Geforce GTX 670 vs Radeon HD 4790

Intro

Compare all of that to the Radeon HD 4790, which uses a 55 nm design. AMD has clocked the core frequency at 600 MHz. The GDDR5 RAM is set to run at a frequency of 800 MHz on this specific model. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Geforce GTX 670 should be much faster than the Radeon HD 4790 in general. (explain)

Geforce GTX 670		192000 MB/sec
Radeon HD 4790		102400 MB/sec
	Difference: 89600 (88%)

Texel Rate

The Geforce GTX 670 is much (more or less 434%) better at texture filtering than the Radeon HD 4790. (explain)

Geforce GTX 670		102480 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 83280 (434%)

Pixel Rate

The Geforce GTX 670 will be much (approximately 205%) better at FSAA than the Radeon HD 4790, and able to handle higher resolutions while still performing well. (explain)

Geforce GTX 670		29280 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 19680 (205%)

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 max amount of data (counted in megabytes per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, the result 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 anti-aliasing, HDR 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 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 the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.