A Spymac thread posted this weekend reveals some screenshots and information about a feature of the new PowerMac G5's called "Slewing".
The feature is located in the Energy Saver Control Panel and allows the user to make some modifications to the Processor and Bus performance settings. A concept that is familiar to laptop owners... the G5 can be run in Reduced, Highest and Automatic performance settings.
To lower power consumption, heat generation, and fan noise, the Power Mac G5 computer incorporates an automatic power management technique called bus slewing. Bus slewing is designed to run at high processor and bus speeds and high voltage when the demand on the processor is high, and to run at low processor and bus speeds and low voltage when the demand on the processor is low.
Speed ranges involved start from 1.3GHz up to the highest rated GHz of the chip (1.6, 1.8, or 2.0). The default slewing option for the PowerMac G5s is Automatic, and the processor and bus speeds are modulated seamlessly to the user.
According to our contacts, there should be no performance loss in Automatic mode.
That being said, at least one user (in the previously mentioned thread) claims an 11 point increase in their Xbench score after changing their Slewing mode from Automatic to Highest. However, readers are reminded that XBench has been inconsistent in producing reproducible benchmark numbers -- even on the same machine. MacRumors' reader 1stunna managed to get a 11 point increase in Xbench scores by simply rerunning the test three times, with no other changes to the system. Whether this represents test-to-test variability or a side-effect of the processor automatically ramping up is still up for debate.
The ramp time up or down is ~1ms, but the CPU is running normally during this time, so there is no performance "hiccup". This results in about 60% power/heat savings, which jumps up to about 85% savings if the machine is idle and they "turn on other power saving features". When idle, the CPU fans are barely turning.
Tuesday November 19, 2024 12:12 pm PST by Joe Rossignol
Barclays analyst Tom O'Malley and his colleagues recently traveled to Asia to meet with various electronics manufacturers and suppliers. In a research note this week, outlining key takeaways from the trip, the analysts said they have "confirmed" that a fourth-generation iPhone SE with an Apple-designed 5G modem is slated to launch towards the end of the first quarter next year. In line with previo...
Wednesday November 20, 2024 3:42 am PST by Tim Hardwick
AT&T has begun displaying "Turbo" in the iPhone carrier label for customers subscribed to its premium network prioritization service, according to reports on Reddit. The new indicator seems to have started appearing after users updated to iOS 18.1.1, but that could be just coincidence.
Image credit: Reddit user No_Highlight7476
The Turbo feature provides enhanced network performance through ...
We're officially just one week away from Black Friday, which will take place on Friday, November 29 in 2024. As always, this week is the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more.
Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we may receive a small...
Anker today kicked off its big Black Friday sale, which is set to run through December 9. This sale includes notable discounts on portable chargers, USB-C hubs, cables, and more.
Note: MacRumors is an affiliate partner with Anker. When you click a link and make a purchase, we may receive a small payment, which helps us keep the site running.
There are a few bonus offers during this event as ...
Thursday November 21, 2024 5:10 am PST by Joe Rossignol
Apple's annual four-day Black Friday through Cyber Monday shopping event is returning on Friday, November 29 through Monday, December 2 in many countries, including the U.S., Canada, Australia, France, Germany, Italy, Spain, the U.K., and others. During the event, customers can get an Apple gift card with the purchase of an eligible product.
In the U.S., for instance, Apple is including gift ...
Tuesday November 19, 2024 10:36 am PST by Juli Clover
Apple has partnered with select merchants to offer Apple Card users three percent Daily Cash back on their purchases, and two new companies were added to the partner list today. When purchasing goods and services from Booking.com and ChargePoint, Apple Card users will now get more cash back.
Booking.com is a site for reserving flights, cars, cruises, and hotels, while ChargePoint sells...
Tuesday November 19, 2024 10:10 am PST by Juli Clover
Apple today released iOS 18.1.1 and iPadOS 18.1.1, minor updates to the iOS 18 and iPadOS 18 operating systems that debuted earlier in September. iOS 18.1.1 and iPadOS 18.1.1 come three weeks after the launch of iOS 18.1.
The new software can be downloaded on eligible iPhones and iPads over-the-air by going to Settings > General > Software Update. Apple has also released iOS 17.7.2 for...
Amazon today has knocked the price off of multiple M3 MacBook Air models, with as much as $300 off select computers. Prices start at $849.00 for the 13-inch M3 MacBook Air (16GB RAM/256GB), and also include multiple 15-inch models as well.
Note: MacRumors is an affiliate partner with Amazon. When you click a link and make a purchase, we may receive a small payment, which helps us keep the site ...