GeForce 830M vs Radeon R9 270

Intro

Compare those specifications to the Radeon R9 270, which comes with a GPU core clock speed of 900 MHz, and 2048 MB of GDDR5 memory running at 1400 MHz through a 256-bit bus. It also features 1280 Stream Processors, 80 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Radeon R9 270		150 Watts
	Difference: 125 Watts (500%)

Memory Bandwidth

In theory, the Radeon R9 270 is 1144% faster than the GeForce 830M overall, because of its higher bandwidth. (explain)

Radeon R9 270		179200 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 164800 (1144%)

Texel Rate

The Radeon R9 270 should be a lot (more or less 337%) faster with regards to anisotropic filtering than the GeForce 830M. (explain)

Radeon R9 270		72000 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 55536 (337%)

Pixel Rate

The Radeon R9 270 should be a lot (about 250%) better at full screen anti-aliasing than the GeForce 830M, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 270		28800 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 20568 (250%)

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 max amount of information (counted in megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it must 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 texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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