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The Startech USB PCIe card with UASP came in and seems to allow for much better simultaneous HDD write speeds. Oddly it doesn't seem to perform as well as the USB hub, but it's definitely much better for moving files between drives than the onboard USB ports. I also replaced the HDD sleds that had deteriorated mounting grommets so I have two less external HDDs to hook up via USB enclosures. I am still curious if a multichannel USB PCIe card would have been the ultimate solution though.

Good news. The sleds I ordered have arrived and the grommets on it haven't deteriorated. The rubber washers and screws haven't come in yet, but when they do I guess I'll have them as back up for when the grommets do crumble apart.

I guess I feel a little less dumb after posting this and folks not chiming in. Please . . . if anyone knows the answer then it would help me quite a bit.

Stuff some dry rice in a sock and put it in there?

I ordered something @Radium_Angel recommended last night. They're longer screws with rubber washers and I'm hoping that does the trick. https://www.amazon.com/dp/B07DFXN4X3?psc=1&smid=A8CV72D2OP6QC&ref_=chk_typ_imgToDp

I'm trying to figure out how I can get all (4) of my external HDDs to run at full speed (~150 MBps). They're plugged into a Lenovo P300 which is about 6~7 years old with an Intel 220 chipset and a Xeon E3 1276 v3. The USB 3.0 ports on it don't seem to have UASP support and the latest Intel drivers are from years ago and for Windows 7. The behavior I am seeing is when more than one drive is plugged directly into the USB 3.0 ports on the PC then one drive will run full speed and the rest drop to about 20~40 MBps transfer speeds. If I plug the four HDDs into a USB hub then that reduced speed only happens to one of the four drives. I'm assuming the first three HDDs are saturating the 5 Gbps? And why does the hub allow the drives to run at full speed? Does the hub support UASP? To cure the speeds I seen when plugging directly into the USB ports on the PC do I need a USB PCIe card with UASP support or a multi-channel card? I've ordered a 4 port Startech card with UASP support, but that won't be here for a few more days.

Sorry, it looks like I wasn't clear that I already purchased two more of those. My concern is that the grommets on the replacements will suffer from the same problem and they won't be delivered for a few more days so I have to wait to find out. Thanks for looking it up for me though.

@Radium_Angel I apparently got the last available https://www.amazon.com/dp/B07DFXN4X3?psc=1&smid=A8CV72D2OP6QC&ref_=chk_typ_imgToDp so that worked out.

Where in the forums should I ask about external USB HDD speeds in regards to UASP versus multi-channel USB PCIe card support? I can't figure that out. And thank you again for your help.

@Radium_Angel Having found this Lenovo P300 with an Intel E3-1276 v3 and 16GB of RAM for $150 was awesome until I found that I couldn't install actual HDDs because of the sh*t sleds/caddies it comes with. Currently I have two external HDDs hooked up with the new HDDs in enclosures, but the USB ports on the machine don't seem to support UASP and unless I use a USB hub the drives suffer diminished speeds when using more than one. I've since ordered a Startech USB PCIe card with UASP to remedy the external HDD drive problem, but I don't know if UASP will solve my problem or if I need a USB PCIe card that has multiple channels.

@Radium_Angel I also found these from the same company, but no "dampers". https://smile.amazon.com/gp/product/B0159MSHPS/ref=crt_ewc_title_dp_1?ie=UTF8&psc=1&smid=A1THAZDOWP300U

I found those Gametown ones, but the first solution seems like it will work. Thank you so very much for helping me.

@Radium_Angel Do you think these will work? https://smile.amazon.com/uxcell-Laptop-Computer-Shockproof-Phillips/dp/B073ZC6MHW/ref=pd_sbs_6/145-6447613-2990755?pd_rd_w=ffM9U&pf_rd_p=a5925d26-9630-40f3-a011-d858608ac88b&pf_rd_r=JM0WB7QNM3Y7J5N32T8B&pd_rd_r=15d91aea-1aad-4650-a911-042d32be974c&pd_rd_wg=LN9UJ&pd_rd_i=B073ZC6MHW&psc=1 I can't tell from the picture of the head is wide enough to fill the holes on the sleds/caddies.

Have you found the screws? Can you tell me how to find them? And please tell me more about the Dell grommets (ie how to find them). And thank you for replying.

Amazon Prime has ruined us. Think about what LMG is and what their LTT store is. The LTT store isn't Amazon and Amazon has built out their shipping infrastructure to insane degrees. Amazon shipping/delivery rivals every shipping company in the world. LTT is a small business that ships things at the cost of the shipping services they have available to them. Also, how young are you that you think $7 shipping is expensive? That was the norm not too long ago. Have you tried shipping something yourself in the mail lately? Unless you have your own shipping service that sheet ain't cheap.

Sorry I didn't know where to put this. I recently purchased a used Lenovo Thinkstation P300 to serve as a Plex server. As you'd expect I wanted to replace the included HDD with my own. The machine has two HDD caddies, but those caddies are proprietary and in a terrible way. They are plastic sleds that flex to slide into the case enclosures and that's swell, but the way you mount the HDD into those sleds/caddies is a mix of metal peg and rubber grommet. That rubber grommet is the problem. The P300 is 6 -7 years old and those rubber grommets have deteriorated and can't be used to secure the HDD to the sled/caddy. I have found some sled/caddies on eBay and those will be here in a few days, but I'm assuming they will suffer from the same problem due to their age. Does anyone have any personal experience with the Lenovo P300 and have replaced their HDD sleds/caddies? I can't seem to find anything searching on google. I have been thinking about trying to find longer HDD screws to use with washers to secure them to the sleds/caddies, but I haven't had any luck yet. From my searching these sleds/caddies have been used in IBM machines also. The picture is from the sleds/caddies I ordered. The circled bits on mine are destroyed and can't be used. They have crumbled apart on both sleds/caddies.

Hmmmm I couldn't find it in the manual. You could also just add a touch of extra offset voltage on CPU core voltage. Like one or two steps. That should look like +.00625V or +.01250V when CPU core voltage is set to offset.

The first thing I would try is increasing Load Line Calibration then. For CPU and SOC.

How is your CPU setup in BIOS? PBO? EDC bug? What are your LLC settings? Is your CPU core voltage on Auto? What is your IF set to?

Don't forget that the 3900X has one good CCX and one not-so-good CCX.

From AMD on Reddit:

I'd guess that too. Chiplets allowed for more wiggle room with bad silicon.

If the yields are all good and or all the same then there probably won't be.

It's like Costco. You buy more and save!