Radeon HD 6670 (OEM) 1GB vs Radeon HD 7850

Intro

Compare all that to the Radeon HD 7850, which makes use of a 28 nm design. AMD has set the core frequency at 860 MHz. The GDDR5 memory works at a frequency of 1200 MHz on this specific model. It features 1024 SPUs along with 64 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB		63 Watts
Radeon HD 7850		130 Watts
	Difference: 67 Watts (106%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7850 is 140% faster than the Radeon HD 6670 (OEM) 1GB overall, because of its higher bandwidth. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 6670 (OEM) 1GB		64000 MB/sec
	Difference: 89600 (140%)

Texel Rate

The Radeon HD 7850 is a lot (about 187%) more effective at texture filtering than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
	Difference: 35840 (187%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7850 is superior to the Radeon HD 6670 (OEM) 1GB, by a large margin. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		6400 Mpixels/sec
	Difference: 21120 (330%)

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: Bandwidth is the max amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number 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 Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.