GeForce GT 340 1GB vs Radeon HD 4790

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4790, in theory, should perform quite a bit faster than the GeForce GT 340 1GB overall. (explain)

Radeon HD 4790		102400 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 48000 (88%)

Texel Rate

The Radeon HD 4790 is a little bit (about 9%) more effective at AF than the GeForce GT 340 1GB. (explain)

Radeon HD 4790		19200 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 1600 (9%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4790 is superior to the GeForce GT 340 1GB, and very much so. (explain)

Radeon HD 4790		9600 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 5200 (118%)

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 MB per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.