GeForce 830M vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has set the core speed at 1050 MHz. The GDDR5 RAM works at a speed of 1500 MHz on this particular model. It features 2816 SPUs as well as 176 TAUs and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 250 Watts (1000%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G should perform a lot faster than the GeForce 830M in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 369600 (2567%)

Texel Rate

The Radeon R9 390X 8G will be much (approximately 1022%) better at texture filtering than the GeForce 830M. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 168336 (1022%)

Pixel Rate

The Radeon R9 390X 8G should be a lot (approximately 716%) better at full screen anti-aliasing than the GeForce 830M, and able to handle higher resolutions while still performing well. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 58968 (716%)

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 largest amount of information (counted in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

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