Radeon HD 6670 (OEM) 1GB vs Radeon R7 250

Intro

Compare all that to the Radeon R7 250, which has a clock speed of 1000 MHz and a GDDR5 memory speed of 1150 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It features 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB		63 Watts
Radeon R7 250		65 Watts
	Difference: 2 Watts (3%)

Memory Bandwidth

As far as performance goes, the Radeon R7 250 should in theory be a little bit better than the Radeon HD 6670 (OEM) 1GB in general. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 6670 (OEM) 1GB		64000 MB/sec
	Difference: 9600 (15%)

Texel Rate

The Radeon R7 250 is quite a bit (approximately 25%) better at anisotropic filtering than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon R7 250		24000 Mtexels/sec
Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
	Difference: 4800 (25%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R7 250 is a better choice, by far. (explain)

Radeon R7 250		8000 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		6400 Mpixels/sec
	Difference: 1600 (25%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.