-aliasing than the GeForce 825M, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 M280X		14400 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 7600 (112%)

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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics 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 maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.