Following an extensive internal testing program, FSP has formally confirmed which of the company’s power supply units are compatible with Intel’s new 4th Generation “Haswell” processors. According to the release notes, the criteria for compatibility was the ability to provide 18A at 12V2 peak and 0.05A during Haswell’s C6 / C7 sleep states.
The full list of compatible models is available below.
|Aurum (Double Forward)400 W500 WAurum (Active-Clamp, MIA IC)600 W700 W550 WAurum CM (Active-Clamp, MIA IC)550 W650 W750 WAurum Pro (Full Bridge, LLC)850 W1000 W1200 WAurum S (Active-Clamp, MIA IC)400 W450 W500 W550 W600 W||Aurum S (Active-Clamp, MIA IC)650 W700 W750 W Aurum Xilenser (LLC)400 W500 WAurum 92+ (Active-Clamp, MIA IC)400 W500 W650 WHexa (Double Forward)400 W500 W600 WRaider (Active-Clamp, MIA IC)450 W550 W650 W750 W|
You might have to make an adjustment in the BIOS to disable the sleep state.
"Before we proceed, we should be clear about one thing: you don't, strictly speaking, need one of these "Haswell-ready" PSUs to build a Haswell system. Corsair told us that it "fully expects" motherboard makers to let users disable the new low-power power state in the firmware. Cooler Master went even further, stating that, to its knowledge, "all mainboard vendors" will disable the new low-power state in their boards by default. In other words, you may never encounter any issues even if you pair a Haswell platform with an incompatible power supply."
Practically speaking, there are enough PSUs that have a tendency to misbehave at low loads mainly due to being built around the assumption that no PCs use that little power to make Haswell certification a marketable gimmick.
Gotta appreciate the irony of having to switch from being particularly worried about performance at high power to worrying about performance at low power that got neglected due to almost no computers using that little power before.
So those idiots from Intel didn't only make a new socket and force me to buy a new motherboard, but now they force people to buy new psu?
It's forcing the companies that build psu's to make a quality product that may cost more to build but these are the same psu's that usually get the silver gold and platinum ratings and are more energy efficient. Most people that build gaming machines will already have bought psu that'll work just fine because they offer a more stable pc
1 or 2 high performance hard drives would fix the issue as they would make up any required minimums for you.
If a system was lets say mitx(since the boards take even less power) with no video card(even an AMD card with zerocore takes more power than the cpu in its dead idle state in this case) and add a single SSD. You may be able to hit the limits on some power supplies, but a majority of newer power supplies are efficient and fully functional at low loads.
My ITX system can idle as low as about 21 watts if I trust APC's software for my UPS. So the DC load is even lower and I am willing to bet it is not that efficient at these loads. No problems for the current 300 watt FSP in the system.
I'm betting there are about just as many PSUs that fail to reliably deliver anywhere close to their apparent output power rating as there are PSUs that have problems with Haswell's extremely low idle power.
This merely raises the bar on minimum quality one little notch - PSU manufacturers cannot afford to overlook their PSU's low-output stability anymore. Thankfully for us, many of the changes required to improve low-power stability are the same that are required for high-power stability.
I will wait for the Broadwell to be released and I really hope that Intel will not botch up this cpu like they did with the poor Haswell.