Radeon R9 380 2G vs Radeon R9 M290X

Intro

Compare that to the Radeon R9 M290X, which comes with core clock speeds of 850 MHz on the GPU, and 1200 MHz on the 4096 MB of GDDR5 RAM. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M290X		100 Watts
Radeon R9 380 2G		190 Watts
	Difference: 90 Watts (90%)

Memory Bandwidth

The Radeon R9 380 2G should in theory perform a little bit faster than the Radeon R9 M290X in general. (explain)

Radeon R9 380 2G		182400 MB/sec
Radeon R9 M290X		153600 MB/sec
	Difference: 28800 (19%)

Texel Rate

The Radeon R9 380 2G will be quite a bit (approximately 60%) faster with regards to anisotropic filtering than the Radeon R9 M290X. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
Radeon R9 M290X		68000 Mtexels/sec
	Difference: 40640 (60%)

Pixel Rate

The Radeon R9 380 2G is a bit (about 14%) faster with regards to anti-aliasing than the Radeon R9 M290X, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 380 2G		31040 Mpixels/sec
Radeon R9 M290X		27200 Mpixels/sec
	Difference: 3840 (14%)

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 data (measured in MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 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 high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 bandwidth is, the lower the ability to get to the max fill rate.