Radeon HD 4830 1GB vs Radeon HD 5830

Intro

Compare all of that to the Radeon HD 5830, which has a core clock speed of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is made up of 1120(224x5) SPUs, 56 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
Radeon HD 5830		175 Watts
	Difference: 80 Watts (84%)

Memory Bandwidth

In theory, the Radeon HD 5830 is 122% faster than the Radeon HD 4830 1GB overall, because of its greater data rate. (explain)

Radeon HD 5830		128000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 70400 (122%)

Texel Rate

The Radeon HD 5830 is quite a bit (approximately 143%) better at AF than the Radeon HD 4830 1GB. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 26400 (143%)

Pixel Rate

The Radeon HD 5830 will be a lot (about 39%) faster with regards to full screen anti-aliasing than the Radeon HD 4830 1GB, and will be able to handle higher resolutions more effectively. (explain)

Radeon HD 5830		12800 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 3600 (39%)

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 information (counted in megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, it must 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

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