Radeon HD 4830 512MB vs Radeon HD 5450

Intro

Compare those specs to the Radeon HD 5450, which uses a 40 nm design. AMD has set the core speed at 650 MHz. The DDR3 RAM works at a speed of 800 MHz on this specific model. It features 80(16x5) SPUs as well as 8 Texture Address Units and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 76 Watts (400%)

Memory Bandwidth

Performance-wise, the Radeon HD 4830 512MB should theoretically be much superior to the Radeon HD 5450 in general. (explain)

Radeon HD 4830 512MB		57600 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 44800 (350%)

Texel Rate

The Radeon HD 4830 512MB is quite a bit (approximately 254%) better at texture filtering than the Radeon HD 5450. (explain)

Radeon HD 4830 512MB		18400 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 13200 (254%)

Pixel Rate

The Radeon HD 4830 512MB should be quite a bit (approximately 254%) better at full screen anti-aliasing than the Radeon HD 5450, and will be capable of handling higher screen resolutions better. (explain)

Radeon HD 4830 512MB		9200 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 6600 (254%)

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 across the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.