Radeon HD 4550 256MB vs Radeon HD 7750

Intro

Compare all of that to the Radeon HD 7750, which makes use of a 28 nm design. AMD has set the core speed at 800 MHz. The GDDR5 memory is set to run at a frequency of 1125 MHz on this model. It features 512 SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 256MB		25 Watts
Radeon HD 7750		55 Watts
	Difference: 30 Watts (120%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7750 is 463% faster than the Radeon HD 4550 256MB in general, because of its greater data rate. (explain)

Radeon HD 7750		72000 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 59200 (463%)

Texel Rate

The Radeon HD 7750 should be a lot (approximately 433%) more effective at texture filtering than the Radeon HD 4550 256MB. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 20800 (433%)

Pixel Rate

The Radeon HD 7750 is much (approximately 433%) faster with regards to full screen anti-aliasing than the Radeon HD 4550 256MB, and also capable of handling higher resolutions while still performing well. (explain)

Radeon HD 7750		12800 Mpixels/sec
Radeon HD 4550 256MB		2400 Mpixels/sec
	Difference: 10400 (433%)

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 (counted in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated 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 filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.