GeForce 820M vs Radeon HD 4650 1GB

Intro

Compare those specs to the Radeon HD 4650 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR3 memory works at a frequency of 700 MHz on this model. It features 320(64x5) SPUs along with 32 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 4650 1GB		55 Watts
	Difference: 40 Watts (267%)

Memory Bandwidth

Theoretically, the Radeon HD 4650 1GB should be a lot faster than the GeForce 820M overall. (explain)

Radeon HD 4650 1GB		22400 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 6400 (40%)

Texel Rate

The Radeon HD 4650 1GB is much (more or less 67%) more effective at anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 7696 (67%)

Pixel Rate

The Radeon HD 4650 1GB is quite a bit (approximately 67%) better at AA than the GeForce 820M, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4650 1GB		4800 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 1924 (67%)

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 data (in units of MB per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.