GeForce 820M vs Radeon R9 M365X

Intro

Compare those specifications to the Radeon R9 M365X, which comes with core clock speeds of 925 MHz on the GPU, and 1125 MHz on the 4096 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M365X will be 350% faster than the GeForce 820M overall, due to its greater data rate. (explain)

Radeon R9 M365X		72000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 56000 (350%)

Texel Rate

The Radeon R9 M365X will be a lot (about 222%) better at anisotropic filtering than the GeForce 820M. (explain)

Radeon R9 M365X		37000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 25496 (222%)

Pixel Rate

The Radeon R9 M365X will be a lot (more or less 415%) better at FSAA than the GeForce 820M, and will be capable of handling higher screen resolutions better. (explain)

Radeon R9 M365X		14800 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 11924 (415%)

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 data (counted in megabytes per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units by the core 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 video card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.