GeForce 820M vs Radeon RX 480 4GB

Intro

Compare that to the Radeon RX 480 4GB, which has clock speeds of 1120 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 memory. It features 2304 SPUs as well as 144 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon RX 480 4GB		150 Watts
	Difference: 135 Watts (900%)

Memory Bandwidth

In theory, the Radeon RX 480 4GB should be 1334% quicker than the GeForce 820M overall, because of its higher bandwidth. (explain)

Radeon RX 480 4GB		229376 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 213376 (1334%)

Texel Rate

The Radeon RX 480 4GB should be quite a bit (about 1302%) more effective at AF than the GeForce 820M. (explain)

Radeon RX 480 4GB		161280 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 149776 (1302%)

Pixel Rate

The Radeon RX 480 4GB will be a lot (more or less 1146%) better at anti-aliasing than the GeForce 820M, and also will be capable of handling higher resolutions while still performing well. (explain)

Radeon RX 480 4GB		35840 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 32964 (1146%)

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 largest amount of data (measured in MB per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. 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 in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.