Running Cool 'n' Quiet under Linux with AMD

Subject: Processors | November 23, 2011 - 10:47 AM |
Tagged: amd, bulldozer, cool 'n' quiet, Turbo Core, linux, fx-8150

AMD's Cool'n'Quiet feature, which lowers your CPU core frequencies when they are not under heavy usage has been around for a while, but Phoronix though it was time to revisit the Linux support for this feature and Turbo Core as we have a brand new architecture to test.  They fired up the FX-8150 again, running under Ubuntu 11.10 with the Linux 3.1 kernel and started benchmarking.  Their results show that AMD's power saving features are still working well under Linux, better when using single threaded applications than with multi-threaded but still worth enabling for those who want lower heat production and energy consumption.  It is hard to say how much you will save on power though, as the software Phoronix used to measure, fam15h_power, never budged from the 125W mark even when the system was pulling less power from the wall.

phoronix_cnq.jpg

"For those wondering about the impact that AMD's Cool 'n' Quiet and Turbo Core technologies have under Linux for the latest-generation Bulldozer processors, here are some tests illustrating the changes in performance, power consumption, and operating temperature."

Here are some more Processor articles from around the web:

Processors

 

Source: Phoronix

A look at the 65W AMD A8-3800

Subject: General Tech | October 6, 2011 - 09:57 AM |
Tagged: amd, A8-3800, llano, APU, Turbo Core

When the A8-3850 hit the streets we were so accustomed to high powered CPUs that we barely blinked at the 100W power envelope it and the A6-3650 required.  That is a big change from just a few years ago when hitting or passing 100W tended to bring a lot of negative comments from reviewers.  AMD since released the lower powered A8-3800 and A6-3600, both of which have slightly lower CPU frequencies but the exact same graphics specifications.  The Tech Report took the A8-3800 out for a spin to examine not only the power draw but to see how well the Turbo Core feature works.  See how it turned out for AMD's newest Llano chips in the full review.

TR_chip-socket.jpg

"We weren't terribly impressed with AMD's A8-3850 APU when we first reviewed it, in part because its 100W power envelope seemed rather large for a chip whose integrated graphics are a major selling point. Happily, the new A8-3800 slides into a cool 65W power envelope and adds Turbo Core clock frequency scaling. Can it win our approval? Keep reading to find out."

Here are some more Processor articles from around the web:

Processors