Radeon HD 4650 512MB vs Radeon HD 5830

Intro

Compare all that to the Radeon HD 5830, which comes with clock speeds of 800 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 1120(224x5) SPUs as well as 56 TAUs 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

Performance-wise, the Radeon HD 5830 should theoretically be quite a bit superior to 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 (more or less 133%) more effective at 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 5830 is superior to the Radeon HD 4650 512MB, and very much so. (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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.