Radeon R9 390 8G vs Radeon R9 M380

Intro

Compare that to the Radeon R9 M380, which comes with a GPU core clock speed of 1000 MHz, and 4096 MB of GDDR5 RAM running at 1500 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 390 8G should in theory perform much faster than the Radeon R9 M380 in general. (explain)

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

Texel Rate

The Radeon R9 390 8G is much (more or less 300%) more effective at anisotropic filtering than the Radeon R9 M380. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 390 8G is superior to the Radeon R9 M380, by far. (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: Bandwidth is the maximum amount of information (measured in MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. 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 many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.