GeForce 820M vs Radeon HD 3850 X2

Intro

Compare all that to the Radeon HD 3850 X2, which features core clock speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs along with 16 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 X2 should theoretically perform quite a bit faster than the GeForce 820M overall. (explain)

Radeon HD 3850 X2		105984 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 89984 (562%)

Texel Rate

The Radeon HD 3850 X2 is quite a bit (about 86%) more effective at texture filtering than the GeForce 820M. (explain)

Radeon HD 3850 X2		21376 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 9872 (86%)

Pixel Rate

The Radeon HD 3850 X2 is a lot (approximately 643%) better at AA than the GeForce 820M, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 18500 (643%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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