I've just gone through the paces to get my new MSI GeForce GTX 650 Ti OC 1GB working.
When you do it right, it's a walk in the park really. I'm running it as we speak.
I will probably do a new write up on the installation with 10.8.4 but for now I did the combo update from 10.8.2 to 10.8.4.
In essence I did it like this:
1. Got a new hdd to clone the 2TB Seagate ST2000DM001 I got. I got the same model and used CCC Carbon Copy Cloner to get a good copy of the drive. This in itself is not bootable bar with the USB stick. I got the 10.8.2 Installer stick out and used it to boot the machine, then ran Multibeast 5.1.3 to get Chimera installed. Still it won't boot as I also would have the Boot0 error, as is normal with these advanced format drives. I went into the Install, used DiskUtility to get the disk info (i.e. my installation was on disk0s2), and unmounted the drive. I then ran terminal and the command as is specified in Macman's guide on the boot0 error topic. Search for it and you will find it. It says 2 files and 2 files out or something, so that looked ok to me.
Now the cloned drive runs fine, and it is running 10.8.2. I needed a quick fallback in case I need to get busy for my real job
So, having done that, I downloaded the latest Multibeast and the 10.8.4 combo upgrade from Apple, and ran the install. A weird issue came up when the screen started to go grey, and back to normal, and to grey etc. Not flickering but in regular intervals. I was about to cancel the install and bite the bullet but the installation finally finished. I used activity monitor to see if it was doing anything and it looked like it as there was no steady lines, so disk writes etc came and went so it looked to be doing something.
Finished... now before restarting you need to run MB as you're gonna run into trouble otherwise. So I ran the setup as in my original post with DSDT, ALC892, and the Lnx2MAC nic kext, left everything else as it was, and installed that.
I then shut down the system/
First booted into the BIOS to set the Graphics card setting to PEG (PCI Express graphics) instead of the IGP. Nothing else, save and restart. Then powered the machine off (so did not restart the machine).
Installed the graphics card.... MAN WHAT A MONSTER THIS IS!!! I had not realized this as I have been running on the HD4000 for a while and before that had the GF210 which is a smallish card. Well, I called it normal. But sheesh... this thing has a heat pipe, needs external power (the Arctic Fusion 500/550 R does fine for now so I'm holding the order for a monster PSU), is big as hell (the Arctici Fusion doesn't have a long motherboard lead so it wraps around the gfx card and just reaches the terminal) and weighs a ton. It's about half the size of my motherboard! Man...!
So plugged all the cables back in, and booted.... got the boot screen, and it sailed all the way into OS X 10.8.4... without a glitch!!! No problems!!!
So now I am comfortable I can make this work with the other (original) hdd as well, but will leave it for a while and test this machine out. May get SimCity to test a few things out. And, obviously, I'm going to hook up at least one more monitor besides the HP ZR2440W I got... which was the whole purpose of this exercise!
I think so far it was well worth the few extra bucks.
I thank everybody writing about the way they installed the card under 10.8.2/3/4. Thanks for sharing!