GeForce 920M vs Radeon HD 4850 X2 512MB

Intro

Compare all that to the Radeon HD 4850 X2 512MB, which comes with a clock frequency of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4850 X2 512MB should be quite a bit faster than the GeForce 920M overall. (explain)

Radeon HD 4850 X2 512MB		127104 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 112704 (783%)

Texel Rate

The Radeon HD 4850 X2 512MB will be much (approximately 64%) faster with regards to texture filtering than the GeForce 920M. (explain)

Radeon HD 4850 X2 512MB		50000 Mtexels/sec
GeForce 920M		30528 Mtexels/sec
	Difference: 19472 (64%)

Pixel Rate

The Radeon HD 4850 X2 512MB will be quite a bit (more or less 162%) more effective at full screen anti-aliasing than the GeForce 920M, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 512MB		20000 Mpixels/sec
GeForce 920M		7632 Mpixels/sec
	Difference: 12368 (162%)

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: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.