Sorry for the delay, had to do some more stability testing on turbo boost overclocking. If i'm gonna give tips better give good ones. Here's a whole thread dedicated to turbo oc-ing:
http://www.overclock.net/intel-cpus/689255-stable-dynamic-overclocking-i5-750-a.html#post8768335
I set up my own turbo overclock and tested for stability with Linx on 4 cores. 20 runs stable with +0.05 vcore (for a total of 1.325) and 1.17 vtt. Happy about this, I used this oc for a couple of months without any problems. Back then, I used superpi 32m run for stability test on 1 core, which ran flawless. Turbo boost works on the principle of distributing spare power from deactivated cores to the active one(s), so I thought this would still apply when overclocked. Apparently it doesn't.
Dont know what was going through my mind (not much apparently), because instead of superpi I could have also just used Linx set to run using 1 thread. Which is what I did recently and which made my oc fail fairly horribly. Had to apply +0.125 vcore (for a total of 1.4) and 1.17 vtt to finish Linx without errors. Which is almost the same I need for running 3.8 GHz at 181x21 (except 1.19 vtt). So basically I'm not that convinced anymore about using turbo-overclocking.
Now I'm wondering how many of the overclocks in the above mentioned thread would pass Linx 1 thread run. My guess: most won't. On the other hand, like I mentioned, no issues what so ever in daily use. But can't really advise it while still adhering to my Linx standard. It must be noted though i've ran cpu's overclocked for years based on hours of Prime95 stability testing. I'm pretty sure those overclocks would crumble under 5 runs Linx.
Anyways, I can't really advise to do turbo-overclocking, but here's what you should shoot for instead imho:
In bios, go to advanced core features, disable turbo mode and enable all other features (if they aren't already).
Next go back to advanced cpu settings screen, set cpu multi to x20, qpi ratio to x32, memory ratio to x8, pci-e to 100 and finally bclk to 166.
Then go to advanced voltage settings and set every voltage to the 'normal' value (this will make sure your cpu sticks to stock voltages while oc-ing)
Reboot and test for stability using Linx 0.6.8, 5 runs with all memory should suffice, 20 if you want to be really sure (check temps closely, Linx can make your cpu really really hot). In case of errors, increase vcore a little by means of the dynamic vcore setting (choosing a value here will in- or decrease vcore with that amount. You have to set it like this to make sure vcore drops in idle). I don't think this will be necessary though since my 750 was stable using stock voltages (HT could have a negative impact though).
Considering your airflow, I was a little surprised setting to outtake had a negative effect on temps. It's my experience that more out- than intake is always better. My assumption is that the enclosure is interfering. Have you tried with your pc out in the open?
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