Radeon HD 4790 vs Radeon R9 380 2G

Intro

Compare all of that to the Radeon R9 380 2G, which features GPU core speed of 970 MHz, and 2048 MB of GDDR5 RAM set to run at 1425 MHz through a 256-bit bus. It also is made up of 1792 Stream Processors, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon R9 380 2G should in theory be a lot superior to the Radeon HD 4790 overall. (explain)

Radeon R9 380 2G		182400 MB/sec
Radeon HD 4790		102400 MB/sec
	Difference: 80000 (78%)

Texel Rate

The Radeon R9 380 2G is quite a bit (more or less 466%) better at texture filtering than the Radeon HD 4790. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 89440 (466%)

Pixel Rate

The Radeon R9 380 2G is quite a bit (approximately 223%) better at FSAA than the Radeon HD 4790, and also capable of handling higher screen resolutions better. (explain)

Radeon R9 380 2G		31040 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 21440 (223%)

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 maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 number is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant 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.