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Haswell PSU Myth Busted

CMHaswellMyth

There has been a lot of talk about PSU compatibility for Intel’s upcoming 4th Generation Core Processors (code named Haswell). We have observed a large amount of misinformation being spread. 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 here. Below are some quick facts that the public should be aware.

  • 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 Intels 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.

 

Should customers experience problems nevertheless, 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 adding a single silent case fan to the system, connected to the power supply, should provide enough additional load to keep the system running in advanced power saving mode.

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

 

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

 

Many thanks to Cooler Master for providing this information

 

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