Is it stable?

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lol no, 15IBT runs usually means 24 hr p95 stability, 20 is way past that. I know that when I tested my Q6600 overclock at 3.861 and it passed 60IBT runs that equalled to 33 hrs of P95 stability, before I shut of p95 out of boredom.

Out of curiosity where did your IBT fail, towards the end?

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200 IBT?
General concesus is that's extreme level of stability and if your oc can pass that you should bump up the fsb a notch. IBT generally puts a lot more stress on the cpu vcore settings, if that or other cpu voltage settings are too low you'll know right away. P95 is good for determining if your northbridge voltage settings are correct, IBT isn't as good at pinging northbridge / memory voltage settings.

Well both test different things and IBT definitely pushes harder. 200 runs of IBT shouldn't take you 24 hours but it will find errors if you have them. Prime95 doesn't do as good of a job finding errors as IBT does, that's why you need to run it for so long. Sometimes errors don't come up until hour 20+. 200 runs and 24 hours don't equal each other. They are just the standard that people, at least myself, recommend for the different levels of stress that the different programs put on the CPU. Personally I would run IBT before P95 but it is all preference. If 24 hours in P95 passes and that proves to you that it's stable, then it's stable. In reality, every program does something different so you're bound to have an error or two on another program unless your overclock is completely stable. /rambling

*Edit* I know 200 is extreme but I've seen several people recommend it and I have learned to do the same. If 200 is for extreme stability, then I apologize for the mix up, but it still helps to know your system is perfect. =]

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Thats nothing to worry about, try running 120 IBT runs, at maximum memory setting.

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lol, I usually run IBT first as well to test out fsb / voltage settings. From my personal experience I found it to be a lot faster and yet as accurate (as p95) method at figuring out best fsb / voltage / ram settings. Usually I do 20 IBT runs for initial settings test, then 40 and 60 to finalize everything up. The most I ever do is 120 but IMO thats supposedly insures your overclock to be near lifetime stable. After that I run p95 or dual p95s for 24hrs+ for final testing and settings validation. Over at xs, the person who started the original IBT thread, his system was 40+ hrs p95 stable yet locked up in just two IBT runs.