GeForce 840M vs Radeon HD 4550 512MB

Intro

Compare those specs to the Radeon HD 4550 512MB, which features core speeds of 600 MHz on the GPU, and 800 MHz on the 512 MB of GDDR3 RAM. It features 80(16x5) SPUs as well as 8 TAUs and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB		25 Watts
GeForce 840M		30 Watts
	Difference: 5 Watts (20%)

Memory Bandwidth

The GeForce 840M, in theory, should perform quite a bit faster than the Radeon HD 4550 512MB overall. (explain)

GeForce 840M		16000 MB/sec
Radeon HD 4550 512MB		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The GeForce 840M will be quite a bit (more or less 415%) more effective at texture filtering than the Radeon HD 4550 512MB. (explain)

GeForce 840M		24696 Mtexels/sec
Radeon HD 4550 512MB		4800 Mtexels/sec
	Difference: 19896 (415%)

Pixel Rate

The GeForce 840M is a lot (more or less 243%) more effective at FSAA than the Radeon HD 4550 512MB, and also should be capable of handling higher resolutions better. (explain)

GeForce 840M		8232 Mpixels/sec
Radeon HD 4550 512MB		2400 Mpixels/sec
	Difference: 5832 (243%)

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 transferred past 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, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the 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 - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.