GeForce GTX 880M vs Radeon HD 4790

Intro

Compare that to the Radeon HD 4790, which has a clock speed of 600 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 880M should be 25% quicker than the Radeon HD 4790 in general, because of its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 880M will be a lot (more or less 536%) better at anisotropic filtering than the Radeon HD 4790. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 880M is the winner, and very much so. (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 maximum amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 are processed per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock 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 is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.