I don't believe the upgrade would benefit you at all. I'm not sure your 8+ year old GPU supports the new feature and if I remember correctly all MBP's with the NVidia 8600M GPU will eventually fail from GPU failure.
Here's a link to the Apple KB article.
Which Apple fixed if it happened in the first 4 years from date of purchase.
So although your Mac may still work today tomorrow it may not.
some years ago i had this problem that all went "black", apple replaces the mainboard.
but, i hope they fixed this problem by installing a correct mainboard, so it wont get "black" (at least because of this big gpu bug).
thanks you for the answer, i also thought it wont make a difference. i might continue with lr .5.
Apple replaced it with the exact same faulty GPU, a NVidia 8600M GT, which eventually will fail just like it did the first time.
Apple stopped making that motherboard/Logic Board back in late 2008. So any and all the ones they used to do the replacements were Refurbished from the original run. There is also a process to fix the faulty soldering. You BAKE the MB/LB in an oven. That Reflows the bad soldering allowing it to work for X period of time but even those will fail eventually.
Best of Luck to you.
I gave up on Apple/Mac after my Late 2011 MBP failed from another faulty GPU. Sold it for parts and moved on. Now I see Apple has finally acknowledged the problem after thousands, if not millions, of that same model failed.