GeForce 830M vs Radeon HD 4790

Intro

Compare all that to the Radeon HD 4790, which features clock speeds of 600 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4790 should theoretically perform a lot faster than the GeForce 830M in general. (explain)

Radeon HD 4790		102400 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 88000 (611%)

Texel Rate

The Radeon HD 4790 is just a bit (approximately 17%) better at anisotropic filtering than the GeForce 830M. (explain)

Radeon HD 4790		19200 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 2736 (17%)

Pixel Rate

The Radeon HD 4790 should be a little bit (approximately 17%) more effective at full screen anti-aliasing than the GeForce 830M, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4790		9600 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 1368 (17%)

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 largest amount of information (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units by the core 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 one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.