|"I don't have that much knowledge on OCing"|
Maybe you should look into it & gain that knowledge. It would have saved you from buying a new CPU when the one you already have is capable of the performance of the new one.
"I also have a 650W PSU and I guess that's too much"
You can never have "too much". If your system only needs 250W, that's all the PSU will produce. Problems arise when the PSU & the system needs are "too close", such as using a 300W PSU for a 250W system. In that case, the PSU is running very close to max capacity & has a higher chance of failure. A 650W would be running at less than 50% capacity so is much less likley to fail. Of course, that's assuming good quality PSUs are being used. Regardless, wattage rating is not how you should judge a PSU, you should consider ALL the specs, especially the amperage ratings, amperage distribution, whether it's a single +12v rail or multi +12v rail design, whether it has an 80 plus efficiency rating, active PFC, etc.
message edited by riider