Radeon HD 4870 512MB vs Radeon RX 550

Intro

Compare those specs to the Radeon RX 550, which has GPU core speed of 1100 MHz, and 2048 MB of GDDR5 RAM set to run at 1750 MHz through a 128-bit bus. It also is comprised of 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 4870 512MB		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

The Radeon HD 4870 512MB should in theory perform a little bit faster than the Radeon RX 550 in general. (explain)

Radeon HD 4870 512MB		115200 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 512 (0%)

Texel Rate

The Radeon RX 550 is a little bit (about 17%) faster with regards to AF than the Radeon HD 4870 512MB. (explain)

Radeon RX 550		35200 Mtexels/sec
Radeon HD 4870 512MB		30000 Mtexels/sec
	Difference: 5200 (17%)

Pixel Rate

The Radeon RX 550 should be much (approximately 47%) faster with regards to anti-aliasing than the Radeon HD 4870 512MB, and capable of handling higher resolutions more effectively. (explain)

Radeon RX 550		17600 Mpixels/sec
Radeon HD 4870 512MB		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 maximum amount of data (counted in MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 max fill rate.