GeForce GTX 560 Ti 448 vs Radeon HD 4830 1GB

Intro

Compare all of that to the Radeon HD 4830 1GB, which comes with a core clock speed of 575 MHz and a GDDR4 memory speed of 900 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is comprised of 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 1GB		95 Watts
GeForce GTX 560 Ti 448		210 Watts
	Difference: 115 Watts (121%)

Memory Bandwidth

The GeForce GTX 560 Ti 448, in theory, should be much faster than the Radeon HD 4830 1GB overall. (explain)

GeForce GTX 560 Ti 448		144000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 86400 (150%)

Texel Rate

The GeForce GTX 560 Ti 448 will be much (more or less 123%) better at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

GeForce GTX 560 Ti 448		40992 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 22592 (123%)

Pixel Rate

The GeForce GTX 560 Ti 448 will be quite a bit (about 218%) faster with regards to AA than the Radeon HD 4830 1GB, and also should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 560 Ti 448		29280 Mpixels/sec
Radeon HD 4830 1GB		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 largest amount of data (measured in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen 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 number of texture units by the core clock 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 the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.