GeForce GT 450 (OEM) vs Radeon HD 4790

Intro

Compare all of that 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 speed of 800 MHz on this card. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4790 will be 7% quicker than the GeForce GT 450 (OEM) overall, because of its greater data rate. (explain)

Radeon HD 4790		102400 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 6400 (7%)

Texel Rate

The Radeon HD 4790 should be a small bit (approximately 1%) more effective at anisotropic filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 4790		19200 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 240 (1%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GT 450 (OEM) is superior to the Radeon HD 4790, by far. (explain)

GeForce GT 450 (OEM)		18960 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 9360 (98%)

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 megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.