GeForce 830M vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Radeon R9 M390X		125 Watts
	Difference: 100 Watts (400%)

Memory Bandwidth

The Radeon R9 M390X should theoretically perform much faster than the GeForce 830M overall. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 145600 (1011%)

Texel Rate

The Radeon R9 M390X will be much (more or less 462%) better at anisotropic filtering than the GeForce 830M. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 76080 (462%)

Pixel Rate

The Radeon R9 M390X will be quite a bit (more or less 181%) faster with regards to full screen anti-aliasing than the GeForce 830M, and also capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 14904 (181%)

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 MB per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

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