GeForce 840M vs Radeon HD 4550 256MB

Intro

Compare those specs to the Radeon HD 4550 256MB, which features GPU core speed of 600 MHz, and 256 MB of DDR3 memory running at 800 MHz through a 64-bit bus. It also features 80(16x5) SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 256MB		25 Watts
GeForce 840M		30 Watts
	Difference: 5 Watts (20%)

Memory Bandwidth

As far as performance goes, the GeForce 840M should in theory be much superior to the Radeon HD 4550 256MB overall. (explain)

GeForce 840M		16000 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The GeForce 840M will be much (more or less 415%) better at AF than the Radeon HD 4550 256MB. (explain)

GeForce 840M		24696 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 19896 (415%)

Pixel Rate

The GeForce 840M will be much (about 243%) faster with regards to FSAA than the Radeon HD 4550 256MB, and should be capable of handling higher screen resolutions more effectively. (explain)

GeForce 840M		8232 Mpixels/sec
Radeon HD 4550 256MB		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: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's 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 number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per 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 calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.