GeForce GTX 650 Ti 2GB vs Radeon HD 4790

Intro

Compare all of that to the Radeon HD 4790, which features a core clock speed of 600 MHz and a GDDR5 memory frequency of 800 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4790 will be 19% quicker than the GeForce GTX 650 Ti 2GB in general, due to its greater bandwidth. (explain)

Radeon HD 4790		102400 MB/sec
GeForce GTX 650 Ti 2GB		86400 MB/sec
	Difference: 16000 (19%)

Texel Rate

The GeForce GTX 650 Ti 2GB will be quite a bit (more or less 209%) better at texture filtering than the Radeon HD 4790. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 40192 (209%)

Pixel Rate

The GeForce GTX 650 Ti 2GB will be a lot (about 55%) faster with regards to FSAA than the Radeon HD 4790, and should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 650 Ti 2GB		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: Bandwidth is the maximum amount of information (counted in MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.