Are you sure you're not confusing "Auto" with "stock" like many new to overclocking do?
I find it hard to believe that this thing does 5GHz on air (let alone 5.7GHz on water) and yet you're boasting how it does 3.1GHz on stock voltage and how it has 3MB L2 cache. If you're boasting about such a low clock on such a "true overclocking" motherboard (yeah right), then it dashes all belief that it "easily" does so much higher.
Ughm, I hate to burst your bubble, but I have as much L2 cache per core as you do on your entire CPU, and better yet, it's all L2 cache (no slower L3), and I also get 4.0GHz at less voltage than you're getting 3.1GHz.
5GHz engh? Well, it's not 5GHz, but I do have proof of my claim (here's some backup Phil).
Now where's yours? Where's the 5GHz on air Phenom II settings (that I get the feeling you were implying were practical for 24/7 use if water allows it an extra 700MHz and were recommending it to someone for that reason)?
These settings aren't really practical for 24/7 use, so I admit they don't "count" (and world records don't even more so, so I'm not sure what that had to do with this), so here's some that are practical.
Note that it ended up needing a bit more voltage though (a little less than ~1.4V). Failing that, ~4.3GHz isn't uncommon for 24/7 use on even the E0 stepping Core 2 Duo E8400/E8500s.
Now, let's see those 5GHz on air, realistic, practical settings. Oh, wait, that's right. Does it even 4.5GHz on air with such good temperatures, and then does it have the DAZ performance, amount of cache (yes, this does matter for PCSX2! ...and on that, the L3 cache for the Phenom II is slower than L2 cache), and clock for clock rate the Core 2 does? No? Then now you know why I recommended what I did, as the question specifically stated "for PCSX2".
Learn to read, people, instead of touting your favorites. I recommended what I did and gave reasons for doing so. I see no proof otherwise, and only reasons stating "Phenom FTW"...
And is it just me, or did you just claim you overclocked your 512MB video card to 1GB of RAM!? Ungh, I think the writing is on the wall here about your experience and knowledge of these things. Enjoy your CPU, as it's a real gem for AMD, but you're really letting this go to your head. It's not the be all end all you're acting it out to be.
A plugin author or PCSX2 coder (or whatnot) even advised the Core 2 if it's for PCSX2.
Edit: Got a bit sidetracked there and thought I was in the other thread where a user was asking between an E8400 and a Phenom II. Ah well, most of my argument still has it's place,
And to answer your question, try running Final Fantasy X in single core mode (i.e., without the MTGS option checked), and no, don't use speed hacks of any kind either. See how well that goes for your CPU.