With the new Silent Pro Gold power supplies, Cooler Master wants to offer efficient 80 Plus Gold PSUs at an affordable price. The 450W model costs £50 / € 67, and the 550W model costs £60 / € 77. That makes the 550W model cheaper than most other 450W of 500W Gold power supplies on the market.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips