Note current date (2017-JUL-13) and Hardware Overview:
Model Name:iMac
Model Identifier:iMac8,1
Processor Name:Intel Core 2 Duo
Processor Speed:2.4 GHz
Number Of Processors:1
Total Number Of Cores:2
L2 Cache:6 MB
Memory:1 GB
Bus Speed:1.07 GHz
Boot ROM Version:IM81.00C1.B00
SMC Version (system):1.29f1
Serial Number (system):YM829CD9ZE2
Hardware UUID:05C8EB6A-461D-5390-86B8-32BC67065DA6

For details about your Mac model, click the Apple icon at the top left of your screen, choose About This Mac, then choose More Info. These Mac models are compatible with macOS Sierra: iMac (Late 2009 or newer) and more

System Software Overview:

System Version:Mac OS X 10.6.8 (10K549)
Kernel Version:Darwin 10.8.0
Boot Volume: Macintosh hd
Boot Mode:Normal
Computer Name:Arlene Special’s iMac
User Name:Arlene Special (arlenespecial)
Secure Virtual Memory:Not Enabled
64-bit Kernel and Extensions:No
Time since boot: