GeForce 920M vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 975 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 4890 1GB should theoretically be quite a bit superior to the GeForce 920M overall. (explain)

Radeon HD 4890 1GB		124800 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 110400 (767%)

Texel Rate

The Radeon HD 4890 1GB should be a lot (approximately 31%) faster with regards to anisotropic filtering than the GeForce 920M. (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
GeForce 920M		30528 Mtexels/sec
	Difference: 9472 (31%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4890 1GB is a better choice, and very much so. (explain)

Radeon HD 4890 1GB		16000 Mpixels/sec
GeForce 920M		7632 Mpixels/sec
	Difference: 8368 (110%)

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: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.