Radeon HD 4890 2GB vs Radeon HD 5450

Intro

Compare all that to the Radeon HD 5450, which features core clock speeds of 650 MHz on the GPU, and 800 MHz on the 512 MB of DDR3 RAM. It features 80(16x5) SPUs as well as 8 TAUs and 4 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 171 Watts (900%)

Memory Bandwidth

Theoretically, the Radeon HD 4890 2GB should be much faster than the Radeon HD 5450 in general. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 112000 (875%)

Texel Rate

The Radeon HD 4890 2GB should be quite a bit (more or less 669%) better at anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 34800 (669%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4890 2GB is a better choice, by far. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 13400 (515%)

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 data (in units of megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes 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 get to the maximum fill rate.