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GeForce GTX 460 vs Radeon R9 M275X

Intro

The GeForce GTX 460 features a clock frequency of 675 MHz and a GDDR5 memory frequency of 900 MHz. It also features a 192-bit memory bus, and uses a 40 nm design. It is comprised of 336 SPUs, 56 Texture Address Units, and 24 Raster Operation Units.

Compare those specifications to the Radeon R9 M275X, which has GPU clock 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 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
GeForce GTX 460		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

Theoretically, the GeForce GTX 460 should be a small bit faster than the Radeon R9 M275X in general. (explain)

GeForce GTX 460		86400 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 14400 (20%)

Texel Rate

The GeForce GTX 460 is a small bit (about 5%) better at anisotropic filtering than the Radeon R9 M275X. (explain)

GeForce GTX 460		37800 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 1800 (5%)

Pixel Rate

The GeForce GTX 460 will be just a bit (about 13%) more effective at AA than the Radeon R9 M275X, and also should be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 460		16200 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 1800 (13%)

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 460

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Radeon R9 M275X

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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 460	Radeon R9 M275X
Manufacturer	nVidia	AMD
Year	July 2010	May 1 2014
Code Name	GF104	Venus XTX
Memory	768 MB	2048 MB
Core Speed	675 MHz	900 MHz
Memory Speed	3600 MHz	4500 MHz
Power (Max TDP)	150 watts	50 watts
Bandwidth	86400 MB/sec	72000 MB/sec
Texel Rate	37800 Mtexels/sec	36000 Mtexels/sec
Pixel Rate	16200 Mpixels/sec	14400 Mpixels/sec
Unified Shaders	336	640
Texture Mapping Units	56	40
Render Output Units	24	16
Bus Type	GDDR5	GDDR5
Bus Width	192-bit	128-bit
Fab Process	40 nm	28 nm
Transistors	1950 million	(Unknown) million
Bus	PCIe x16	PCIe 3.0 x16
DirectX Version	DirectX 11	DirectX 11.2
OpenGL Version	OpenGL 4.1	OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

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