GeForce GTX 880M vs Radeon HD 4790

Intro

Compare all of 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 as well as 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce GTX 880M should theoretically be a lot better than the Radeon HD 4790 in general. (explain)

GeForce GTX 880M		128000 MB/sec
Radeon HD 4790		102400 MB/sec
	Difference: 25600 (25%)

Texel Rate

The GeForce GTX 880M will be much (about 536%) faster with regards to texture filtering than the Radeon HD 4790. (explain)

GeForce GTX 880M		122112 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 102912 (536%)

Pixel Rate

The GeForce GTX 880M is a lot (more or less 218%) faster with regards to full screen anti-aliasing than the Radeon HD 4790, and also will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 880M		30528 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 20928 (218%)

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 (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's 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 number 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 clock speed of the chip. The higher this number, the better the 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 maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs 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 rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.