1. You don't have one unless you created one.

2. Yes you could if you had one.

3. Either in root or /Extra

4. Basic patching to use a DSDT patcher .. I prefer DSDT Patcher GUI over DSDT Patcher, which run in terminal program. More specific patching you use iASLme.

5. Search Forums

6. No ... Macs don't need an DSDT

7. -

8. Yes, iASLme will make a file that you can edit.

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Gigabyte EX58-UD5 - i7 920 @ 3.2 GHx - eVGA 8800GT
Asus P5Q Deluxe - E8400 @ 3.6 GHz - Asus 7900GT
iMac 2.2 GHz - 4 MB