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Radeon HD 5750 1GB vs Radeon R9 M265X

Intro

The Radeon HD 5750 1GB features a core clock frequency of 700 MHz and a GDDR5 memory frequency of 1150 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It features 720(144x5) SPUs, 36 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon R9 M265X, which makes use of a 28 nm design. AMD has set the core speed at 575 MHz. The GDDR5 RAM runs at a frequency of 1125 MHz on this specific model. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 5750 1GB will be 2% quicker than the Radeon R9 M265X overall, due to its greater bandwidth. (explain)

Radeon HD 5750 1GB		73600 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 1600 (2%)

Texel Rate

The Radeon HD 5750 1GB will be a small bit (approximately 10%) better at anisotropic filtering than the Radeon R9 M265X. (explain)

Radeon HD 5750 1GB		25200 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 2200 (10%)

Pixel Rate

The Radeon HD 5750 1GB will be much (approximately 22%) more effective at AA than the Radeon R9 M265X, and will be able to handle higher resolutions more effectively. (explain)

Radeon HD 5750 1GB		11200 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 2000 (22%)

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 M265X

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Specifications

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Model	Radeon HD 5750 1GB	Radeon R9 M265X
Manufacturer	AMD	AMD
Year	October 13, 2009	May 1 2014
Code Name	Juniper LE	Venus Pro
Memory	1024 MB	2048 MB
Core Speed	700 MHz	575 MHz
Memory Speed	4600 MHz	4500 MHz
Power (Max TDP)	86 watts	(Unknown) watts
Bandwidth	73600 MB/sec	72000 MB/sec
Texel Rate	25200 Mtexels/sec	23000 Mtexels/sec
Pixel Rate	11200 Mpixels/sec	9200 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: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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