Radeon HD 4550 512MB vs Radeon HD 7750

Intro

Compare those specs to the Radeon HD 7750, which comes with clock speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 512 SPUs as well as 32 TAUs and 16 ROPs.

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

Theoretically speaking, the Radeon HD 7750 should be 463% quicker than the Radeon HD 4550 512MB in general, due to its higher data rate. (explain)

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

Texel Rate

The Radeon HD 7750 will be a lot (approximately 433%) faster with regards to texture filtering 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

If using high levels of AA is important to you, then the Radeon HD 7750 is superior to the Radeon HD 4550 512MB, and very much so. (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: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.