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GeForce GTX 650 vs Radeon R9 M270X

Intro

The GeForce GTX 650 makes use of a 28 nm design. nVidia has clocked the core speed at 1058 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this specific model. It features 384 SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon R9 M270X, which comes with a GPU core clock speed of 725 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce GTX 650 should in theory be a small bit better than the Radeon R9 M270X overall. (explain)

GeForce GTX 650		80000 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 8000 (11%)

Texel Rate

The GeForce GTX 650 will be just a bit (about 17%) faster with regards to AF than the Radeon R9 M270X. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 4856 (17%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 650 is a better choice, and very much so. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 5328 (46%)

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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GeForce GTX 650

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Radeon R9 M270X

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model	GeForce GTX 650	Radeon R9 M270X
Manufacturer	nVidia	AMD
Year	September 2012	May 1 2014
Code Name	GK107	Venus XT
Memory	1024 MB	2048 MB
Core Speed	1058 MHz	725 MHz
Memory Speed	5000 MHz	4500 MHz
Power (Max TDP)	64 watts	(Unknown) watts
Bandwidth	80000 MB/sec	72000 MB/sec
Texel Rate	33856 Mtexels/sec	29000 Mtexels/sec
Pixel Rate	16928 Mpixels/sec	11600 Mpixels/sec
Unified Shaders	384	640
Texture Mapping Units	32	40
Render Output Units	16	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	28 nm	28 nm
Transistors	1300 million	(Unknown) million
Bus	PCIe 3.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 11.0	DirectX 11.2
OpenGL Version	OpenGL 4.3	OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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