Radeon HD 4890 1GB vs Radeon R9 380X

Intro

Compare those specifications to the Radeon R9 380X, which features GPU core speed of 970 MHz, and 4096 MB of GDDR5 RAM set to run at 1425 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon R9 380X should be 46% faster than the Radeon HD 4890 1GB overall, due to its greater bandwidth. (explain)

Radeon R9 380X		182400 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 57600 (46%)

Texel Rate

The Radeon R9 380X will be much (about 210%) faster with regards to anisotropic filtering than the Radeon HD 4890 1GB. (explain)

Radeon R9 380X		124160 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 84160 (210%)

Pixel Rate

The Radeon R9 380X should be quite a bit (more or less 94%) better at full screen anti-aliasing than the Radeon HD 4890 1GB, and also will be capable of handling higher screen resolutions while still performing well. (explain)

Radeon R9 380X		31040 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 15040 (94%)

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 largest amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are 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 the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in a 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 - 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.