Radeon HD 4650 512MB vs Radeon HD 5830

Intro

Compare that to the Radeon HD 5830, which has GPU clock speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also is comprised 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 4650 512MB		55 Watts
Radeon HD 5830		175 Watts
	Difference: 120 Watts (218%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5830 should be a lot faster than the Radeon HD 4650 512MB in general. (explain)

Radeon HD 5830		128000 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 112000 (700%)

Texel Rate

The Radeon HD 5830 will be much (approximately 133%) faster with regards to anisotropic filtering than the Radeon HD 4650 512MB. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 25600 (133%)

Pixel Rate

The Radeon HD 5830 will be much (about 167%) more effective at AA than the Radeon HD 4650 512MB, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 5830		12800 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 8000 (167%)

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 (in units of megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.