Radeon HD 4890 1GB vs Radeon RX 460 2GB

Intro

Compare those specifications to the Radeon RX 460 2GB, which features a core clock frequency of 1090 MHz and a GDDR5 memory frequency of 1750 MHz. It also makes use of a 128-bit bus, and uses a 14 nm design. It features 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460 2GB		75 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 115 Watts (153%)

Memory Bandwidth

The Radeon HD 4890 1GB should theoretically be a bit faster than the Radeon RX 460 2GB in general. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon RX 460 2GB		112000 MB/sec
	Difference: 12800 (11%)

Texel Rate

The Radeon RX 460 2GB will be a lot (more or less 53%) better at AF than the Radeon HD 4890 1GB. (explain)

Radeon RX 460 2GB		61040 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 21040 (53%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon RX 460 2GB is a better choice, but only just. (explain)

Radeon RX 460 2GB		17440 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 1440 (9%)

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 max amount of information (in units of MB per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines 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 also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.