GeForce 820M vs Radeon HD 4550 512MB

Intro

Compare those specs to the Radeon HD 4550 512MB, which features GPU core speed of 600 MHz, and 512 MB of GDDR3 memory set to run at 800 MHz through a 64-bit bus. It also features 80(16x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 4550 512MB		25 Watts
	Difference: 10 Watts (67%)

Memory Bandwidth

Theoretically, the GeForce 820M should be quite a bit faster than the Radeon HD 4550 512MB in general. (explain)

GeForce 820M		16000 MB/sec
Radeon HD 4550 512MB		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The GeForce 820M should be a lot (about 140%) more effective at anisotropic filtering than the Radeon HD 4550 512MB. (explain)

GeForce 820M		11504 Mtexels/sec
Radeon HD 4550 512MB		4800 Mtexels/sec
	Difference: 6704 (140%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce 820M is a better choice, but not by far. (explain)

GeForce 820M		2876 Mpixels/sec
Radeon HD 4550 512MB		2400 Mpixels/sec
	Difference: 476 (20%)

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 largest amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, 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 number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher 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 video card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.