GeForce GTX 650 Ti vs Radeon HD 4790

Intro

Compare those specs to the Radeon HD 4790, which comes with GPU core speed of 600 MHz, and 512 MB of GDDR5 RAM running at 800 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4790 should be a bit faster than the GeForce GTX 650 Ti overall. (explain)

Radeon HD 4790		102400 MB/sec
GeForce GTX 650 Ti		86400 MB/sec
	Difference: 16000 (19%)

Texel Rate

The GeForce GTX 650 Ti is much (more or less 209%) more effective at anisotropic filtering than the Radeon HD 4790. (explain)

GeForce GTX 650 Ti		59392 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 40192 (209%)

Pixel Rate

The GeForce GTX 650 Ti should be quite a bit (more or less 55%) more effective at anti-aliasing than the Radeon HD 4790, and will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 650 Ti		14848 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 5248 (55%)

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 data (counted in megabytes per second) that can be transported past the external memory interface in a second. It 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 once again. If it uses DDR5, multiply by 4 instead. The better the card's 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 number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.