GeForce GTX 550 Ti vs Radeon HD 4790

Intro

Compare those specs to the Radeon HD 4790, which comes with a clock speed of 600 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4790 should perform a bit faster than the GeForce GTX 550 Ti overall. (explain)

Radeon HD 4790		102400 MB/sec
GeForce GTX 550 Ti		98496 MB/sec
	Difference: 3904 (4%)

Texel Rate

The GeForce GTX 550 Ti should be much (about 50%) faster with regards to texture filtering than the Radeon HD 4790. (explain)

GeForce GTX 550 Ti		28800 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 9600 (50%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 550 Ti is superior to the Radeon HD 4790, by far. (explain)

GeForce GTX 550 Ti		21600 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 12000 (125%)

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 moved across the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If 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 can be processed per second. This number is worked out by multiplying the total texture units 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.