Radeon HD 4550 512MB vs Radeon HD 6670 (OEM)

Intro

Compare those specs to the Radeon HD 6670 (OEM), which comes with GPU clock speed of 800 MHz, and 512 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also features 480 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB		25 Watts
Radeon HD 6670 (OEM)		63 Watts
	Difference: 38 Watts (152%)

Memory Bandwidth

The Radeon HD 6670 (OEM), in theory, should perform quite a bit faster than the Radeon HD 4550 512MB overall. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
Radeon HD 4550 512MB		12800 MB/sec
	Difference: 51200 (400%)

Texel Rate

The Radeon HD 6670 (OEM) is a lot (more or less 300%) faster with regards to texture filtering than the Radeon HD 4550 512MB. (explain)

Radeon HD 6670 (OEM)		19200 Mtexels/sec
Radeon HD 4550 512MB		4800 Mtexels/sec
	Difference: 14400 (300%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6670 (OEM) is superior to the Radeon HD 4550 512MB, by far. (explain)

Radeon HD 6670 (OEM)		6400 Mpixels/sec
Radeon HD 4550 512MB		2400 Mpixels/sec
	Difference: 4000 (167%)

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 information (counted in MB per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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 bandwidth is, the lower the ability to reach the max fill rate.