Radeon HD 4870 X2 vs Radeon RX 550

Intro

Compare all of that to the Radeon RX 550, which has core clock speeds of 1100 MHz on the GPU, and 1750 MHz on the 2048 MB of GDDR5 memory. It features 512 SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 550		50 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 300 Watts (600%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 X2 should theoretically be much better than the Radeon RX 550 in general. (explain)

Radeon HD 4870 X2		230400 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 115712 (101%)

Texel Rate

The Radeon HD 4870 X2 is much (more or less 70%) better at AF than the Radeon RX 550. (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
Radeon RX 550		35200 Mtexels/sec
	Difference: 24800 (70%)

Pixel Rate

The Radeon HD 4870 X2 is a lot (about 36%) better at anti-aliasing than the Radeon RX 550, and also should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
Radeon RX 550		17600 Mpixels/sec
	Difference: 6400 (36%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.