Radeon HD 4670 1GB vs Radeon HD 5550

Intro

Compare those specifications to the Radeon HD 5550, which features a GPU core clock speed of 550 MHz, and 512 MB of DDR2 memory running at 400 MHz through a 128-bit bus. It also is comprised of 320(64x5) SPUs, 16 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 4670 1GB should theoretically be a lot better than the Radeon HD 5550 in general. (explain)

Radeon HD 4670 1GB		35200 MB/sec
Radeon HD 5550		12800 MB/sec
	Difference: 22400 (175%)

Texel Rate

The Radeon HD 4670 1GB is much (about 173%) faster with regards to anisotropic filtering than the Radeon HD 5550. (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
Radeon HD 5550		8800 Mtexels/sec
	Difference: 15200 (173%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4670 1GB is a better choice, by far. (explain)

Radeon HD 4670 1GB		6000 Mpixels/sec
Radeon HD 5550		4400 Mpixels/sec
	Difference: 1600 (36%)

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 max amount of information (measured in megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, 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 number is worked out by multiplying the number of colour ROPs by the clock speed of the card. 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 quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.