Radeon R9 M295X vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has set the core frequency at 723 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically, the Radeon R9 M295X should perform a bit faster than the Radeon R9 M390X overall. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 16000 (10%)

Texel Rate

The Radeon R9 M295X is a bit (about 4%) better at AF than the Radeon R9 M390X. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 3456 (4%)

Pixel Rate

The Radeon R9 M295X should be a little bit (about 4%) more effective at anti-aliasing than the Radeon R9 M390X, and should be capable of handling higher resolutions more effectively. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 864 (4%)

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 information (in units of megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 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 anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends 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.