Radeon HD 4550 512MB vs Radeon HD 6750

Intro

Compare those specifications to the Radeon HD 6750, which has core clock speeds of 725 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 RAM. It features 720 SPUs along with 36 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB		25 Watts
Radeon HD 6750		86 Watts
	Difference: 61 Watts (244%)

Memory Bandwidth

The Radeon HD 6750 should theoretically perform a lot faster than the Radeon HD 4550 512MB in general. (explain)

Radeon HD 6750		64000 MB/sec
Radeon HD 4550 512MB		12800 MB/sec
	Difference: 51200 (400%)

Texel Rate

The Radeon HD 6750 is a lot (more or less 444%) faster with regards to anisotropic filtering than the Radeon HD 4550 512MB. (explain)

Radeon HD 6750		26100 Mtexels/sec
Radeon HD 4550 512MB		4800 Mtexels/sec
	Difference: 21300 (444%)

Pixel Rate

The Radeon HD 6750 should be a lot (about 383%) more effective at FSAA than the Radeon HD 4550 512MB, and will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 6750		11600 Mpixels/sec
Radeon HD 4550 512MB		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 maximum amount of information (counted in MB per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.