Radeon HD 4850 2GB vs Radeon HD 5830

Intro

Compare all that to the Radeon HD 5830, which has a clock speed of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It features 1120(224x5) SPUs, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB		110 Watts
Radeon HD 5830		175 Watts
	Difference: 65 Watts (59%)

Memory Bandwidth

Performance-wise, the Radeon HD 5830 should theoretically be much better than the Radeon HD 4850 2GB in general. (explain)

Radeon HD 5830		128000 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 64448 (101%)

Texel Rate

The Radeon HD 5830 is a lot (about 79%) better at AF than the Radeon HD 4850 2GB. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 19800 (79%)

Pixel Rate

The Radeon HD 5830 is much (more or less 28%) faster with regards to AA than the Radeon HD 4850 2GB, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 5830		12800 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 2800 (28%)

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 largest amount of information (counted in MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.