GeForce 820M vs Radeon HD 4550 256MB

Intro

Compare all of that to the Radeon HD 4550 256MB, which makes use of a 55 nm design. AMD has clocked the core speed at 600 MHz. The DDR3 memory runs at a speed of 800 MHz on this specific card. It features 80(16x5) SPUs along with 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 256MB		25 Watts
	Difference: 10 Watts (67%)

Memory Bandwidth

Performance-wise, the GeForce 820M should theoretically be much superior to the Radeon HD 4550 256MB in general. (explain)

GeForce 820M		16000 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The GeForce 820M will be much (more or less 140%) more effective at texture filtering than the Radeon HD 4550 256MB. (explain)

GeForce 820M		11504 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 6704 (140%)

Pixel Rate

The GeForce 820M is just a bit (more or less 20%) more effective at FSAA than the Radeon HD 4550 256MB, and also will be able to handle higher resolutions better. (explain)

GeForce 820M		2876 Mpixels/sec
Radeon HD 4550 256MB		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 max amount of information (in units of megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 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 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 the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of 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.