Radeon HD 4650 1GB vs Radeon HD 5830

Intro

Compare all of that to the Radeon HD 5830, which has a clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 256-bit bus, and uses a 40 nm design. It features 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 1GB		55 Watts
Radeon HD 5830		175 Watts
	Difference: 120 Watts (218%)

Memory Bandwidth

Theoretically, the Radeon HD 5830 should perform a lot faster than the Radeon HD 4650 1GB overall. (explain)

Radeon HD 5830		128000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 105600 (471%)

Texel Rate

The Radeon HD 5830 will be quite a bit (more or less 133%) more effective at anisotropic filtering than the Radeon HD 4650 1GB. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 25600 (133%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 5830 is superior to the Radeon HD 4650 1GB, by far. (explain)

Radeon HD 5830		12800 Mpixels/sec
Radeon HD 4650 1GB		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 max amount of information (counted in MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.