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Radeon HD 5750 512MB vs Radeon HD 6670 (OEM) 1GB

Intro

The Radeon HD 5750 512MB comes with a core clock frequency of 700 MHz and a GDDR5 memory frequency of 1150 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 720(144x5) SPUs, 36 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 6670 (OEM) 1GB, which has a core clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It is comprised of 480 SPUs, 24 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB		63 Watts
Radeon HD 5750 512MB		86 Watts
	Difference: 23 Watts (37%)

Memory Bandwidth

The Radeon HD 5750 512MB should theoretically perform a little bit faster than the Radeon HD 6670 (OEM) 1GB in general. (explain)

Radeon HD 5750 512MB		73600 MB/sec
Radeon HD 6670 (OEM) 1GB		64000 MB/sec
	Difference: 9600 (15%)

Texel Rate

The Radeon HD 5750 512MB will be quite a bit (about 31%) better at AF than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 5750 512MB		25200 Mtexels/sec
Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
	Difference: 6000 (31%)

Pixel Rate

The Radeon HD 5750 512MB will be quite a bit (approximately 75%) more effective at full screen anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and also capable of handling higher screen resolutions better. (explain)

Radeon HD 5750 512MB		11200 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		6400 Mpixels/sec
	Difference: 4800 (75%)

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 512MB

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Radeon HD 6670 (OEM) 1GB

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Specifications

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Model	Radeon HD 5750 512MB	Radeon HD 6670 (OEM) 1GB
Manufacturer	AMD	AMD
Year	October 13, 2009	February 2011
Code Name	Juniper LE	Turks
Memory	512 MB	1024 MB
Core Speed	700 MHz	800 MHz
Memory Speed	4600 MHz	4000 MHz
Power (Max TDP)	86 watts	63 watts
Bandwidth	73600 MB/sec	64000 MB/sec
Texel Rate	25200 Mtexels/sec	19200 Mtexels/sec
Pixel Rate	11200 Mpixels/sec	6400 Mpixels/sec
Unified Shaders	720(144x5)	480
Texture Mapping Units	36	24
Render Output Units	16	8
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	40 nm	40 nm
Transistors	1040 million	715 million
Bus	PCIe 2.1 x16	PCIe 2.1 x16
DirectX Version	DirectX 11	DirectX 11
OpenGL Version	OpenGL 3.2	OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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 memory bandwidth is, the lower the potential to reach the maximum fill rate.

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