Radeon HD 4870 1GB vs Radeon RX 550

Intro

Compare those specifications to the Radeon RX 550, which makes use of a 14 nm design. AMD has clocked the core frequency at 1100 MHz. The GDDR5 RAM works at a frequency of 1750 MHz on this card. It features 512 SPUs as well as 32 TAUs 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 4870 1GB		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 1GB should in theory be a bit better than the Radeon RX 550 in general. (explain)

Radeon HD 4870 1GB		115200 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 512 (0%)

Texel Rate

The Radeon RX 550 will be a bit (approximately 17%) faster with regards to anisotropic filtering than the Radeon HD 4870 1GB. (explain)

Radeon RX 550		35200 Mtexels/sec
Radeon HD 4870 1GB		30000 Mtexels/sec
	Difference: 5200 (17%)

Pixel Rate

The Radeon RX 550 is quite a bit (approximately 47%) faster with regards to full screen anti-aliasing than the Radeon HD 4870 1GB, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon RX 550		17600 Mpixels/sec
Radeon HD 4870 1GB		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 largest amount of data (in units of MB per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 can be processed in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.