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CM releases list of ‘Haswell-Ready’ power supplies

CM released a list of Haswell-Ready power supplies but also at the same time put up some facts on their website to bust some myths about false information in regards to compatibility factor between Intel’s 4th generation desktop processor and the power supplies.

Many companies have released the list of Haswell-Ready Power supplies in the previous weeks, but CM went ahead and wanted to set some points to re-assure their power supply users. Basically, CM said that motherboard manufacturers will be having an option to toggle On/Off advanced power saving mode, and that according to their knowledge this option will be disabled by default.

To those who don’t know, Haswell Series desktop series have new power state features which would cause systems to shut down mistaking it for a power delivery issue. Though it was earlier thought that Motherboard manufacturers would be having the option to disable the newer power states, however at the time none of the motherboard manufacturers has given any confirmation about this.

CM states the following:
As with many new product launches of this scale, there has been a bit of misinformation spread regarding the recently launched line of 4th Generation Intel processors codenamed Haswell. This has been centered on PSU compatibility with these processors. We would like to clarify the situation to calm and reassure our customers and partners that they will be able to upgrade safely. A full list of Cooler Master power supplies is listed below. Please refer to these quick facts that the public should be aware of.

  •     Most power supplies don’t support Haswell – False
  •     I need a Haswell certified power supply to build a Haswell system – False
  •     Haswell only works with DC-DC Power Supplies – False
  •     Haswell only works with 80+ Gold and better Power Supplies – False
  •     Haswell requires a second 12V rail and doesn’t work with single rail Power Supplies – False
  •     On some older power supplies, Haswell consumes 5W more in idle mode – True

Among other improvements of Intel’s latest Core Processors, power consumption in idle mode has been greatly reduced from around 6W to less than 1W. This might cause some older power supplies to shut the system off when the CPU enters idle mode, or prevent the system from waking up out of sleep mode. To our knowledge all mainboard vendors will disable this advanced power saving mode by default, and no customer upgrading to Haswell should experience any issues whatsoever.

Nevertheless, should customers experience problems or would like to enable the advanced power saving mode on older power supplies that might not support it, there is a simple fix. Simply add a single silent case fan to the system and connect it to the power supply. It should provide enough additional load to keep the system running in an advanced power saving mode.

The only disadvantage would be that power savings in idle mode on such a system would only amount to around 2-3W instead of ~5W.


CM’s compatibility list is pretty extensive, starting from their Elite 350 to V series. The following is the list of Haswell Ready Power Supplies.


Series Model Haswell-ready
V Series V1000 yes
V850 yes
V700 yes
Platinum Series Silent Pro Platinum 1000 yes
Silent Pro Platinum 550 yes
Gold Series Silent Pro Gold 1200 yes
Silent Pro Gold 1000 yes
Silent Pro Gold 800 yes
Silent Pro Gold 700 yes
Silent Pro Gold 600 yes
Silent Pro Gold 550 yes
Silent Pro Gold 450 yes
Hybrid Series Silent Pro Hybrid 1300 yes
Silent Pro Hybrid 1050 yes
Silent Pro Hybrid 850 yes
M2 Series Silent Pro M2 1500 yes
Silent Pro M2 1000 yes
Silent Pro M2 850 yes
Silent Pro M2 720 yes
Silent Pro M2 620 yes
Silent Pro M2 520 yes
Silent Pro M2 420 yes
M Series Silent Pro M 1000 yes
Silent Pro M 850 yes
Silent Pro M 720 yes
Silent Pro M 620 yes
Silent Pro M 520 yes
Silent Pro M 420 yes
GX2 Series GX2 750 yes
GX2 650 yes
GX2 550 yes
GX2 450 yes
GX Series GX 750 yes
GX 650 yes
GX 550 yes
GX 450 yes
GX 400 yes
GX Lite GXL 700 yes
GXL 600 yes
GXL 500 yes
I Series I700 yes
I600 yes
I500 yes
G Series G700 yes
G600 yes
G500 yes
Thunder M Series Thunder M 620 yes
Thunder M 520 yes
Thunder M 420 yes
Thunder Series Thunder 700 yes
Thunder 600 yes
Thunder 500 yes
Thunder 450 yes
B Series B700 yes
B600 yes
B500 yes
Extreme2 Series EX2 725 yes
EX2 625 yes
EX2 525 yes
EX2 475 yes
Extreme EX 700 yes
EX 650 yes
EX 600 yes
EX 550 yes
EX 500 yes
EX 460 yes
EX 400 yes
EX 350 yes
Elite Series Elite 460 yes
Elite 400 yes
Elite 350 yes


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