GeForce 820M vs Radeon HD 4830 1GB

Intro

Compare those specifications to the Radeon HD 4830 1GB, which uses a 55 nm design. AMD has set the core speed at 575 MHz. The GDDR4 memory works at a frequency of 900 MHz on this particular model. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 80 Watts (533%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4830 1GB should theoretically be a lot better than the GeForce 820M overall. (explain)

Radeon HD 4830 1GB		57600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The Radeon HD 4830 1GB should be much (about 60%) better at texture filtering than the GeForce 820M. (explain)

Radeon HD 4830 1GB		18400 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 6896 (60%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4830 1GB is a better choice, by far. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 6324 (220%)

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 maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total number of texture units by the core clock 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.