GeForce GTX 560 vs Radeon HD 4830 512MB

Intro

Compare all that to the Radeon HD 4830 512MB, which comes with GPU 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 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
GeForce GTX 560		150 Watts
	Difference: 55 Watts (58%)

Memory Bandwidth

The GeForce GTX 560 should theoretically be much faster than the Radeon HD 4830 512MB overall. (explain)

GeForce GTX 560		128128 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 70528 (122%)

Texel Rate

The GeForce GTX 560 is a lot (more or less 147%) better at texture filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 560		45360 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 26960 (147%)

Pixel Rate

The GeForce GTX 560 is much (more or less 182%) more effective at anti-aliasing than the Radeon HD 4830 512MB, and capable of handling higher screen resolutions better. (explain)

GeForce GTX 560		25920 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 16720 (182%)

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 (in units of megabytes per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.