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GeForce GTX 650 vs Radeon HD 6670 (OEM) 1GB

Intro

The GeForce GTX 650 has core clock speeds of 1058 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 memory. It features 384 SPUs as well as 32 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 6670 (OEM) 1GB, which has GPU core speed of 800 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 128-bit bus. It also is made up 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
GeForce GTX 650		64 Watts
	Difference: 1 Watts (2%)

Memory Bandwidth

Theoretically, the GeForce GTX 650 should perform much faster than the Radeon HD 6670 (OEM) 1GB overall. (explain)

GeForce GTX 650		80000 MB/sec
Radeon HD 6670 (OEM) 1GB		64000 MB/sec
	Difference: 16000 (25%)

Texel Rate

The GeForce GTX 650 will be a lot (about 76%) faster with regards to AF than the Radeon HD 6670 (OEM) 1GB. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
	Difference: 14656 (76%)

Pixel Rate

The GeForce GTX 650 should be much (more or less 165%) more effective at anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		6400 Mpixels/sec
	Difference: 10528 (165%)

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 HD 6670 (OEM) 1GB

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Specifications

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Model	GeForce GTX 650	Radeon HD 6670 (OEM) 1GB
Manufacturer	nVidia	AMD
Year	September 2012	February 2011
Code Name	GK107	Turks
Memory	1024 MB	1024 MB
Core Speed	1058 MHz	800 MHz
Memory Speed	5000 MHz	4000 MHz
Power (Max TDP)	64 watts	63 watts
Bandwidth	80000 MB/sec	64000 MB/sec
Texel Rate	33856 Mtexels/sec	19200 Mtexels/sec
Pixel Rate	16928 Mpixels/sec	6400 Mpixels/sec
Unified Shaders	384	480
Texture Mapping Units	32	24
Render Output Units	16	8
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	28 nm	40 nm
Transistors	1300 million	715 million
Bus	PCIe 3.0 x16	PCIe 2.1 x16
DirectX Version	DirectX 11.0	DirectX 11
OpenGL Version	OpenGL 4.3	OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the 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 most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel 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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