GeForce 820M vs Radeon R9 M280X

Intro

Compare those specs to the Radeon R9 M280X, which features core clock speeds of 900 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon R9 M280X		75 Watts
	Difference: 60 Watts (400%)

Memory Bandwidth

The Radeon R9 M280X should in theory be quite a bit faster than the GeForce 820M overall. (explain)

Radeon R9 M280X		88000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 72000 (450%)

Texel Rate

The Radeon R9 M280X will be much (about 338%) faster with regards to AF than the GeForce 820M. (explain)

Radeon R9 M280X		50400 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 38896 (338%)

Pixel Rate

The Radeon R9 M280X should be a lot (approximately 401%) faster with regards to FSAA than the GeForce 820M, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 M280X		14400 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 11524 (401%)

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: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total texture units of the card by the core 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.