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GeForce GTX 650 vs Radeon R9 M275X

Intro

The GeForce GTX 650 features a GPU core clock speed of 1058 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1250 MHz through a 128-bit bus. It also is comprised of 384 Stream Processors, 32 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon R9 M275X, which features GPU core speed of 900 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is comprised of 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
GeForce GTX 650		64 Watts
	Difference: 14 Watts (28%)

Memory Bandwidth

In theory, the GeForce GTX 650 should be 11% quicker than the Radeon R9 M275X in general, due to its higher data rate. (explain)

GeForce GTX 650		80000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 8000 (11%)

Texel Rate

The Radeon R9 M275X is a bit (about 6%) faster with regards to AF than the GeForce GTX 650. (explain)

Radeon R9 M275X		36000 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 2144 (6%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 650 is the winner, but only just. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 2528 (18%)

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 M275X

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Specifications

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Model	GeForce GTX 650	Radeon R9 M275X
Manufacturer	nVidia	AMD
Year	September 2012	May 1 2014
Code Name	GK107	Venus XTX
Memory	1024 MB	2048 MB
Core Speed	1058 MHz	900 MHz
Memory Speed	5000 MHz	4500 MHz
Power (Max TDP)	64 watts	50 watts
Bandwidth	80000 MB/sec	72000 MB/sec
Texel Rate	33856 Mtexels/sec	36000 Mtexels/sec
Pixel Rate	16928 Mpixels/sec	14400 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 maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the video 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 maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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