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Radeon HD 6570 (OEM) 2GB vs Radeon R7 250

Intro

The Radeon HD 6570 (OEM) 2GB makes use of a 40 nm design. AMD has clocked the core frequency at 650 MHz. The GDDR5 RAM runs at a speed of 1000 MHz on this particular card. It features 480 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

Compare those specs to the Radeon R7 250, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1150 MHz on this model. It features 384 SPUs along with 24 TAUs and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6570 (OEM) 2GB		50 Watts
Radeon R7 250		65 Watts
	Difference: 15 Watts (30%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250 should be a small bit faster than the Radeon HD 6570 (OEM) 2GB overall. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 6570 (OEM) 2GB		64000 MB/sec
	Difference: 9600 (15%)

Texel Rate

The Radeon R7 250 is much (approximately 54%) faster with regards to AF than the Radeon HD 6570 (OEM) 2GB. (explain)

Radeon R7 250		24000 Mtexels/sec
Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
	Difference: 8400 (54%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R7 250 is a better choice, and very much so. (explain)

Radeon R7 250		8000 Mpixels/sec
Radeon HD 6570 (OEM) 2GB		5200 Mpixels/sec
	Difference: 2800 (54%)

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 6570 (OEM) 2GB

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Radeon R7 250

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Specifications

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Model	Radeon HD 6570 (OEM) 2GB	Radeon R7 250
Manufacturer	AMD	AMD
Year	February 2011	October 2013
Code Name	Turks	Oland XT
Memory	1024 MB	1024 MB
Core Speed	650 MHz	1000 MHz
Memory Speed	4000 MHz	4600 MHz
Power (Max TDP)	50 watts	65 watts
Bandwidth	64000 MB/sec	73600 MB/sec
Texel Rate	15600 Mtexels/sec	24000 Mtexels/sec
Pixel Rate	5200 Mpixels/sec	8000 Mpixels/sec
Unified Shaders	480	384
Texture Mapping Units	24	24
Render Output Units	8	8
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	40 nm	28 nm
Transistors	715 million	1040 million
Bus	PCIe 2.1 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 (counted in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at 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 the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock 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 quite a few other factors, especially 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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