Radeon HD 4550 512MB vs Radeon HD 6570 (OEM) 2GB

Intro

Compare all of that to the Radeon HD 6570 (OEM) 2GB, which has a GPU core clock speed of 650 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 128-bit bus. It also features 480 SPUs, 24 TAUs, and 8 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 6570 (OEM) 2GB		50 Watts
	Difference: 25 Watts (100%)

Memory Bandwidth

Performance-wise, the Radeon HD 6570 (OEM) 2GB should theoretically be quite a bit better than the Radeon HD 4550 512MB in general. (explain)

Radeon HD 6570 (OEM) 2GB		64000 MB/sec
Radeon HD 4550 512MB		12800 MB/sec
	Difference: 51200 (400%)

Texel Rate

The Radeon HD 6570 (OEM) 2GB will be quite a bit (more or less 225%) better at anisotropic filtering than the Radeon HD 4550 512MB. (explain)

Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
Radeon HD 4550 512MB		4800 Mtexels/sec
	Difference: 10800 (225%)

Pixel Rate

The Radeon HD 6570 (OEM) 2GB should be a lot (approximately 117%) better at AA than the Radeon HD 4550 512MB, and will be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6570 (OEM) 2GB		5200 Mpixels/sec
Radeon HD 4550 512MB		2400 Mpixels/sec
	Difference: 2800 (117%)

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 information (in units of MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount of 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 processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.