GeForce 820M vs Radeon R9 270

Intro

Compare those specifications to the Radeon R9 270, which has GPU clock speed of 900 MHz, and 2048 MB of GDDR5 RAM set to run at 1400 MHz through a 256-bit bus. It also is made up of 1280 Stream Processors, 80 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 270		5943 points
GeForce 820M		850 points
	Difference: 5093 (599%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon R9 270		150 Watts
	Difference: 135 Watts (900%)

Memory Bandwidth

In theory, the Radeon R9 270 should be 1020% quicker than the GeForce 820M overall, because of its greater bandwidth. (explain)

Radeon R9 270		179200 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 163200 (1020%)

Texel Rate

The Radeon R9 270 should be a lot (about 526%) more effective at texture filtering than the GeForce 820M. (explain)

Radeon R9 270		72000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 60496 (526%)

Pixel Rate

The Radeon R9 270 will be quite a bit (more or less 901%) faster with regards to FSAA than the GeForce 820M, and able to handle higher resolutions better. (explain)

Radeon R9 270		28800 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 25924 (901%)

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 (measured in megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's 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 processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.