Radeon HD 4550 256MB vs Radeon HD 6570 (OEM) 2GB

Intro

Compare those specifications to the Radeon HD 6570 (OEM) 2GB, which has GPU clock speed of 650 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also features 480 Stream Processors, 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 256MB		25 Watts
Radeon HD 6570 (OEM) 2GB		50 Watts
	Difference: 25 Watts (100%)

Memory Bandwidth

Theoretically, the Radeon HD 6570 (OEM) 2GB should perform much faster than the Radeon HD 4550 256MB in general. (explain)

Radeon HD 6570 (OEM) 2GB		64000 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 51200 (400%)

Texel Rate

The Radeon HD 6570 (OEM) 2GB should be a lot (more or less 225%) faster with regards to AF than the Radeon HD 4550 256MB. (explain)

Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 10800 (225%)

Pixel Rate

The Radeon HD 6570 (OEM) 2GB should be a lot (more or less 117%) more effective at AA than the Radeon HD 4550 256MB, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 6570 (OEM) 2GB		5200 Mpixels/sec
Radeon HD 4550 256MB		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 maximum amount of information (in units of MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.