Hi LDUK,
All overclocks are put through an intense stress test procedure before we list them on our website. We run primes95 (CPU/Memory stress test) along with a few other benchmarks/stress tests for an extended period time, upto 24-48 hours at a time. We also monitor the temperatures throughout all of the tests.
We are confident that you will not have any stability issues with any of our overclocked PCs.
@LDUK: Thats what i ordered. Double thumbs up from me.