I think your hardware will be fine...though not too keen on the Koolance EXOS. But that's just me.
I'm more concerned about the OCing. Like many have said, 24hr prime stable won't mean it's completely stable. If you were to say...run 24 hr prime, 500 passes of LinX, while doing your database stuff and it doesn't crash...I'd probably say it's good to go. I've seen instances where I can run 24hr prime but I fail linX pretty quick, vice versa, or I fail prime at 25 hrs etc etc
If you feel that's a better test, I can certainly do that. Maybe even if it's prime stable for 24 and so forth, I could find the top speed it's stable at and then back it down 100Mhz or something as well. Basically as long as I can reproduce an error that has happened in the wild with a copy of the customer's db on this private machine I'll succeed in my endeavors. Thanks for the linX idea, btw. Maybe 24 hr prime, 24 hr linx...maybe even 48 hours. I'll hammer on it for a month or more maybe even total. I will probably start with a small OC and move upward as I get free time to test more. Start at 3.2 or so and move upward.