OCZ recently posted a list of its power supplies that are fully compatible with Intel's new 4th Generation Core "Haswell" CPUs and their new C6 and C7 processor sleep states. The new sleep states can draw as little as 0.05A from the 12V rail, and not all power supplies (especially older models) were built with that use case in mind. Somewhat paradoxically, as power supplies have ramped up in Wattage and power delivery characterists, other PC internals have started moving in the other direction towards increased power efficiency and lower power usage overall.
OCZ seems well prepared for Haswell, however, with a number of PSUs that are already fully compatible with Haswell CPUs. Even going as far back as its Z Series which launched in 2009 are compatible, which is comforting.
The full list of Haswell compatible OCZ power supplies is available below.
MK III Silencer
MK II Silencer
Fatal1ty Gaming Series
Z Series (EOL)
With that said, even if your OCZ (or PC Power & Cooling) power supply is not on this list, it will still work in systems that utilize Intel Haswell processors. However, you will not be able to take advantage of the new power sipping C6 and C7 sleep states.
As the launch of Haswell approaches, more and more PSU manufacturers are releasing compatibility information. So far, the following companies have put together compatibility lists.