Radeon R9 390 8G vs Radeon R9 M380

Intro

Compare those specifications to the Radeon R9 M380, which has GPU clock speed of 1000 MHz, and 4096 MB of GDDR5 memory set to run at 1500 MHz through a 128-bit bus. It also is comprised of 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 390 8G, in theory, should be quite a bit faster than the Radeon R9 M380 overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 M380		96000 MB/sec
	Difference: 288000 (300%)

Texel Rate

The Radeon R9 390 8G should be quite a bit (more or less 300%) more effective at AF than the Radeon R9 M380. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 M380		40000 Mtexels/sec
	Difference: 120000 (300%)

Pixel Rate

The Radeon R9 390 8G will be much (about 300%) faster with regards to full screen anti-aliasing than the Radeon R9 M380, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 M380		16000 Mpixels/sec
	Difference: 48000 (300%)

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 (measured in MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 can be applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.