Apple Event: May 7th at 7 am PT
Our 2007 iMac 2.4G Core2Duo (7,1) doesn't boot into 64-bit mode when holding down the 6 and 4 keys in 10.6.8.
We were wondering if this has changed in Lion, as we're wanting to run Adobe Lightroom 4 which seems to require 64-bit mode.
TIA!
MacBook Pro, Mac OS X (10.6.8), 15" 2.5GHz C2D 6MB RAM
If your machine has the ability to boot into 64bit mode it will automatically with Lion. Lion is a 64 bit OS so it will default boot to 64 bit.
Willie, This says your iMac is too old to boot into 64 bit.
http://support.apple.com/kb/HT3770?viewlocale=en_US&locale=en_US
Actually if you want to find out for sure if your iMac has the ability to run in 64bit then please open a Terminal session and copy and paste:
ioreg -l -p IODeviceTree | grep firmware-abi
paste it. If it returns EFI64 then it will run in 64bit just fine. However if it returns with EFI32 then the previous poster was correct.
Thanks for all the replies, folks!!
The terminal commands returned EFI64, so I'll make a Lion installer drive and give that a try on a backup and report back.
I found a post about Mountain Lion compatibility on another forum that said that the 7,1 model was
64-bit capable but disabled in firmware when released until more developers had a chance to update
their apps for 64-bit compatibility.
Thanks again!
Your welcome.
BTW, when replying to a post, please click "Reply in the post you are replying to, othewise we cannot tell who your communication is directed to.
Can an iMac (7,1) be booted into 64-bit mode in Lion?
