GeForce GTX 480 vs Radeon HD 4830 512MB

Intro

Compare those specs to the Radeon HD 4830 512MB, which has a GPU core clock speed of 575 MHz, and 512 MB of GDDR3 memory running at 900 MHz through a 256-bit bus. It also features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
GeForce GTX 480		250 Watts
	Difference: 155 Watts (163%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 480 should perform a lot faster than the Radeon HD 4830 512MB overall. (explain)

GeForce GTX 480		177408 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 119808 (208%)

Texel Rate

The GeForce GTX 480 will be much (about 128%) faster with regards to AF than the Radeon HD 4830 512MB. (explain)

GeForce GTX 480		42000 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 23600 (128%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 480 is a better choice, by far. (explain)

GeForce GTX 480		33600 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 24400 (265%)

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 data (counted in MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called 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 ability to reach the maximum fill rate.