Radeon R9 390X 8G vs Radeon R9 M380

Intro

Compare all that to the Radeon R9 M380, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory runs at a speed of 1500 MHz on this specific model. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 390X 8G should perform a lot faster than the Radeon R9 M380 overall. (explain)

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

Texel Rate

The Radeon R9 390X 8G is a lot (about 362%) faster with regards to AF than the Radeon R9 M380. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon R9 M380		40000 Mtexels/sec
	Difference: 144800 (362%)

Pixel Rate

The Radeon R9 390X 8G will be much (more or less 320%) faster with regards to FSAA than the Radeon R9 M380, and also will be able to handle higher screen resolutions better. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon R9 M380		16000 Mpixels/sec
	Difference: 51200 (320%)

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 largest amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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 max fill rate.