Maybe jumping ahead of myself a bit with this, since it’s not yet in my hands (and probably won’t be until later this week), but a friend was starting some spring cleaning and said they had a 2007 aluminium iMac they were getting rid of — no mouse or keyboard, but does at least have the power cord. Because I know little more than that, I’m guessing it’s gonna be the base,
20-inch 2.0GHz model with nothing more.
So in prepping for its imminent arrival, I’m fluttering about and looking at how one can upgrade its innards. What comes to mind is
the Hrutkay iMac which was upgraded to a Penryn CPU (which one? no idea). Why no idea? Well, there is a mess of conflicting and
guessucated assumptions about whether the only two Penryn CPUs which will work here are the C2D T9300 (2.5GHz) and T9500 (2.6GHz) — the latter of which lives in my A1261 — or whether a third, a 2.8GHz
Core 2 Extreme X9000 (with 6MB FSB cache), may also work.
This is where a lot of
old,
arguably sus anecdata; limited testing on
prototype-spec X9000s; and a lot of
guessucated conclusions (I’m kind of enjoying this neologism and portmanteau to make an English prof cry in their tea) suggest the X9000
will run. But Apple’s lack of writing in the configuration specifics for this CPU, never to be included in an Apple product, suggests this may invoke the system to downclock the CPU to quarter-speed, to 0.7GHz(!!!). That said, other
anecdata suggest the reported low clock speed (in this case, they tested
a T9500 in the iMac to find the same) is
not the actual performance speed (which is, probably, exactly 2.8GHz).
What none of the online remarks addresses (mostly cos they’re too old, the latest being 2018) is whether running an OCLP patch with that CPU in place might offer a workaround to allow that CPU run at its intended clock speed, assuming it isn’t (and that those anecdata reports of the actual performance speed not being downclocked, despite what System Profiler claims). Whilst
very old posts on the MR forums argue it’s
not doable, somewhat later ones from less questionable references suggest it
may be doable.
With respect to OCLP and an X9000 dropped into a mid-2007 iMac, I feel like the folks who are gonna know definitively and/or have actually tinkered with that combination, and who have the chops to describe why or why not this works, are
@dosdude1 and
@LightBulbFun (LBF, I might add,
did chime in on one of these
ca. 2018 threads about pondering the possibility of flashing an iMac7,1 board to an iMac8,1, but to my knowledge, hasn’t been tried).
But first… I gotta get the hecking freebie home.