GeForce 825M vs Radeon R9 380X

Intro

Compare those specifications to the Radeon R9 380X, which makes use of a 28 nm design. AMD has clocked the core frequency at 970 MHz. The GDDR5 RAM works at a frequency of 1425 MHz on this model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
Radeon R9 380X		190 Watts
	Difference: 157 Watts (476%)

Memory Bandwidth

In theory, the Radeon R9 380X is 1167% quicker than the GeForce 825M in general, due to its higher data rate. (explain)

Radeon R9 380X		182400 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 168000 (1167%)

Texel Rate

The Radeon R9 380X should be quite a bit (about 813%) better at texture filtering than the GeForce 825M. (explain)

Radeon R9 380X		124160 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 110560 (813%)

Pixel Rate

The Radeon R9 380X will be a lot (approximately 356%) more effective at AA than the GeForce 825M, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 380X		31040 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 24240 (356%)

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 moved across the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better this number, 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 maximum number of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number 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 is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.