GeForce GTX 650 Ti 2GB vs Radeon HD 4790

Intro

Compare those specs to the Radeon HD 4790, which comes with core clock speeds of 600 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 4790 should theoretically be a small bit better than the GeForce GTX 650 Ti 2GB overall. (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 much (approximately 209%) faster with regards to anisotropic 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 should be a lot (about 55%) more effective at anti-aliasing than the Radeon HD 4790, and also capable of handling higher screen resolutions better. (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 max amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the video 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 graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. 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 output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.