@HoreaG
Your
2009 2cduo 13" MBP can go up to
dosdude1/Mojave (last version for 32bit-Aps) and
OCLP/Monterey or Ventura (but without Metal-support). Monterey runs decent, Sequioa is a bit struggling and maybe more a proof-of-concept.
I've done that on my late2008 2,4GHz 13"MB Unibody with 8GB RAM, dd1/Mojave + OCLP/Ventura and both run in a decent speed.
(Before that I was quite happy with dosdude1-patched Mojave on my early2008 15" MBP4,1 with 6GB RAM for some time).
Your
2012 i7 dualcore 13" MBP with 16GB RAM is fine with
native-Mojave (for 32bit-Apps) and
OCLP/Monterey-Sequoia.
My daily driver for on the go is a 2013 i7 11"MBA (8GB RAM / 2TB NVMe) with MultiBoot of native-Mojave / OCLP-Ventura / OCLP-Sequoia and a separate Volume for the plethora of my personal files and backups.
Problem with macOS beyond Mojave is the indexing of media (mainly photographs), which is causing permanent distress for the CPU. That may cause the difference You notice in performance between Your two 13" MBP.
Up to dosdude1-patched or native Mojave (or earlier) You don't have to bother about media-indexing. Beyond you should and switch it of by a terminal command, which isn't necessary for OCLP-patched Macs, since media-analysis is switched of through the OCLP-patching routines anyway. (read more here
#125)
If You concider to try out a DualBoot-Machine with Mojave plus OCLP-patched macOS, You better start from the scratch!
The SSD should be erased completely and be reformatted in
GIUD/APFS file-system.
With
single Container, that holds separate
Volumes for
(a) dd1-patched (c2duo) or native (i7) Mojave,
(b) personal files
(c/d/e) OCLP-patched Monterey, Ventura and/or Sequoia
You'll need a 32GB-USB2/3 stick for each version:
- native Mojave (i7)
- dosdude1-patched Mojave (c2duo)
- OCLP-patched Monterey up to Sequioa (a separeta stick for both the c2duo and the i7)
Things can be done in this sequence (done this several times):
1) get the dd1-mojave patcher; download MojaveInstaller through the PatcherApp; Create the USB-Installer
2) start the MojaveInstaller-USB-Stick; erase the internal SSD (GUID/APFS), create separate Volumes for Mojave + PersonnalData + Monterey/Ventura/Sequoia.
3) Install Mojave, only for the c2duo Reboot from the USB-Stick and Patch Mojave through the PostInstall-procedure. (the i7 can run Mojave natively and You don't have to run PostInstall-Patching)
4) Launch Mojave, download/install the OCLP-Patcher.App.
5) download the macOS-installer and create the installer-USB-stick through the OCLP.App
6) Bless the USB-Stick and the SSD with the OC-EFIBoot
7) 2-Step Reboot (hold ALT) from the USB-Stick (1) EFiBoot => (2) Installer
8) Install macOS on the provided Volume and perform Patching.
9) perform step 5-9 for an addition Volume/macOS-version.
You'll have to create the USB-sticks with the Patching-Apps provided from
-
dosdude1 (Mojave) or
-
OCLP (Monterey up to Sequoia)
since the process of creating the USB-stick will also add specific files mandatory for installing/patching and when it comes to OCLP are specific for each Mac-model !
For more informations thorougly read the
how-to's provided from dosdude1 and the OCLP-team.
For the installation of Ventura and beyond on the c2duo 2009 13" MBP You'll need to provide
an USB2-Hub and an external keyboard/mouse,
since Ventura and beyond do not provide drivers for USB1 (mouse and keyboard)
until the system was patched by OCLP.
(Maybe preparing the USB-stick through the OCLP-App may also include a workaround now ...)
So, that's it. No rocket-science.
dosdude1 and the team behind OCLP did a marvellous job to make the installation and patching as easy as possible,
and prevent valuable legacy Macs from beeing doomned.
Feel free to ask questions,
and have fun!
Cheers,
@bobesch