U.2 to PCIe Low profile adapter

compuwizz

Member
Feb 25, 2017
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I want to use U.2 drives in a 2U server that doesn't have full height slots or an NVMe backplane.

I've seen what looks like full height U.2 to PCIe adapters for drives and physically there seems to be the ability for a half height/low profile adapter to be made but I haven't found one. Does one exist?
 

NateS

Active Member
Apr 19, 2021
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Sacramento, CA, US
There's really not enough room physically though -- keep in mind that you're measuring not from the bottom of the bracket, but from the top of the motherboard slot. The usable space is only 2.536". While yes, technically, that's more than a 2.5" U.2 drive, the remaining 0.036" is not really enough space to route the traces properly and hold the capacitors and whatnot. Even if it's not completely impossible, it'd require a much more complicated multi layer board design, and I imagine most manufacturers decided that extra cost probably isn't worth it for a somewhat niche product.
 

compuwizz

Member
Feb 25, 2017
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Thanks, I was hoping I overlooked an option. U.2 drives are a lot easier to find than AIC.
 

NateS

Active Member
Apr 19, 2021
159
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Sacramento, CA, US
Keep in mind that if your system has anywhere you can stick a 2.5" drive that's not already wired into a backplane, you can run a cable back to a PCIe or M.2 slot instead of using the kind of adapter that puts the drive in the slot directly.

For example,
Cable: https://www.amazon.com/Cable-Matters-Internal-SFF-8643-SFF-8639/dp/B0716K357W/
PCIe adapter: https://www.amazon.com/U-2-M-2-Adapter-Interface-Drive/dp/B01K1JSNLC/
M.2 adapter: https://www.amazon.com/U-2-M-2-Adapter-Interface-Drive/dp/B073WGN61Y/
 
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