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Radeon R9 270 vs Radeon R9 M295X

Intro

The Radeon R9 270 comes with a GPU core clock speed of 900 MHz, and the 2048 MB of GDDR5 RAM runs at 1400 MHz through a 256-bit bus. It also is made up of 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon R9 M295X, which comes with core clock speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon R9 270		150 Watts
	Difference: 25 Watts (20%)

Memory Bandwidth

The Radeon R9 270 should in theory perform a bit faster than the Radeon R9 M295X overall. (explain)

Radeon R9 270		179200 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 3200 (2%)

Texel Rate

The Radeon R9 M295X will be much (approximately 33%) more effective at AF than the Radeon R9 270. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon R9 270		72000 Mtexels/sec
	Difference: 24000 (33%)

Pixel Rate

The Radeon R9 270 should be just a bit (approximately 20%) better at FSAA than the Radeon R9 M295X, and also will be able to handle higher screen resolutions while still performing well. (explain)

Radeon R9 270		28800 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 4800 (20%)

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

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Radeon R9 270

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Radeon R9 M295X

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Specifications

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Model	Radeon R9 270	Radeon R9 M295X
Manufacturer	AMD	AMD
Year	November 2013	2014
Code Name	Curacao Pro	Unknown
Memory	2048 MB	4096 MB
Core Speed	900 MHz	750 MHz
Memory Speed	5600 MHz	5500 MHz
Power (Max TDP)	150 watts	125 watts
Bandwidth	179200 MB/sec	176000 MB/sec
Texel Rate	72000 Mtexels/sec	96000 Mtexels/sec
Pixel Rate	28800 Mpixels/sec	24000 Mpixels/sec
Unified Shaders	1280	2048
Texture Mapping Units	80	128
Render Output Units	32	32
Bus Type	GDDR5	GDDR5
Bus Width	256-bit	256-bit
Fab Process	28 nm	28 nm
Transistors	2800 million	(Unknown) million
Bus	PCIe 3.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 11.2	DirectX 11.2
OpenGL Version	OpenGL 4.3	OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once 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 high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called 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 of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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