GeForce 825M vs Radeon R9 M265X

Intro

Compare those specifications to the Radeon R9 M265X, which makes use of a 28 nm design. AMD has clocked the core speed at 575 MHz. The GDDR5 RAM runs at a frequency of 1125 MHz on this particular model. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon R9 M265X should in theory be quite a bit better than the GeForce 825M in general. (explain)

Radeon R9 M265X		72000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 57600 (400%)

Texel Rate

The Radeon R9 M265X is quite a bit (more or less 69%) faster with regards to anisotropic filtering than the GeForce 825M. (explain)

Radeon R9 M265X		23000 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 9400 (69%)

Pixel Rate

The Radeon R9 M265X should be a lot (more or less 35%) more effective at AA than the GeForce 825M, and capable of handling higher resolutions while still performing well. (explain)

Radeon R9 M265X		9200 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 2400 (35%)

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 (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel 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 ability to get to the maximum fill rate.