Radeon HD 4650 1GB vs Radeon RX 550

Intro

Compare those specs to the Radeon RX 550, which comes with a core clock speed of 1100 MHz and a GDDR5 memory speed of 1750 MHz. It also makes use of a 128-bit bus, and uses a 14 nm design. It is made up of 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

The Radeon RX 550, in theory, should be a lot faster than the Radeon HD 4650 1GB overall. (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 a lot (more or less 83%) better at texture filtering 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 should be much (about 267%) faster with regards to AA than the Radeon HD 4650 1GB, and will be capable of handling higher screen resolutions more effectively. (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 max amount of data (measured in MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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