Radeon HD 4650 512MB vs Radeon RX 550

Intro

Compare all that to the Radeon RX 550, which uses a 14 nm design. AMD has clocked the core speed at 1100 MHz. The GDDR5 RAM works at a speed of 1750 MHz on this specific model. It features 512 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 550		50 Watts
Radeon HD 4650 512MB		55 Watts
	Difference: 5 Watts (10%)

Memory Bandwidth

Theoretically, the Radeon RX 550 should be quite a bit faster than the Radeon HD 4650 512MB in general. (explain)

Radeon RX 550		114688 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 98688 (617%)

Texel Rate

The Radeon RX 550 will be quite a bit (more or less 83%) more effective at AF than the Radeon HD 4650 512MB. (explain)

Radeon RX 550		35200 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 16000 (83%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon RX 550 is the winner, and very much so. (explain)

Radeon RX 550		17600 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 12800 (267%)

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 transferred across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.