Power Consumption: 50% of the Original Xbox 360, and Quieter

Moore’s Law is good for any of three things: 1) increasing performance, 2) adding features, 3) reducing power. Consoles have the benefit of not having to worry about improving performance or adding features over time. There are no changing API specs and games are always designed to the same hardware performance level. This leaves us with improvements in power consumption (and Microsoft’s profitability).

The new Xbox 360 power connector (right). It's slim.

The new power brick isn’t compatible with the old Xbox 360s. At 135W it isn’t enough to power even the Jasper Xbox 360 and thus you get a new power connector. It’s much lighter than the old unit and a bit smaller, but still larger than anything you’d get with a notebook for obvious reasons.

New power brick (left) vs Old power brick (right)

Given my plethora of Xbox 360s I happen to have a good amount of historical data on power consumption for all of the major revisions, I’ve added the relevant Valhalla numbers below.

Power Consumption Comparison
Xbox 360 Revision System Off Idle Halo 3 Rockband 2 Gears of War 2 Red Dead Redemption
Xbox 360 Slim (Valhalla) 0.6W 70.4W 87.0W 82.7W 88.0W 90.4W
Xbox 360 Late 2008 - 2010 (Jasper) 2.0W 93.7W 105.9W 101.0W 105.9W 109.3W
Xbox 360 Late 2007 - 2008 (Falcon) 2.8W 101.4W 121.2W 112.8W 121.5W  
Xbox 360 2005 - 2007 (Xenon) 2.3W 155.7W 177.8W 167.7W 177.1W  

The biggest improvement is actually when the system is totally off. The new Xbox 360 slim pulled 0.6W compared to over 2W for the older 360s while doing nothing more than being plugged in. Idle power is roughly 75% of what it was with the Jasper Xbox 360 and load power is around 80 - 83% of what we saw with the previous generation. Note that the new Xbox 360 consumes less than half the power of the original 360!

Idle power consumption is actually not very impressive for a 40nm Xbox 360 if that's indeed what we're looking at. A modern day Core i5 system with an efficient power supply will idle at under 70W with a beefy discrete graphics card. While this is a significant drop compared to previous Xbox iterations, it's not impressive as a computing device.

The savings are tangible however and also result in a cooler, quieter system. The CPU and GPU are now cooled by a single, larger fan that keeps idle noise down to a minimum. I measured noise levels between Valhalla and Jasper at 2” away from the chassis and came up with the numbers below:

Sound Comparison
  Xbox 360 Slim (Valhalla) Xbox 360 Late 2008 - 2010 (Jasper)
Idle 45 dB(A) 50 dB(A)
Load (Spinning Disc) 51 dB(A) 54 dB(A)

The measurements were taken in my office with a noise floor of around 37 dB(A). At idle the new Xbox 360 slim is noticeably quieter, but still audible. The drop in idle noise is perfect for those of you who use the Xbox 360 as a HTPC of sorts. You can still get quieter out of a well designed HTPC however.

While spinning a disc the old Jasper was absurdly loud it is more bearable on the new 360. It’s still not silent (nor can it be while quickly spinning a disc) and you’ll still scratch discs if you move the Xbox 360 while a disc is spinning, but it’s an improvement.

Much Prettier than the Original Getting Inside the new Xbox 360


View All Comments

  • mczak - Friday, June 18, 2010 - link

    is still disappointing imho, at idle. Sure standby power is much lower, but that's just because it is required by law, so if you're surprised by this, don't be, EU regulation requires standby power below 1W nowadays (and less than 0.5W standby power in 2 years). There's no law though requiring to implement reasonable power management when devices are running, and unfortunately it shows. Apparently none of the current consoles have any power management worth speaking of, it's not required by law, it's not a selling argument, so the companies just don't bother at all. Seeing how power management actually takes an effort to get to work (usually riddled with bugs ranging from hardware clock gating issues up to software timers) this isn't terribly surprising, but maybe one day it will be a selling argument, since apparently at least in the pc world all cpus and gpus finally implement it... Reply
  • jigglywiggly - Saturday, June 19, 2010 - link

    No you cannot connect any random dvd drive, they are tied to the motherboard.
    You can spoof them though.
  • IceCold12 - Saturday, June 19, 2010 - link

    #1. Why did Anandtech deliberately hide the fact that they used a very old Power supply to exaggerate the size differences between the newer Vallhalla Slim Kinetic 360 power supply? Most likely embargo from Microsoft??

    #2. Why no direct tests vs an newer Elite Jasper running a game from the HDD vs a new slim Kinetic running a game from the HDD. Why? because there is most likely no difference at all.

    Way to ruin your rep AnAndtuch

    So what embargos or restrictions did Microsoft put on you guys at Anantech?

    Or are you guys now taking money in order to leave certain things out of your reviews??

    We need to investigate Ananatechs behaviors, looks to me like they are no longer impartial or a credible source of reliable information.

    This story goes deeper.
  • bigben - Saturday, June 19, 2010 - link

    yeah. and anand is illuminati.


    watch out.

    seriously, though, nice article.
  • XboxMySocks - Saturday, June 19, 2010 - link

    Are you fucking simple? What did you want anand to compare the new PSU to? A kitten? Comparing the new one to the old one is very comprehensive, shut your face. Reply
  • sdfdsfs - Saturday, June 19, 2010 - link

    I'm guessing cost more than anything else, this thing has to be as cheap as possible in order to turn a profit. Reply
  • sdfdsfs - Saturday, June 19, 2010 - link

    sing cost more than anything else, this thing has to be as cheap as possible in order to turn a profit. Reply
  • sdfdsfs - Saturday, June 19, 2010 - link

    on not to use a slim DVD Reply
  • sdfdsfs - Saturday, June 19, 2010 - link

    d tests were done with a spinning disc Reply
  • TEAMSWITCHER - Saturday, June 19, 2010 - link

    How can you keep a straight face talking about XBox 360 when 4 of 5 have died. I really can't understand why this isn't the biggest scandal in the tech world. This hardware has the worst track record in the history of electronics. I can see maybe buying a second one to replace the first, but a third, a fourth, a fifth! That's insanity! Reply

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