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Radeon HD 5750 1GB vs Radeon R9 M275X

Intro

The Radeon HD 5750 1GB comes with a GPU core speed of 700 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1150 MHz through a 128-bit bus. It also is made up of 720(144x5) Stream Processors, 36 TAUs, and 16 ROPs.

Compare that to the Radeon R9 M275X, which comes with a clock speed of 900 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon HD 5750 1GB		86 Watts
	Difference: 36 Watts (72%)

Memory Bandwidth

The Radeon HD 5750 1GB, in theory, should be just a bit faster than the Radeon R9 M275X overall. (explain)

Radeon HD 5750 1GB		73600 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 1600 (2%)

Texel Rate

The Radeon R9 M275X is much (more or less 43%) better at anisotropic filtering than the Radeon HD 5750 1GB. (explain)

Radeon R9 M275X		36000 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 10800 (43%)

Pixel Rate

The Radeon R9 M275X should be much (about 29%) more effective at anti-aliasing than the Radeon HD 5750 1GB, and also will be able to handle higher screen resolutions better. (explain)

Radeon R9 M275X		14400 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 3200 (29%)

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 HD 5750 1GB

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Radeon R9 M275X

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Specifications

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Model	Radeon HD 5750 1GB	Radeon R9 M275X
Manufacturer	AMD	AMD
Year	October 13, 2009	May 1 2014
Code Name	Juniper LE	Venus XTX
Memory	1024 MB	2048 MB
Core Speed	700 MHz	900 MHz
Memory Speed	4600 MHz	4500 MHz
Power (Max TDP)	86 watts	50 watts
Bandwidth	73600 MB/sec	72000 MB/sec
Texel Rate	25200 Mtexels/sec	36000 Mtexels/sec
Pixel Rate	11200 Mpixels/sec	14400 Mpixels/sec
Unified Shaders	720(144x5)	640
Texture Mapping Units	36	40
Render Output Units	16	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	40 nm	28 nm
Transistors	1040 million	(Unknown) million
Bus	PCIe 2.1 x16	PCIe 3.0 x16
DirectX Version	DirectX 11	DirectX 11.2
OpenGL Version	OpenGL 3.2	OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the 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 clock 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 rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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