Radeon HD 4650 1GB vs Radeon RX 550

Intro

Compare that to the Radeon RX 550, which features a GPU core clock speed of 1100 MHz, and 2048 MB of GDDR5 memory running at 1750 MHz through a 128-bit bus. It also features 512 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 550		50 Watts
Radeon HD 4650 1GB		55 Watts
	Difference: 5 Watts (10%)

Memory Bandwidth

In theory, the Radeon RX 550 should be quite a bit faster than the Radeon HD 4650 1GB in general. (explain)

Radeon RX 550		114688 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 92288 (412%)

Texel Rate

The Radeon RX 550 should be quite a bit (more or less 83%) better at AF than the Radeon HD 4650 1GB. (explain)

Radeon RX 550		35200 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 16000 (83%)

Pixel Rate

The Radeon RX 550 will be much (about 267%) more effective at full screen anti-aliasing than the Radeon HD 4650 1GB, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon RX 550		17600 Mpixels/sec
Radeon HD 4650 1GB		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 data (measured in MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's 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 processed per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.