GeForce GTX 880M vs Radeon HD 4790

Intro

Compare all of that to the Radeon HD 4790, which makes use of a 55 nm design. AMD has set the core frequency at 600 MHz. The GDDR5 memory runs at a speed of 800 MHz on this particular card. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 880M should in theory perform much faster than the Radeon HD 4790 overall. (explain)

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

Texel Rate

The GeForce GTX 880M is much (approximately 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

If running with high levels of AA is important to you, then the GeForce GTX 880M is superior to the Radeon HD 4790, by far. (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 (in units of megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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