Radeon HD 4890 1GB vs Radeon RX 470

Intro

Compare those specifications to the Radeon RX 470, which comes with GPU core speed of 926 MHz, and 8192 MB of GDDR5 memory set to run at 1650 MHz through a 256-bit bus. It also features 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470		120 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 70 Watts (58%)

Memory Bandwidth

Performance-wise, the Radeon RX 470 should in theory be much superior to the Radeon HD 4890 1GB overall. (explain)

Radeon RX 470		211200 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 86400 (69%)

Texel Rate

The Radeon RX 470 will be a lot (approximately 196%) faster with regards to anisotropic filtering than the Radeon HD 4890 1GB. (explain)

Radeon RX 470		118528 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 78528 (196%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon RX 470 is a better choice, by far. (explain)

Radeon RX 470		29632 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 13632 (85%)

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: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.