GeForce GTX 660 Ti vs Radeon HD 4790

Intro

Compare those specifications to the Radeon HD 4790, which makes use of a 55 nm design. AMD has clocked the core frequency at 600 MHz. The GDDR5 RAM runs at a frequency of 800 MHz on this card. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 Ti should perform a lot faster than the Radeon HD 4790 overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon HD 4790		102400 MB/sec
	Difference: 41600 (41%)

Texel Rate

The GeForce GTX 660 Ti should be a lot (approximately 434%) more effective at AF than the Radeon HD 4790. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 83280 (434%)

Pixel Rate

The GeForce GTX 660 Ti is quite a bit (approximately 129%) faster with regards to full screen anti-aliasing than the Radeon HD 4790, and capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 12360 (129%)

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 largest amount of data (counted in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs 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 also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.