Radeon R9 380 4G vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which uses a 28 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 memory is set to run at a frequency of 1375 MHz on this card. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon R9 380 4G		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 4G will be 4% quicker than the Radeon R9 M295X overall, due to its greater data rate. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 6400 (4%)

Texel Rate

The Radeon R9 380 4G should be just a bit (more or less 13%) better at texture filtering than the Radeon R9 M295X. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 12640 (13%)

Pixel Rate

The Radeon R9 380 4G is much (more or less 29%) faster with regards to anti-aliasing than the Radeon R9 M295X, and should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 7040 (29%)

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: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount 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 output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.