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Hi Emil, I put a few more pictures on my blog post for the P3 Ultra here: https://vince.cojot.name/blog_2026_the-lenovo-p3-ultra-is-a-small-39l-and-powerful-wo.html I hope these help you. Regards, VInce

Hi @LodeRunner Your drives show firmwares with a name pattern prefix of KNEC and KNEG. As far as I know genuine HGST SN260 have a firmware prefix pattern of KNGN and the Cisco OEM firmwares have a Cisco prefix of KNCC. Your drives being KNE* I I think they will reject a non-KNE firmware by...

Yeah, the 14th gen fan response became unconfigurable after iDRAC 3.34 firmware (Dell took it away). The T630 was a lot easier to work with in this regard because the fans could still be configured manually. So my recommendation for T640 owners is to usually avoid HDDs and go with flash. in my...

@madindehead I am not sure the iDRAC wll play nice with the 18bays backplane and the absence of the middle fan tray. It's worth a try but make sure to do a flea power drain before you turn it back on so that the iDRAC forgets about the fan tray.

@chadyoshikawa Thank you for enhancing these old instructions, your set seems much cleaner!

@serverfan for these drives in 14th gen Dells, they need to be on firmware 122 (it's the only one which works if your BIOS is later than 2.13.z). they might go into diags mode and in which case the only way I found the recover them is to dump the diags: # dm-cli capture-diagnostics --file...

I received the adapters and they fit in the P3 Ultra. Will try the P350 Tiny shortly.

At any case, if official Dell/EMC SAS drives do -NOT- trigger the 43% fan reponse, then there is a glimpse of hope if we can crack this (and maybe cross-flash firmware on some drives). Interestingly, even with 5 x 16Tb WD Red Pro drives (WD161KFGX) my 18bay T640 has the fans dropping to around...

Wow, I am very surprised the 12 x 8Tb Dell/EMC drives don't trigger the 43% fan response! I had verified that even the default 1Tb dell boot drive did so I am surprised that higher capacity models work. Do you mind sharing more details about these Dell/EMC drives? Are they from an EMC NAS...

Hi @frankly Yes, unfortunately it's the HDDs. Any HDD in a T640 will make the fans go over 40%. Even a single 1Tb Dell-Branded HDD does that. The T640 iDRAC has this stupid alorithm that pushes the fans above 40% if: - an HDD is present. - some SAS/SATA SSDs are present.. and their algo does not...

The temps on all my 9400 drives are usually pretty good but I usually use them in PowerEdge Towers. For the P3 Ultra, I tried to mod the fan shroud of a GPU heatsink assembly but lost a lot of time and energy with the flimsy ADT-Link PCIe to U.2 adapter. Without active cooling and under heavy...

Do you have examples of retimers which would work in a Lenovo P3 Ultra? (SFF 3.9L chassis with low-profile slots)

I'll report here when I receive the adapters...

The new adapter: All of the others: (Look at the position of the hole...)

The above adapter might be the -reliable- solution for Lenovo Tiny PCs and (the P3/P360 Ultras). I had managed to put a 30Tb Micron 9400 in my P3 Ultra but the adapter from ADT-Link was very flimsy and I settled on Oculink because I could not find a solution which worked reliably. This new...

I just discovered this: https://www.ebay.fr/itm/167666691929 This looks like the low-profile U.2 adapter I've been looking for (without finding it)

Yes, I did but I don't recommend it. I wanted to avoid soldering so I had to -fake- the old fan so that the iDRAC wouldn't complain and the new fan ran at a fixed speed. In the end, this did not change much with either noise or cooling:

Hi @Leo137 Yes, I installed the shroud and kept the old fan for cooling.

@luckylinux I have not checked if newer versions of the firmwares were released in recent years, sorry. I did not have any SN100 drives and obtaining them was a one-shot deal for a friend, sorry again.

Ok, re-uploading, try this one: https://www.dropbox.com/scl/fo/yz2dvbslhxuzynrlo7prf/ABAlrzNQOTi4GfwhUMWqPeI?rlkey=p74n5lli4g4m2kt9bmjhsxwil&st=zicv5c3a&dl=0