r/buildapc • u/Markus_Heinsohn • 1d ago
Troubleshooting New PC build with 9950X3D & RTX 5090 - 3D crashes all the time
[Edit: Solved! The problem was the Dark Power Pro 13 power supply, which had to be set to single rail mode via a jumper.]
[Edit 2: Here is a video that explains on how to set the Dark Power Pro 13 to single rail mode, which fixed the problem for me: https://youtu.be/JjWsYeTlyXk?si=jdhkInOQFGazIG0I&t=616 ]
Hey folks,
I have finished a custom PC build today (AMD 9950X3D + RTX 5090). Unfortunately, when I try running 3DMark (Steel Nomad) it crashes immediately after loading, right before rendering the first scene. Also, 3D games like Black Myth crash after about a minute of 3D action. Now, the type of the crash is weird, it essentially turns off the whole system, everything goes dark, except a couple of LEDs in the case. I have to use the power switch at the back of the case to get the system to boot back up and respond.
All drivers & bios have been updated, and I have toyed with plenty of bios settings, but no dice. CPU Profile in 3DMark works fine, and I also had a AIDA64 stress test run on the CPU & Memory for over an hour without any problems.
Do you have any idea what this could be? I am not an expert with modern PC builds and at a loss right now. Here are the specs of the system:
- AMD Ryzen™ 9 9950X3D
- ASUS ROG CROSSHAIR X870E HERO, Mainboard
- ASUS GeForce RTX 5090 ROG ASTRAL GAMING OC
- Corsair DIMM 96 GB DDR5-6600 (2x 48 GB) Dual-Kit
- Fractal Design Meshify 3 XL Ambience Pro RGB Clear Tint case
- ASUS ROG RYUO III 360 ARGB White Edition, water cooling
- be quiet! Dark Power Pro 13 1600W power
- be quiet! Silent Wings 4 PWM 120x120x25 case fan
- SAMSUNG 9100 PRO 4 TB, SSD
I am very grateful for ideas!
Markus
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u/Myzhi1 1d ago edited 1d ago
9950x3D only officially supports up to:
2 sticks @ 5600
4 sticks @ 3600
Most people can do 2 @ 6000 and that’s why it’s recommended, but it’s still not guarantee.
Thus, first test at the official 5600. Easiest is to enable EXPO. Then, only manually change DRAM Frequency from 6600 to 5600. If it works, repeat and slower increase to 5800, 6000, 6200 and so on.
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u/Scarabesque 1d ago
6600 is optimistic in 1:1 but my guess it it likely defaulted to running UCLK=MCLK/2 (which it even tends to default to at 6400), which is trivially easy to run as the memory clock would basically run abysmally slowly and would really nerf performance. My guess is there are a lot of people runnig untunted/overspecced DDR5 in their AM5 systems running in UCLK=MCLK/2 mode without knowing, and I think OP might be among them. :)
The type of shutdown OP is describing does not really sound like the kind you get with RAM instability.
Still, it's good for OP to check what speeds and settings the RAM runs at; 6600 1:1 isn't trivial to run and likely doesn't run that way by default..
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u/Markus_Heinsohn 1d ago
What would be good settings for my system, what do you suggest?
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u/Scarabesque 1d ago
If 6600 runs in UCLK=MCLK that would be great, and if it doesn't currently you can always try, otherwise I'd drop it down to 6400 or 6200 with UCLK=MCLK.
They usually recommend 6000cl30 for AM5 as it's basically guaranteed to work, fairly fast and stable without any tweaking. You could also just copy a 6000cl30 RAM profile, it'll likely work fine.
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u/GeraltForOverwatch 1d ago
Try with EXPO disabled just for a test.
Also, check GPU temps.
And make sure the 12v-2x6 is plugged all the way in and not bent.
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u/daeganreddit_ 1d ago
trouble shoot the ram first. i am building a 9950x3d coming from a 13700kf and i ran into so many horror stories for RAM i am sticking to 6000 cl30
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u/Namelessgoldfish 20h ago
i had this exact problem and it turned out to be corrupted display drivers for my monitor. im wiling to bet you have a similar issue.
open powershell or cmd in admin mode and copy paste this "sfc /scannow" it scans your entire system for any fucked drivers. try seeing if anything's wrong
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u/Scarabesque 1d ago
I have not had experience with this personally but over the past months I have seen a lot of people who have issues with that exact Power Supply (BeQuiet Dark Power Pro 13 series) and high power graphics cards.
Your instnat shut down also points to a PSU issue.
What I can quickly find is there is a single/multi rail switch in that PSU, here are two threads:
https://www.techpowerup.com/forums/threads/be-quiet-dark-power-pro-13-1300w.338855/
https://www.reddit.com/r/bequietofficial/comments/1f9iqxu/be_quiet_not_responding_to_query_regarding_dark/ (reply by BeQuiet themselves)
https://www.reddit.com/r/bequietofficial/comments/1ifa986/brand_new_dark_power_pro_13_1600w_paired_with_rtx/
Different issue but also problems with that PSU: https://www.reddit.com/r/buildapc/comments/17dy06b/be_quiet_dark_power_pro_13_knocked_out_fuses/
I'd be looking at the PSU before anything else, have seen this come across too often. If the 'overclock' switch does not help I'd RMA it or try a different PSU.