Radeon HD 4550 256MB vs Radeon HD 6750 1GB

Intro

Compare that to the Radeon HD 6750 1GB, which comes with GPU clock speed of 725 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 128-bit bus. It also is made up of 720 SPUs, 36 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 256MB		25 Watts
Radeon HD 6750 1GB		86 Watts
	Difference: 61 Watts (244%)

Memory Bandwidth

In theory, the Radeon HD 6750 1GB is 400% faster than the Radeon HD 4550 256MB in general, due to its greater bandwidth. (explain)

Radeon HD 6750 1GB		64000 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 51200 (400%)

Texel Rate

The Radeon HD 6750 1GB is a lot (more or less 444%) better at anisotropic filtering than the Radeon HD 4550 256MB. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 21300 (444%)

Pixel Rate

The Radeon HD 6750 1GB is quite a bit (more or less 383%) more effective at AA than the Radeon HD 4550 256MB, and able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 6750 1GB		11600 Mpixels/sec
Radeon HD 4550 256MB		2400 Mpixels/sec
	Difference: 9200 (383%)

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 information (measured in MB per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, 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 can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.