Radeon HD 5450 vs Radeon HD 5830

Intro

Compare all of that to the Radeon HD 5830, which comes with a core clock speed of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is made up of 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 5450		19 Watts
Radeon HD 5830		175 Watts
	Difference: 156 Watts (821%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5830 will be 900% faster than the Radeon HD 5450 overall, due to its higher bandwidth. (explain)

Radeon HD 5830		128000 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 115200 (900%)

Texel Rate

The Radeon HD 5830 will be a lot (approximately 762%) more effective at AF than the Radeon HD 5450. (explain)

Radeon HD 5830		44800 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 39600 (762%)

Pixel Rate

The Radeon HD 5830 will be much (about 392%) better at full screen anti-aliasing than the Radeon HD 5450, and also able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 5830		12800 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 10200 (392%)

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 largest amount of information (counted in megabytes per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses 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 amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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 potential to get to the maximum fill rate.