Radeon HD 4770 vs Radeon RX 550

Intro

Compare that to the Radeon RX 550, which has a core clock frequency of 1100 MHz and a GDDR5 memory frequency of 1750 MHz. It also makes use of a 128-bit memory bus, and uses a 14 nm design. It features 512 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 550		50 Watts
Radeon HD 4770		80 Watts
	Difference: 30 Watts (60%)

Memory Bandwidth

Theoretically, the Radeon RX 550 should be a lot faster than the Radeon HD 4770 in general. (explain)

Radeon RX 550		114688 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 63488 (124%)

Texel Rate

The Radeon RX 550 is much (more or less 47%) more effective at AF than the Radeon HD 4770. (explain)

Radeon RX 550		35200 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 11200 (47%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 550 is superior to the Radeon HD 4770, and very much so. (explain)

Radeon RX 550		17600 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 5600 (47%)

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: Bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount 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 in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.