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Archived This topic has been archived.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
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