GeForce 920M vs Radeon HD 3850 X2

Intro

Compare that to the Radeon HD 3850 X2, which comes with core speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3850 X2 will be 636% faster than the GeForce 920M in general, because of its greater bandwidth. (explain)

Radeon HD 3850 X2		105984 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 91584 (636%)

Texel Rate

The GeForce 920M will be much (about 43%) more effective at AF than the Radeon HD 3850 X2. (explain)

GeForce 920M		30528 Mtexels/sec
Radeon HD 3850 X2		21376 Mtexels/sec
	Difference: 9152 (43%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 3850 X2 is superior to the GeForce 920M, by a large margin. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
GeForce 920M		7632 Mpixels/sec
	Difference: 13744 (180%)

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 maximum amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, it 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total amount of texture units by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.