Radeon HD 4550 512MB vs Radeon HD 7750

Intro

Compare all of that to the Radeon HD 7750, which comes with a clock speed of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 512 SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB		25 Watts
Radeon HD 7750		55 Watts
	Difference: 30 Watts (120%)

Memory Bandwidth

The Radeon HD 7750 should in theory be a lot faster than the Radeon HD 4550 512MB overall. (explain)

Radeon HD 7750		72000 MB/sec
Radeon HD 4550 512MB		12800 MB/sec
	Difference: 59200 (463%)

Texel Rate

The Radeon HD 7750 should be much (approximately 433%) more effective at AF than the Radeon HD 4550 512MB. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 4550 512MB		4800 Mtexels/sec
	Difference: 20800 (433%)

Pixel Rate

The Radeon HD 7750 is a lot (about 433%) better at AA than the Radeon HD 4550 512MB, and will be able to handle higher resolutions more effectively. (explain)

Radeon HD 7750		12800 Mpixels/sec
Radeon HD 4550 512MB		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: Memory bandwidth is the largest amount of data (measured in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's 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 amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.