MacNN | Retina MacBook Pro EFI update causing processor slowdown?
Mac News Network View: Standard | Headlines | Categorized | Slim
Mac News Network
Mac News iPod News Reviews Forums
 

Desktop Headlines
Retina MacBook Pro EFI update causing processor slowdown?
Wednesday, November 14, 2012 @ 2:45am

According to scattered reports on the Apple Support Forums, some users who have applied Apple's latest extensible firmware interface (EFI) update are experiencing reduced frame rates while running graphically-intensive applications on the Nvidia GeForce GT 650M graphic chipset. The problems are inconsistent, and temporarily fixed by a SMC reset. The issue mostly affects waking a computer from sleep, gaming, or using Windows in Boot Camp.



Users report dramatic throttling of processor and graphical processing unit speeds when very conservative but high core temperatures are reached. One forum member claims to be seeing the speed reductions kick in at about 65C, with a second drop at 80C. The maximum temperature the processors are able to reach without damage according to Intel is 105C. Some speculation exists that the new lower thresholds and under-clocking of the GPU are intentional and were established to eliminate a persistent whine that is sporadically manifested when the computer is placed under heavy load, or to prevent overheating of the computer when in general use. Other theories suspect a miscommunication between the firmware and the thermal bridges used to monitor core temperatures. MacNN is attempting to reproduce the issue and is performing some tests on specific thermal loads where the processor clock speed is reduced. This article will be updated with more information as it becomes available.

Comments on this Article
Print Friendly Version
Email to a Friend
Add MacNN to Your RSS Feeds
Buy from the Apple Store


Related Stories:

Today's MacNN Stories:

  • Apple CEO Tim Cook comes out as gay in new essay - 9:25 AM EST
  • Hands On: Pandemic 2.5 (iOS) - 7:38 AM EST
  • Apple, Samsung still tops in smartphone market, but Xaiomi rising fast - 12:44 AM EST

    Today's iPodNN Stories:
  • LG Display develops screen for smartphones with 0.7mm bezel - 9:21 AM EST
  • Motorola buyout deal closed, mobile device maker now Lenovo subsidiary - 8:47 AM EST
  • Briefly: Gold Moto 360 spotted, YouTube enables 60fps video playback - 7:56 AM EST
  • Nintendo working with ResMed on non-contact sleep tracking device - 6:58 AM EST
  • Lenovo grows Yoga Tablet 2 series with 13-inch Windows version - 10:13 PM EST
  • No comments posted on this story yet. Please post yours.
    Your Comments
    In order to post comments, you must be a registered member of the MacNN Forums and logged in. Please login with your MacNN Forums username and password.

    MacNN Forums Login:

    MacNN Forums Password:

    Not a member of the MacNN forums? Register now for free.