GeForce 840M vs Radeon HD 4550 256MB

Intro

Compare all of that to the Radeon HD 4550 256MB, which features a clock speed of 600 MHz and a DDR3 memory speed of 800 MHz. It also uses a 64-bit bus, and uses a 55 nm design. It features 80(16x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

Display Graphs

Hide Graphs

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

Theoretically, the GeForce 840M should perform much faster than 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 quite a bit (about 415%) more effective at anisotropic filtering 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 is quite a bit (more or less 243%) more effective at FSAA than the Radeon HD 4550 256MB, and also will be able to handle higher resolutions while still performing well. (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 max amount of information (measured in MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most 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 number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.