Radeon R9 380 4G vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has a clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit bus, and uses a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon R9 380 4G		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

Performance-wise, the Radeon R9 380 4G should theoretically be a bit better than the Radeon R9 M390X overall. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 22400 (14%)

Texel Rate

The Radeon R9 380 4G will be a bit (about 17%) faster with regards to AF than the Radeon R9 M390X. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 16096 (17%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 380 4G is superior to the Radeon R9 M390X, and very much so. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 7904 (34%)

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 data (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This 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 in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number 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 filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.