Radeon HD 4830 1GB vs Radeon HD 5450

Intro

Compare all of that to the Radeon HD 5450, which makes use of a 40 nm design. AMD has set the core frequency at 650 MHz. The DDR3 memory is set to run at a frequency of 800 MHz on this particular card. It features 80(16x5) SPUs along with 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 76 Watts (400%)

Memory Bandwidth

Theoretically, the Radeon HD 4830 1GB should perform a lot faster than the Radeon HD 5450 overall. (explain)

Radeon HD 4830 1GB		57600 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 44800 (350%)

Texel Rate

The Radeon HD 4830 1GB is much (about 254%) faster with regards to texture filtering than the Radeon HD 5450. (explain)

Radeon HD 4830 1GB		18400 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 13200 (254%)

Pixel Rate

The Radeon HD 4830 1GB should be quite a bit (approximately 254%) more effective at FSAA than the Radeon HD 5450, and also able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 4830 1GB		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: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core 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 in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.