GeForce 830M vs Radeon R9 285

Intro

Compare all of that to the Radeon R9 285, which makes use of a 28 nm design. AMD has clocked the core speed at 918 MHz. The GDDR5 memory runs at a frequency of 1375 MHz on this model. It features 1792 SPUs as well as 112 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Radeon R9 285		190 Watts
	Difference: 165 Watts (660%)

Memory Bandwidth

As far as performance goes, the Radeon R9 285 should theoretically be quite a bit superior to the GeForce 830M overall. (explain)

Radeon R9 285		176000 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 161600 (1122%)

Texel Rate

The Radeon R9 285 will be quite a bit (approximately 524%) faster with regards to anisotropic filtering than the GeForce 830M. (explain)

Radeon R9 285		102816 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 86352 (524%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 285 is the winner, by a large margin. (explain)

Radeon R9 285		29376 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 21144 (257%)

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 (counted in megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied 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 video 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 most pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.