GeForce 825M vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which uses a 28 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 memory runs at a frequency of 1125 MHz on this model. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
Radeon R9 M275X		50 Watts
	Difference: 17 Watts (52%)

Memory Bandwidth

In theory, the Radeon R9 M275X should be quite a bit faster than the GeForce 825M in general. (explain)

Radeon R9 M275X		72000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 57600 (400%)

Texel Rate

The Radeon R9 M275X will be a lot (approximately 165%) faster with regards to AF than the GeForce 825M. (explain)

Radeon R9 M275X		36000 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 22400 (165%)

Pixel Rate

The Radeon R9 M275X is much (more or less 112%) faster with regards to anti-aliasing than the GeForce 825M, and also capable of handling higher screen resolutions better. (explain)

Radeon R9 M275X		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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.