Radeon R9 280X vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which makes use of a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific model. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon R9 280X		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 280X will be 80% quicker than the Radeon R9 M395X in general, due to its higher data rate. (explain)

Radeon R9 280X		288000 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 128000 (80%)

Texel Rate

The Radeon R9 280X is just a bit (about 18%) faster with regards to anisotropic filtering than the Radeon R9 M395X. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 16256 (18%)

Pixel Rate

The Radeon R9 280X will be a little bit (about 18%) faster with regards to full screen anti-aliasing than the Radeon R9 M395X, and also will be able to handle higher resolutions while still performing well. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 4064 (18%)

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 data (counted in megabytes per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a 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. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.