Do I need a "Haswell ready PSU" for my new i7 build?

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Bruno Koob

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Feb 13, 2014
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I am building a i7 4770k PC. Just now found out there are different type of PSUs after the power calculations. (I am now also aware of the 32 amps on the 12v rail for my gpu.) Do I need a Haswell ready PSU? What else do I need to take in account when choosing a PSU?

i7 4770k – Intel
GA-Z87-HD3 – Gigabyte
CPU Cooler- Zalman CNPS950AT
Radeon R9 270x – Asus
2X8 GB 1600MHz DDR3 – Kingston
60GB SSD - Kingston V300
1GB 7200 rpm HDD SATA 6Gbs – Western Digital
DVD burner – Asus
Internal USB bus powered card reader
PCIE Firewire Card – Rosewill
External Firewire audio interface – Focusrite Saffire Pro 14
2x 120mm case fans
 
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Potentially, yes, you need a Haswell certified PSU.
The issue is that some PSU's will not wake back up when a Haswell CPU goes into sleep mode. The certified ones have been 'certified' as ok for the job.

The quality of the product, the reputation of the manufacturer and the ease of working with their customer service (or the retailers) in the event of a problem are all factors to consider.

The PSU's wattage rating should be appropriately matched to the load that it will be supplying. Don't run a PSU near its design limits. Running a big PSU at a low load level or a small PSU near its maximum output is demanding on the equipment and not very power efficient.

In future will you ever want to run multiple Video Cards? Think about...
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hunter315

hunter315

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May 12, 2009
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The "Haswell ready" mark is just to indicate that the PSU is capable of supporting the super low power CPU sleep state that haswell introduced, the majority are and most manufacturers are working to label those that are as such. If it doesn't support that super low power sleep state the system will just shut off rather than sleeping properly.
 
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rnkavuru

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Feb 13, 2014
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no you don't need a haswell ready psu lol any psu will be fine as long as you have enough wattage.
the only reason you need a "haswell ready" psu is because some psu's don't work with the core c6 state on the newer intel processors. Core c6 doesn't effect your performance at all so you don't need it. It's only to save power when your computer is idle.
 
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2x4b

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Oct 28, 2013
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Potentially, yes, you need a Haswell certified PSU.
The issue is that some PSU's will not wake back up when a Haswell CPU goes into sleep mode. The certified ones have been 'certified' as ok for the job.

The quality of the product, the reputation of the manufacturer and the ease of working with their customer service (or the retailers) in the event of a problem are all factors to consider.

The PSU's wattage rating should be appropriately matched to the load that it will be supplying. Don't run a PSU near its design limits. Running a big PSU at a low load level or a small PSU near its maximum output is demanding on the equipment and not very power efficient.

In future will you ever want to run multiple Video Cards? Think about power consumption now and in the (near) future.

Do you want modular cables? Even semi-modular works very well for cable management. But you will pay for that feature.

Look for these protection features:
OCP (Over Current Protection): protection against power spikes
OVP (Over Voltage Protection)
OPP (Over Power Protection): overload protection, sometimes called OLP
OTP (Over Temperature Protection): protection from overheating
UVP (Under Voltage Protection)
SCP (Short Circuit Protection)
NLO (No Load Operation): this isn’t exactly protection in the same sense as the other features, but it allows the PSU to power up and function normally, even with no load.

And if you would like to read a bit more about PSU's, here is a good article from TH:
http://www.tomshardware.com/reviews/power-supply-oem-manufacturer,2913.html
 
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