• ×
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.Windows 11 Support Center.
  • post a message
  • ×
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.Windows 11 Support Center.
  • post a message
HP Recommended
HP z440

Hello. I recently bought a refurbished Z440 online, and some ECC ram for it (64gb, 4 sticks of dual rank registered ECC ram). I have been able to install the RAM, and the computer runs just fine.

However, upon bootup I get warning 539 - Power supply wattage insufficient for LR dimm memory configuration

The thing is, the power supply says that it is a 700W power supply on the side of it. I believe that this is the "high power" option for the Z440 anyways, and regardless since I am running an SSD and no graphics card, 700W should be more than enough for one 150w CPU and 4 sticks of memory regardless of what type the memory is.

I cant even find any documentation as to which power supply would be required, or which one the computer thinks it has. Maybe it actually thinks 700W is insufficient and I need 1200W or something?? But I dont, because I have no graphics card.

Basically I just want the warning to go away. I know the power supply is sufficient. Otherwise I have to be present to press enter every time the machine reboots, which is a headache. I am open to any suggestions other than removing the memory! 

HP Recommended

yes the 700 watt supply is the optional upgraded one (stock is 525 watt) and you should have a 140 watt cpu installed like a xeon 1680 v4 cpu


"LR" (load reduced) dimms are not recommended for the z440 i suspect the error warning will not appear once the correct ram is installed



DDR4-2133 ECC Registered DIMMs
16GB DDR4-2133 ECC Registered RAM J9P83AA 1,2
8GB DDR4-2133 ECC Registered RAM J9P82AA 1,2
HP 32GB (1x32GB) DDR4-2400 ECC Reg RAM T9V41AA 1,2
HP 16GB (1x16GB) DDR4-2400 ECC Reg RAM T9V40AA 1,2
HP 8GB (1x8GB) DDR4-2400 ECC Reg RAM T9V39AA 1,2
HP 4GB (1x4GB) DDR4-2400 ECC Reg RAM T9V38AA 1,2


For details on the supported memory configurations on the HP Z440 Workstation, please refer to the
System Technical Specifications - System Board section of this document.
Each processor supports up to 4 channels of DDR4 memory. To realize full performance at least 1
DIMM must be inserted into each channel.
The CPUs determine the speed at which the memory is clocked. If an 2133MT/s capable CPU is used in
the system, the maximum speed the memory will run at is 2133MT/s, regardless of the specified
speed of the memory.

NOTE 1: ONLY registered DDR4 DIMMs are supported. DDR3 DIMMs ARE NOT SUPPORTED.
NOTE 2: Configurations of greater than 4x memory DIMMs or that include 32GB DIMMs require the HP
Z440 Memory Cooling Solution, which is available both CTO (J2R51AV) and AMO (J2R52AA).



HP Recommended

Hmmm ok so I think I miiight see what you mean. On page 65 of this document, HP specifically mentions the use of LRDIMMS but *only* in relation to the Z640 or Z840. (http://h10032.www1.hp.com/ctg/Manual/c04823811)

I pulled up images of the motherboards for Z440 and Z640. The power connector to the CPU and RAM section for  is identical. So no worries there..

I suppose it is possible that the system designers expected LRDIMMs to be used in 128gb memory configurations... 

But I'm still not 100% convinced of the argument that the error message is due to lazy checking of hardware. (I get the error with only a single stick in, when clearly I am not going to exceed any power supply limits anywhere with a 700W supply)

Is there a way to tell what power supply the system thinks it has installed? 

and finally, is there a way to completely disable error checking so that this message does not appear?

† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.