Radeon HD 4850 1GB vs Radeon HD 5450

Intro

Compare all of that to the Radeon HD 5450, which comes with a clock speed of 650 MHz and a DDR3 memory speed of 800 MHz. It also makes use of a 64-bit memory bus, and uses a 40 nm design. It is comprised of 80(16x5) SPUs, 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 4850 1GB		110 Watts
	Difference: 91 Watts (479%)

Memory Bandwidth

Performance-wise, the Radeon HD 4850 1GB should theoretically be quite a bit superior to the Radeon HD 5450 overall. (explain)

Radeon HD 4850 1GB		63552 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 50752 (397%)

Texel Rate

The Radeon HD 4850 1GB is quite a bit (approximately 381%) better at anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 4850 1GB		25000 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 19800 (381%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4850 1GB is a better choice, by far. (explain)

Radeon HD 4850 1GB		10000 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 7400 (285%)

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 largest amount of data (counted in MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video 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 maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core 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 many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.