GeForce GTX 560 Ti 448 vs Radeon HD 4830 512MB

Intro

Compare all that to the Radeon HD 4830 512MB, which has a core clock frequency of 575 MHz and a GDDR3 memory speed of 900 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, 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 560 Ti 448		210 Watts
	Difference: 115 Watts (121%)

Memory Bandwidth

In theory, the GeForce GTX 560 Ti 448 should be a lot faster than the Radeon HD 4830 512MB in general. (explain)

GeForce GTX 560 Ti 448		144000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 86400 (150%)

Texel Rate

The GeForce GTX 560 Ti 448 is much (about 123%) more effective at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 560 Ti 448		40992 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 22592 (123%)

Pixel Rate

The GeForce GTX 560 Ti 448 is much (more or less 218%) more effective at anti-aliasing than the Radeon HD 4830 512MB, and will be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 560 Ti 448		29280 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 20080 (218%)

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 maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.