Radeon R9 390 8G vs Radeon R9 M380

Intro

Compare those specs to the Radeon R9 M380, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory works at a speed of 1500 MHz on this card. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 390 8G should theoretically be a lot 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 should be quite a bit (approximately 300%) faster with regards to 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 should be much (more or less 300%) better at anti-aliasing than the Radeon R9 M380, and should be able to handle higher resolutions while still performing well. (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 maximum amount of information (in units of MB per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.