GeForce 840M vs Radeon HD 4850 512MB

Intro

Compare that to the Radeon HD 4850 512MB, which has GPU core speed of 625 MHz, and 512 MB of GDDR3 memory set to run at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
Radeon HD 4850 512MB		110 Watts
	Difference: 80 Watts (267%)

Memory Bandwidth

The Radeon HD 4850 512MB should theoretically be quite a bit faster than the GeForce 840M in general. (explain)

Radeon HD 4850 512MB		63552 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 47552 (297%)

Texel Rate

The Radeon HD 4850 512MB will be a little bit (approximately 1%) more effective at AF than the GeForce 840M. (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 304 (1%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4850 512MB is superior to the GeForce 840M, by far. (explain)

Radeon HD 4850 512MB		10000 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 1768 (21%)

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 data (in units of megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.