• ×
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
  • ×
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
Guidelines
The HP Community is where owners of HP products, like you, volunteer to help each other find solutions.
Archived This topic has been archived. Information and links in this thread may no longer be available or relevant. If you have a question create a new topic by clicking here and select the appropriate board.

‎09-10-2019 09:38 AM

HP Recommended
Product: z620
I wanted to let the community know that I've installed 32GB RDIMMs in both the z420 and z620 and they *DO* work...Obviously the configuration is unsupported by HP but both Windows and ESXi have no problems with them. The only minor gremlin I've noticed is that populating 2 DIMMs/channel with quad-ranked DIMMs (as 32GB RDIMMs are) causes the system to ramp up the fans for 10-20 seconds before POSTing and it creates a bit of a noisy boot delay. But for a total of 256GB/384GB (z420/z620) of ram that's worth it! Be warned of the vagaries of Intel's support for quad-ranked RDIMMs on Ivy Bridge, though. Your memory speed will drop down to 800MHz, for example, and there's no workaround for that, so it's a tradeoff between large memory and fast memory. Note that I have *NOT* tried load-reduced DIMMs (LRDIMMs). They may work too, since they are officially supported on z820 workstations, but they'd be a similarly unsupported configuration from HP's perspective on the z420/z620. The advantage of LRDIMMs--if in fact they end up working--is that your memory speed would not drop to 800Mhz. So I think it would be worth somebody spending $75 bucks to try it out 🙂 Thanks Zach
Archived This topic has been archived. Information and links in this thread may no longer be available or relevant. If you have a question create a new topic by clicking here and select the appropriate board.
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation.
Didn't find what you were looking for? Ask the community
† 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>.