Hi! So regarding connecting the p5800x, in a normal desktop pc. My question is a year after the holy grail u.2 to pcie 4 video that Wendel posted on YouTube. His solution for full efficacy was via connecting (images for both below) PCI4-39MU3x4-EDSFF-0.5M [$154] with GENZ-1878-M2 directly into m.2 slot. Poof magic working, independent of motherboard presuming the toggle switches are done right.
Well now, di link has produced “ 𝐃𝐢𝐋𝐢𝐧𝐤𝐞𝐫 PCIe 4.0 𝐌.𝟐 𝐓𝐎 𝐔.𝟐 𝐍𝐕𝐌𝐞 SSD,𝐒𝐅𝐅-𝟖𝟔𝟑𝟗 Drive to 𝐌.𝟐 Host Adapter,U.2 SSD Converter -with Power Cable(75CM) “ [see below]. On Amazon one review suggests that it works at pcie 4 speeds with the p5800x optane. But Amazon reviews can be less than reliable. I am currently waiting for re-driver cable, but I’d return it if the 30 dollar option works.
Thoughts? Opinions? ** p.s I am a server newbie (if that), and am generally not a tech specialist. So any advice or suggestions would be hugely welcome!!!
Thank you so so much Wendell. I been pulling out my hair trying to figure out why I can’t get the p5800x past like 5400 write and 5100 read. This answers a lot. <3
P.s. I’m not a robot or a weirdo, just a little technology challenged
If it’s a chipset M.2 slot the chipset may also contribute a slowdown. There’s not much data on this but, as advertised drive speeds are the about the max possible, it’s probably best to take them as CPU lane specs as measured by DiskSpd (CrystalDiskMark uses an old version of DiskSpd).
Anecdotally, I haven’t seen measurable chipset slowdowns with 3.0 x4. With 4.0 x4, drives capable of ~7.1-7.4 GB/s lose ~1 GB/s behind Promontory 21. There’s some data that hints if there’s a B760/Z790 slowdown it might be more like ~500 MB/s.
Okay so. Seeing spots as I type this from how much back and forth and reading and finagling but…
I am currently using (temporarily) the dlinker pcie 4 75cm (I know too long), M.2 TO U.2 NVMe SSD,SFF-8639 Drive to M.2 Host Adapter,U.2 SSD Converter -with Power Cable. Fine. It works, but too be desired and too long and not reaching the speeds quoted…
I have in my possession the M.2 M-KEY PCIE GEN4 WITH REDRIVER TO GEN-Z 1C(EDSFF) ADAPTER which I am working on getting a 50cm cable for, and it is coming from Taiwan… but it’s high quality etc. so that will be my end game for the promised speed.
Now! This was all based on the Wendell holy Grail video (which I watched maybe 20 times)… but it’s so weird, the cable sku: * PCI4-39MU3x4-EDSFF-0.5M that he said worked in the video, isn’t right… like, it’s either male, or doesn’t have sata port. Trying to figure that out but… right now I have on the way, this…
Wendell, I have watched your holy grail video about 7 times, trying to find the location of the switches. Can you please describe the layout for the majority of your motherboards at pcie4 speeds? These were the best captures I was able to grab, and I cannot tell. Do the right bank have the switches in the middle or the top? It seems like the left bank is all toward the top. But can’t tell on the right bank.
did yours not come with a paper explaining what they do? are you still experiencing issues? the default switch settings are fine for 90% of u.2 cables… if you have problems your u.2 cable may be dodgy
Hi, just to be clear. I am receiving my cable on Wednesday or Thursday, therefore I am currently using the menial m.2–>u.2+(15p sata power) cable from Amazon which works but is not providing full potential. (But is still infinitely faster than nvme NAND)
I did receive the paperwork but as you said in the video, “it doesn’t say what it does, that is my job” and then you immediately show a closeup of the switches, but resulting from that plastic film, at best you can see three switches.
I have not altered the location of the switches from when I had received the adaptor. I am merely asking if you had to move any of the switches to get it working at full pcie4 speeds. (Right now they are all up) .
Anyone have any tips on those switch settings? The paper that came with the redriver is not exactly clear which switch settings do what.
Issues I’m seeing is with a P5800, latency and 4K results are 15-20% lower than a 905P. Have AER enabled, no errors. Disabled bunch of PCIe power saving stuff and set PCIe 4 speed on the M.2 slot. Got some performance but its still under what a 905P achieves. Running off CPU lanes. Cable is 50cm.
For me, 𝐃𝐢𝐋𝐢𝐧𝐤𝐞𝐫 PCIe 4.0 𝐌.𝟐 𝐓𝐎 𝐔.𝟐 𝐍𝐕𝐌𝐞 SSD,𝐒𝐅𝐅-𝟖𝟔𝟑𝟗 works fine at PCIE 4.0 speeds with P5800X connected to PCIE 5.0 M.2 and PM9A3 connected to PCIE 4.0 M.2 slots on the MSI X670E ACE motherboard.
The PM9A3 is especially sensitive to cable quality; it couldn’t even be detected when using a PCIE 3.0 variant of the M.2->U.2 cable on a Z390 board.
I came to know about that PCIE 4.0 cable after watching this youtube video.
For now, I think i figured out the switches. In short, having all of them set to 0/off, gives the best gain settings signal wise. So my issues with low 4K results might be something else.
I have experience with onboard slimsas connectors on my Supermicro server motherboards. So it was a matter of going with what was familiar more than anything else.
If I am not mistaken, Slimsas is also a newer standard. (My older Supermicro server boards had oculink, my newer ones have slimsas) I figured I might have a higher success rate with something newer. (Though I could be wrong here, I am inferring a lot from things I have not confirmed)
That, and my m.2 slot the redriver is going into is going to be underneath the cooler of my GPU. The Oculink version I saw had the mating connector flat along the board, making the connector plug straight down. it would never fit under my GPU. (Maybe there are different versions that align the Oculink connector parallel to the m.2 board? If so, Oculink would be even thinner than Slimsas, but this is what I found.)
This slimsas one has a chance. It still may not fit, but there is a chance it might. (If I have to I am breaking out the Dremel, lol.)
I’m going to test it in the Threadripper 3960x this evening and report back.
Sometimes you just have to do some trial and error. Thank goodness for Amazon’s return policy, right?
Edit:
I see that the one you referenced that LiKenun used is parallel to the board, so that one would probably have been even better for me.
If what I have doesn’t work, I’ll just return it and try getting what he got.
Same here. The one I got came with a piece of paper as an abbreviated manual. It said you could try the dip switches, but had absolutely no documentation as to what they did, as if you are just supposed to randomly flip them until something works.
thanks for clearing that up . planning on using it on itx setup .
but i would like to ask what your file transfer speeds are on windows file manager because looking at https://www.youtube.com/watch?v=qB1wAPQBwjY&t=53s , it seems to fall well below the expected spec speed . time -8;50 in the linked video
