Radeon HD 4890 1GB vs Radeon RX 580

Intro

Compare those specs to the Radeon RX 580, which features a GPU core clock speed of 1257 MHz, and 8192 MB of GDDR5 RAM running at 2000 MHz through a 256-bit bus. It also is made up of 2304 Stream Processors, 144 Texture Address Units, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 580		185 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 5 Watts (3%)

Memory Bandwidth

Theoretically, the Radeon RX 580 should perform a lot faster than the Radeon HD 4890 1GB in general. (explain)

Radeon RX 580		262144 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 137344 (110%)

Texel Rate

The Radeon RX 580 will be a lot (about 353%) faster with regards to anisotropic filtering than the Radeon HD 4890 1GB. (explain)

Radeon RX 580		181008 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 141008 (353%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon RX 580 is the winner, by a large margin. (explain)

Radeon RX 580		40224 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 24224 (151%)

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 (counted in megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.