Samsung SSD in older Imac (24" Alu)? Trim support? I have an older 24" iMac (Model 8.1 with Mountain Lion) and would like to extend its life a bit by adding a 256GB SSD.  Samsung SSDs seem to be coming down in price (and are possibly well reusable if the iMac retires at some point) and I've looked at the tear-down of the model which appears to be doable (no glued parts).

Does anyone have experience with putting 3rd party SSDs in an older machine?  And if so, will it support SDD TRIM?
I installed a (Samsung) SSD into a late 2008 Aluminum MacBook, which worked fine.

Apple does not automatically support TRIM for drives that aren't their own, but it can be enabled, for instance with this app: http://www.groths.org/trim-enabler/

Worked for me, just needs to be re-enabled after every system software update.

And yes, my MacBook is now a lot faster, so installing an SSD can definitely breathe new life into an old machine.