539 - Power supply wattage insufficient for LR dimm memory configuration

[RAMSES_II]

Hello!

After upgrading to 8 x 32GB LPDDR4 Dimm, my system started displaying the POST ERROR “539 - Power supply wattage insufficient for LR dimm memory configuration”. This boot error is also present with one memory module. Do I need to upgrade my original 525W power supply to 700W+? Or what does this boot error mean and how do I get rid of it without pressing Enter?

[DGroves]

LR dimms (Load Reduced) are used in large capacity dimms usually 64gb or larger but some 32gb modules were also produced

LR dimms are different than normal dimms electrically and can not be mixed with non LR dimms 

not all memory controllers on motherboards will support LR dimms

and i believe the z440 is one such system that does not have official support for LR dimms

upgrading the power supply may or may not be necessary depending on your system config

one that has a high wattage cpu several mech drives and a power hungry video card will need the upgraded supply where as a low wattage cpu one HD and low power vid card will not

since used working 700 watt z440 supplies can be found for as little as 30.00 it may be worthwhile to get one  no matter what

https://pcserverandparts.com/hp-hp-dps-700ab-1-z440-workstation-700w-power-supply-used-719795-004-85...

and as i recall when all dimms are installed the optional z440 memory cooling kit must be installed

Memory Cooling Solution Cooling Fan Baffle J2R52AA 748799-001 

i personally haven't worked on the z440's but another forum member "SDH" has and can provide more details

[SDH]

Agree with DGroves.

No LR listed in the HP memory specifications, in the latest QuickSpecs for the Z440.

I'd always want the middle or highest power supply.  So inexpensive to buy recycled now and never have gotten a bad recycled HP power supply from eBay.

The Z440 active memory cooling "saddle" is 748799-001 (its HP Assembly P/N) and costs $30.00 USD on eBay shipping included. I put one of those in each of our Z440 builds (plus a front cooling fan kit). Here is from the Z440 QuickSpecs v36, attached below:

"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).
NOTE: Factory-configured CTO (xxxxxAV) and aftermarket AMO (xxxxxAA, xxxxxAT) HP memory part numbers designated as “2133” or “2400” will be transitioned to using 2666MHz speed memory components. This does not affect HP part number availability, nor does it affect system performance or operation. All hardware configurations currently supporting HP memory part numbers designated as “2133” or “2400” have been tested to work with 2666MHz memory and are fully supported by HP under standard support terms."

I bought recycled HP 2933 ECC buffered memory originally meant for the Xeon Z4 G4 workstations and that works great also with the Z440 v4 processors... it auto-downregulates to the slower maximum needs of those processors. The fastest Z440 v4 processors max out at 2400 MT/s but we wanted to migrate the memory up when we moved from the Z440 to the next generation of workstations.

[RAMSES_II]

But LRDDR4 work perfect...

It's not the motherboard that has a problem with memory, it's the chipset and the processor. So why not release a normal BIOS with support for this memory. But no, you have to keep messing with my life so that I can go out and buy a higher version of the workstation. This situation looks worse than with no-name Chinese boards. They cram backdoors everywhere, but at least they put everything they can and even more in the BIOS, just to make it easier to use.

[DGroves]

actually the issue is with your decision to use a UNSUPPORTED MEMORY CONFIGURATION and as such any issues/problems will rest with  you not HP

while some unapproved parts may work, any validation of said parts rest with the user,....not HP

 because your having issues with something that is not a vender approved configuration/part there is little the users on this forum or HP can do..........all i can say is installing a supported configuration and then asking for help from the vender or a vender forum if having a issue is usually more productive

[RAMSES_II]

That's right - “not approved by the manufacturer”. What's more, the manufacturer has inserted support for processors and chipsets that support this memory and do not require any additional components on the motherboard. The manufacturer's role was to build all possible use cases into the board. Instead, the manufacturer only limited the use of the device if it deviated from the original. This limited the user's ability to choose components, and let me remind you once again: the processor and chipset support this memory perfectly.