MacBook Pro crashes: Apple disables Turbo Boost under Windows?
Apple may have been aware for some time of the problem of new MacBook Pros crashing under heavy loads. According to the UK's PC Pro magazine, Apple appears to have deliberately turned off Turbo Boost for the top-end 13" model (with a dual-core 2.7 GHz Intel Core i7-2620M processor) when running Windows under Boot Camp.
The magazine originally thought that Turbo Boost had been disabled under OS X as well, but then tests by AnandTech showed that it was only disabled under Windows. "We first noticed a problem when the benchmarks finished five full runs and the results popped up on screen: the times taken to complete several of the most intensive tests were rising with each run" says PC Pro. "This would suggest an overheating problem, so we ran a temperature monitor to find out how hot this Sandy Bridge CPU was getting."
In fact, the CPU was reaching around 93°C -- almost 200°F. "93°C is not necessarily too high for a modern CPU, but it is the root cause of the bigger performance problem." PC Pro says they're sure the processor isn't turning off Turbo Boost dynamically, since it didn't work at all during their week of testing no matter what the CPU temperature was. Also, the cheaper model with the i5 processor did use Turbo Boost, as did the i7 model under OS X.
And after measuring the underside temperature of the top-end model at 60°C -- 140°F -- they conclude that it might actually be a better deal to buy the cheaper 13-inch MacBook Pro. If Turbo Boost is disabled on the higher model, the lower-end version will actually run Windows faster than the more expensive MacBook Pro.
(Edited to make clear that the problem as tested manifested in i7 13" MacBook Pros).
Share
Apple may have been aware for some time of the problem of new MacBook Pros crashing under heavy loads. According to the UK's PC Pro...
Add a Comment
Not sure what the fuss is all about: my sandy bridge i7-2600k with the stock intel CPU fan always runs around 90C under load (Windows 7 Ult, 16gb ram) its factory set to power off at 99C (it doesnt).
From the other early adopters online I speak to this seems normal: i7s, 1st or 2nd gen, run hot. Welcome to the world of the i7 quad+ core. (maybe Intel should call it Hellfire?)
so I was about to take my maiden voyage into apple world and pick up my first ever MBP.
With the wife wanting an iMac for xmass/next upgrade I sold myself into thinking that all I need is the 13 incher 2.7 i7 for work/photo editing/music/home movie creating/portability ... (big screen will come down the road w iMac)
Now all this talk about crashing and overheating - any advise for a first timer?
I'm surprised that after so many years Apple still can't get its MBP line to run a sensible temperature. My core2duo MBP ran far too hot to touch, at idle, and therefore use as a LAPtop. consequently, I've resisted buying another MBP since then.. and for good reason it seems. :-/
This was my stance on the iMacs as well, since the graphics card on my old iMac overheated. I said I wasn't going to buy another iMac until they redesign it.....Getting to be the point where I'm running out of options....
March 22 2011 at 2:36 PM Report abuse Permalink rate up rate down ReplyIsn't the 2.3 Ghz quad-core the high-end?
March 22 2011 at 10:11 AM Report abuse Permalink rate up rate down ReplyHmm... I can see that being a problem under windows. I remember back in 2003, we had many servers (hp, IBM, others) where we had to turn off hyper-threading to keep them from crashing. Windows OS could not handle hyper-threading when some apps were putting a load on the server.
But as for people reporting it with only mac apps running, I hope it is fixed soon. Maybe it is hitting one of the bad controllers that Intel said not to use?
I use smc fan control in all my apple products-mac mini- mac book pro & iMac. Fans are cheaper than other components in your puter. At the genius bar they told me fans would run around $150 to replace... VS motherboard-video card etc. It is not that loud & it's nice not to gave my mbp burning my lap;-)
March 22 2011 at 4:29 AM Report abuse Permalink rate up rate down ReplyJust download smc fan control, I keep the fans humming along at 6000 rpm all the time and my temp never exceeds 100 F. For the windows side I initially start on Mac o/s then reboot to vista and the fans continue at their current speed of 6000 rpm.
March 22 2011 at 12:32 AM Report abuse Permalink rate up rate down ReplyWhy do you want to kill your MacBook's fans?
To say nothing of the noise, good lord!
Now, now; what kind of an Apple laptop would it be if you couldn't even bring water to a boil with it? It's a proud tradition, don't knock it.
March 21 2011 at 10:56 PM Report abuse Permalink rate up rate down ReplyYeah this is just more sloppy blogging on what others blogs said.
The 13" MBP at 2.7 GHz will outperform the 2.2 GHz even if the lower speed model is fully clocked up to its max dual core speed of 2.6 GHz and the 2.7 GHz has Turbo Boost disabled (numbers from the Anandtech article cited). Even so, this is only considering the 13" model. The "top-end" MBP is the 2.3 GHz quad core 15"/17" model, which with discrete graphics, is the apparent source of the overheating and crashing problems (previously on TUAW it was reported that going to integrated graphics only on these models eliminated the crashing issue). The 13" models only get integrated Intel graphics, and overheating in these would indicate that Apple is not properly cooling the CPU, not the GPU (Sandy Bridge integrated graphics is on-die with the CPU). Then, of course, if as throated the crashing happens under heavy graphics load, this would be odd.
But as you said, Boot Camp has had thermal issues for years. If this is true, and Apple is disabling Turbo Boost on the high-end 13" then I'd expect this to be Apple's only "fix" for it. but it would be rather ineffective, since as you also note, Turbo Boost isn't only about increasing clock speed, but also powering down cores not in use to lower the thermal profile. There must be more to why Turbo Boost is apparently disabled under Windows.
Note: This was supposed to be in reply to Joshua Meadows.
March 21 2011 at 9:27 PM Report abuse Permalink rate up rate down Reply10.6.7 fixes this issue
http://forums.macrumors.com/showthread.php?t=1120543&page=5
Deals of the Day
more deals- Refurb Mac Pro Xeon Quad-Core 2.8GHz Workstation for $1,150 + $38 s&h, more
- Used Apple iPad 32GB Wi-Fi Tablet for $200 + free shipping
- Apple iPod nano Multi-Touch 8GB MP3 Player for $100 + $8 s&h
- Cases for New iPad at HandHeldItems: Extra 20% off, $2 credit, from $3 + $3 s&h
- $15 Apple iTunes Gift Card for $8 for new Saveology customers
- Retro 80's Case for iPhone for $11 + $2 s&h
18 Comments