GeForce 820M vs Radeon R9 M295X

Intro

Compare that to the Radeon R9 M295X, which comes with a clock speed of 750 MHz and a GDDR5 memory speed of 1375 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon R9 M295X		125 Watts
	Difference: 110 Watts (733%)

Memory Bandwidth

The Radeon R9 M295X should theoretically be a lot faster than the GeForce 820M in general. (explain)

Radeon R9 M295X		176000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 160000 (1000%)

Texel Rate

The Radeon R9 M295X should be quite a bit (about 734%) faster with regards to texture filtering than the GeForce 820M. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 84496 (734%)

Pixel Rate

The Radeon R9 M295X should be quite a bit (approximately 734%) more effective at AA than the GeForce 820M, and should be capable of handling higher screen resolutions better. (explain)

Radeon R9 M295X		24000 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 21124 (734%)

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 megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.