GeForce 825M vs Radeon R9 M265X

Intro

Compare all of that to the Radeon R9 M265X, which uses a 28 nm design. AMD has set the core frequency at 575 MHz. The GDDR5 RAM is set to run 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

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R9 M265X should theoretically be quite a bit better than the GeForce 825M overall. (explain)

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

Texel Rate

The Radeon R9 M265X will be quite a bit (more or less 69%) more effective at AF 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 will be a lot (approximately 35%) more effective at anti-aliasing than the GeForce 825M, and able to handle higher screen resolutions without slowing down too much. (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 data (counted in MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the 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 maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). 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 maximum fill rate.