Geforce GTX 680 vs Radeon HD 4830 1GB

Intro

Compare all of that to the Radeon HD 4830 1GB, which features a GPU core clock speed of 575 MHz, and 1024 MB of GDDR4 RAM running at 900 MHz through a 256-bit bus. It also features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
Geforce GTX 680		195 Watts
	Difference: 100 Watts (105%)

Memory Bandwidth

The Geforce GTX 680, in theory, should perform much faster than the Radeon HD 4830 1GB overall. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 134656 (234%)

Texel Rate

The Geforce GTX 680 should be quite a bit (approximately 600%) more effective at AF than the Radeon HD 4830 1GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 110368 (600%)

Pixel Rate

If running with high levels of AA is important to you, then the Geforce GTX 680 is a better choice, by far. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 22992 (250%)

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 information (in units of megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.