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GeForce GTX 650 vs Radeon R9 M275X

Intro

The GeForce GTX 650 features a core clock speed of 1058 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It features 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon R9 M275X, which features core clock speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs along with 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

Theoretically, the GeForce GTX 650 should perform a little bit faster than the Radeon R9 M275X overall. (explain)

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

Texel Rate

The Radeon R9 M275X will be a little bit (more or less 6%) faster with regards to anisotropic filtering than the GeForce GTX 650. (explain)

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

Pixel Rate

The GeForce GTX 650 will be a little bit (approximately 18%) more effective at FSAA than the Radeon R9 M275X, and also will be able to handle higher screen resolutions while still performing well. (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 max amount of information (measured in MB per second) that can be transferred over the external memory interface within a second. It's 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 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video 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 the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

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