GeForce 820M vs Radeon HD 4550 512MB

Intro

Compare those specs to the Radeon HD 4550 512MB, which features a core clock speed of 600 MHz and a GDDR3 memory speed of 800 MHz. It also features a 64-bit bus, and makes use of a 55 nm design. It features 80(16x5) SPUs, 8 TAUs, and 4 ROPs.

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 speaking, the GeForce 820M should be much faster than the Radeon HD 4550 512MB overall. (explain)

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

Texel Rate

The GeForce 820M should be much (about 140%) better at texture 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 it probably won't make a huge difference. (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: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. 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 also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.