Printed from http://www.electronista.com

Retina MacBook Pro EFI update causing processor slowdown?

updated 02:45 am EST, Wed November 14, 2012

Sporadic reports of lower thermal thresholds, GPU underclocking

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.



By Electronista Staff
toggle

Comments

Login Here

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

toggle

Network Headlines

toggle

Most Popular

Sponsor

Recent Reviews

Logitech Hyperion Fury mouse

Selecting the correct gaming mouse comes down to finding a device that balances the needs of a user with a price they can afford. Ofte ...

Life n Soul BM211 Bluetooth speaker

Bluetooth speakers aren't only for listening to some music at the park or on a long bus ride, but can also be built with tablets in mi ...

Epson PowerLite Home Cinema 2030 projector

With high-definition televisions now the standard, 4K televisions becoming the next big thing, and plasma TVs going the way of the din ...

Sponsor

toggle

Most Commented

 
toggle

Popular News