Radeon HD 4890 2GB vs Radeon RX 550

Intro

Compare that to the Radeon RX 550, which has GPU clock speed of 1100 MHz, and 2048 MB of GDDR5 RAM running at 1750 MHz through a 128-bit bus. It also features 512 SPUs, 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 4890 2GB		190 Watts
	Difference: 140 Watts (280%)

Memory Bandwidth

The Radeon HD 4890 2GB, in theory, should be a small bit faster than the Radeon RX 550 overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 10112 (9%)

Texel Rate

The Radeon HD 4890 2GB is a little bit (about 14%) better at anisotropic filtering than the Radeon RX 550. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
Radeon RX 550		35200 Mtexels/sec
	Difference: 4800 (14%)

Pixel Rate

The Radeon RX 550 is just a bit (about 10%) faster with regards to full screen anti-aliasing than the Radeon HD 4890 2GB, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon RX 550		17600 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 1600 (10%)

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 over the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once 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 can be applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.