GeForce 820M vs Radeon HD 5770

Intro

Compare those specifications to the Radeon HD 5770, which comes with GPU core speed of 850 MHz, and 1024 MB of GDDR5 RAM set to run at 1200 MHz through a 128-bit bus. It also is made up of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 5770		108 Watts
	Difference: 93 Watts (620%)

Memory Bandwidth

The Radeon HD 5770 should in theory be quite a bit faster than the GeForce 820M in general. (explain)

Radeon HD 5770		76800 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 60800 (380%)

Texel Rate

The Radeon HD 5770 will be a lot (more or less 196%) faster with regards to AF than the GeForce 820M. (explain)

Radeon HD 5770		34000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 22496 (196%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5770 is superior to the GeForce 820M, and very much so. (explain)

Radeon HD 5770		13600 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 10724 (373%)

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 max amount of information (counted in MB per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

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