GeForce 920M vs Radeon HD 4870 512MB

Intro

Compare those specifications to the Radeon HD 4870 512MB, which comes with a GPU core clock speed of 750 MHz, and 512 MB of GDDR5 RAM running at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 4870 512MB should theoretically be much superior to 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 will be a small bit (approximately 2%) better at 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

The Radeon HD 4870 512MB should be quite a bit (about 57%) more effective at AA than the GeForce 920M, and capable of handling higher screen resolutions while still performing well. (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 maximum amount of information (counted in megabytes per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the 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 can be applied per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.