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Radeon R9 M295X vs Radeon RX 470

Intro

The Radeon R9 M295X has a clock frequency of 750 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

Compare those specs to the Radeon RX 470, which has GPU clock speed of 926 MHz, and 8192 MB of GDDR5 RAM running at 1650 MHz through a 256-bit bus. It also features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470		120 Watts
Radeon R9 M295X		125 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

The Radeon RX 470 should theoretically perform a bit faster than the Radeon R9 M295X in general. (explain)

Radeon RX 470		211200 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 35200 (20%)

Texel Rate

The Radeon RX 470 will be a lot (approximately 23%) better at anisotropic filtering than the Radeon R9 M295X. (explain)

Radeon RX 470		118528 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 22528 (23%)

Pixel Rate

The Radeon RX 470 will be much (about 23%) better at anti-aliasing than the Radeon R9 M295X, and should be able to handle higher screen resolutions better. (explain)

Radeon RX 470		29632 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 5632 (23%)

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 M295X

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Radeon RX 470

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Specifications

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Model	Radeon R9 M295X	Radeon RX 470
Manufacturer	AMD	AMD
Year	2014	August 2016
Code Name	Unknown	Polaris 10
Memory	4096 MB	8192 MB
Core Speed	750 MHz	926 MHz
Memory Speed	5500 MHz	6600 MHz
Power (Max TDP)	125 watts	120 watts
Bandwidth	176000 MB/sec	211200 MB/sec
Texel Rate	96000 Mtexels/sec	118528 Mtexels/sec
Pixel Rate	24000 Mpixels/sec	29632 Mpixels/sec
Unified Shaders	2048	2048
Texture Mapping Units	128	128
Render Output Units	32	32
Bus Type	GDDR5	GDDR5
Bus Width	256-bit	256-bit
Fab Process	28 nm	14 nm
Transistors	(Unknown) million	5700 million
Bus	PCIe 3.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 11.2	DirectX 12.0
OpenGL Version	OpenGL 4.3	OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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