GeForce 820M vs Radeon HD 4730

Intro

Compare those specs to the Radeon HD 4730, which features clock speeds of 700 MHz on the GPU, and 900 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 32 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 4730		140 Watts
	Difference: 125 Watts (833%)

Memory Bandwidth

In theory, the Radeon HD 4730 is 260% quicker than the GeForce 820M in general, due to its greater bandwidth. (explain)

Radeon HD 4730		57600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The Radeon HD 4730 will be a lot (approximately 95%) more effective at texture filtering than the GeForce 820M. (explain)

Radeon HD 4730		22400 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 10896 (95%)

Pixel Rate

The Radeon HD 4730 is much (about 95%) faster with regards to AA than the GeForce 820M, and able to handle higher screen resolutions better. (explain)

Radeon HD 4730		5600 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 2724 (95%)

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 largest amount of data (in units of MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 are applied in one second. This number is worked out by multiplying the total number of texture units 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.