GeForce 920M vs Radeon HD 4870 512MB

Intro

Compare those specs to the Radeon HD 4870 512MB, which features core clock speeds of 750 MHz on the GPU, and 900 MHz on the 512 MB of GDDR5 RAM. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4870 512MB should in theory be a lot faster than the GeForce 920M overall. (explain)

Radeon HD 4870 512MB		115200 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 100800 (700%)

Texel Rate

The GeForce 920M is a little bit (more or less 2%) faster with regards to anisotropic filtering than the Radeon HD 4870 512MB. (explain)

GeForce 920M		30528 Mtexels/sec
Radeon HD 4870 512MB		30000 Mtexels/sec
	Difference: 528 (2%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4870 512MB is the winner, and very much so. (explain)

Radeon HD 4870 512MB		12000 Mpixels/sec
GeForce 920M		7632 Mpixels/sec
	Difference: 4368 (57%)

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: Bandwidth is the largest amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the card's 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 bandwidth is, the lower the potential to reach the maximum fill rate.