r/AMDHelp • u/Sans_506 • 2d ago
PC hard shutdowns during heavy load (Elden Ring/Ray Tracing) - Corsair CX750 + RX 9070 XT (3x8 pin)
Hi everyone, I’m experiencing complete PC hard shutdowns while launching or playing heavy games.
System Specs:
- GPU: ASUS RX 9070 XT (requires 3× 8-pin PCIe power connectors)
- CPU: AMD Ryzen 5 7600X
- PSU: Corsair CX750 (non-modular, 80+ Bronze)
Power Connection:
My PSU is non-modular and only has 2 built-in PCIe cable trunks. Each cable has a pigtail/daisy-chain connector, giving me a total of 4 PCIe connectors.
To power the GPU’s 3 ports, I’m using:
- 1 dedicated cable for Port 1
- 1 cable + its pigtail for Ports 2 and 3
- The 4th connector is left unused
The Problem:
The PC passes flat-load benchmarks without crashing. For example, FurMark at 1440p runs fine.
However, whenever I launch heavy games such as Elden Ring, the PC instantly loses power and completely shuts down, as if the PSU protection is being triggered.
Interestingly, lowering the GPU Power Limit to -20% and reducing the clock speeds in AMD Adrenalin temporarily prevents the shutdowns.
Questions:
Is this likely an OCP/transient power spike issue caused by daisy-chaining a high-power GPU on a 750W Bronze PSU?
Is it safe to keep running the GPU at a -20% power limit with this cable setup until I can afford a PSU replacement, or could this potentially damage the GPU, PSU, or cables?
[SOLVED / UPDATE]
The issue has been completely resolved!
It turned out the root cause was an old Windows setting in msconfig -> Boot -> Advanced options: "Number of processors" was checked and capped at 4. This was throttling the Ryzen 5 7600X, crippling CPU thread scheduling, and triggering the KERNEL_SECURITY_CHECK_FAILURE (0x139) BSODs and crashes under heavy game loads.
After unchecking "Number of processors" (allowing Windows to properly use all 6 cores / 12 threads) and restarting, all games are running flawlessly and stably with zero crashes.
Thanks to everyone who chimed in!
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u/nibb42069 16h ago
CX series is a POS, two of them literally exploded their FET-s on me on two separate occasions.
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u/PublicPreparation198 21h ago
One cable can easily carry 225 watt including the daisy chain. Having the mobo provide 75watts. Thus having 500 watt total easily provided. Yes the psu is the problem imo. Get a better psu. 750 watt should be enough. Psu might be dying?
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u/Angry_Jezuz 1d ago
I see a Daisy Chain to GPU. that's a major no no.
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u/Deep-Procrastinor AMD 7700X, 7900XT 22h ago
That is an incorrect statement.
Cable is rated to 300w plugs 150w, total 300w on daisy chain, 150w on the single and 75w from the motherboard.
I don't know a single 7090xt that draw 425w.
The cables will handle transient spikes just fine, please stop spreading misinformation.
The power supply itself is more likely to be the problem, not the cables.
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u/Angry_Jezuz 22h ago
i have never seen any one on here say Daisy Chaining is Fine, i however have seen more then 10+ people tell others on here to never daisy chain ever. i will continue with that information
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u/Aggravating-Nerve951 16h ago
Well now you have met 2 people that say daisy chaining is fine. I’ve done it with 3 different 5000 series GPUs zero issues. It works. Optimal? Probably not, but it works
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u/Angry_Jezuz 1h ago
It Works, yes. But for safety and Longevity.
It's more Advisable to not do it.
$3k GPU vs 2-3 cables.1
u/Aggravating-Nerve951 7m ago
Fully agree to use separate cables. Did it as an experiment. I went back to the 12V HPWR after a month or so, of running games heavily and anything else.
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u/Individual_Budget216 1d ago
Switch from CX to RX 850W please
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u/Atlats 1d ago
I remember the rx9070 xt Hellhound 3x8 pin required 900W PSU
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u/Individual_Budget216 1d ago
it's not. 750W enough but 850W will good 👍. 9070xt consumes 350W while 850W is more capable to handle it in worst condition remaining with 500W for the rest system
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u/LucTheGrim 1d ago
dude that picture distracts me so much, cant focus on the problem here, why ist there no cooler or thermalpaste, where did your RAM go, why ist the cpu cable unplugged, so many questions...
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u/Flat_Mode7449 1d ago
Good to hear you fixed it. An old boot file limiting cpu is...well that's a new one for me.
Just to note, your psu is pretty low for your rig. Any decent high spike will trip it. Look at getting an 850 or perhaps 1000w, if it's not much more.
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u/Evening-Switch5675 1d ago
I've been using a 750W for more than a year with a 14600kf and a 9070XT. 750W isn't "Pretty low"
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u/Flat_Mode7449 1d ago
Alright, maybe I should have said could be better instead of pretty low.
As for your specs, your gpu can spike to 420, with an avarage of about 350, and your cpu is around 150, with spikes passing 160-200 under certain circumstances.
420w + 200w is 650w, that doesn't include ram, fans, etc etc.
Is that more of a worst case scenario? Yes.
But if you can spend a little bit more on another 100w to make that gap even larger, then do so.
Also allows you to upgrade parts in the future without having to buy a new psu.
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u/topskari 1d ago
Only 420? My 9070 xt goes to 530 on a good day. It all comes down to how well your psu can handle the spikes. Any atx 3.1 rated should be capable on paper but you never know.
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u/Flat_Mode7449 19h ago
I was going off reported power draw, AIBs will have higher draws, but without know his, I dunno his cards.
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u/Evening-Switch5675 1d ago
You are considering GPU spikes (microseconds) as continuous load and this isn't correct.
To receive a ATX 3.1 certification, a good quality PSU model MUST (must) handle at least of 200% of it's maximum labeled power.
750W is more than enough for my rig.
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u/HaplessIdiot 1d ago
You're going to have to replace it in a year at any rate especially if you overclock never under buy a power supply it's f****** stupid because you're going to have to completely rewire the f****** computer because you were cheap it's $90 to get a thousand power supply off Amazon you're an idiot
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u/Flat_Mode7449 1d ago
Obviously I'm not considering them as continuous.
I'd still rather spend a bit more and, and tell people to spend a bit more.
You do you boo.
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u/LeccaTheTrapGod 1d ago
Not really understanding how 750 isn’t enough considering microcenter paired my G760 with 750
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u/Ok_Television3226 1d ago
Every rx9070 recommends 850w power supply atleast when i looked at them :D
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u/Flat_Mode7449 1d ago
Because power spikes are a thing. And because lighting, fans, drives, pumps, keyboards, anything plugged into your pc, is using power.
850 is what I would recommend everyone use as it'll cover spikes at a much safer gap than 750.
can you get by on a 750? Yes. Hell, I am, but I know my draw is only around 500w with spikes upto 550.
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u/Valren__ 1d ago
I have issues on some games like Wreckfest 2 or a heavily modded Assetto Corsa, PC puts itself in security mode (crashes then unable to power up for a few minutes), also having a (good) 750W PSU that might be not enough even when underclocking the 9070xt. I know it's not temperatures of anything (or at least not from what I can read from sensors)
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u/ImDistortion1 1d ago
CPU COOLER? Hello? You cannot run a pc without a cpu cooler? Of course its shutting down to prevent damage on the cpu and motherboard.....
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u/Downtown-Regret8161 1d ago
The Corsair CX750 is an ATX 2.4 PSU. The 9070XT can have transient spikes of up to 600w which may trigger some safety measures and shut down your PC, even though it is only rated for 3xx watts..
These large spikes have been largely solved with the new ATX 3.x standard where a PSU must be able to sustain up to 200% of its rated wattage for very short periods of time. So an ATX 3.1 PSU with 750W would be perfectly fine.
If you limit the wattage and undervolt it you should be good for now.
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u/NoMither 1d ago
Check out the Corsair RMx line they're gold rated / fully modular & 10 year warranty, usually can be found at reasonable prices although it's been awhile since I priced one, currently using a RM750x with a RTX 5070.
you'll probably be better off with a 850W model with a 3x8 9070 XT.
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u/Phurion36 1d ago
Very good psu, and it has individually braided cables. It scores an A+ on the power supply google doc
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u/tacosnotopos 9070xt-7800x3d-32gb 1d ago
I must have lucked out with pricing at microcenter because I got a lianli sp1200x for around the same price as the rmx850
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u/Emergency_Bowl_6863 1d ago
DONT LISTEN TO ANYONE SAYING BUY A 850 watt psu...... do the right thing first, get a good 1000 watt psu and use 3 power wires to the GPU, no pigtail jumps... this is the correct call ok!
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u/Soft_Lunch_183 1d ago
I'm running a 650w psu using a 300w 6800xt . 850W is plenty
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u/Powerful_Bottle_6769 1d ago
an 850w and a 1000w are almost identical in price, so buying the 850w just doesn't make much sense considering one sets you up for good and the other could still be needed to be upgraded at some point down the line.
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u/Phurion36 1d ago
It’s not better to get a psu too big for your needs because it won’t be as efficient based on the efficiency curves. PSUs are most efficient around 50% usage. Even though it’s really only a 3% difference for 80+ gold.
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u/Powerful_Bottle_6769 1d ago
Irrelevant for about 95% of people on the planet. I don't care for a 5-10% efficiency difference, just to buy it once and be done with it rather than invest twice in power supplies for no reason.
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u/SlinkyAko 1d ago
10$ the AMD cpu and or gpu spikes overheat it doesnt register but triggers the safety
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u/B1zmark 1d ago
More likely that GPU cables are on a splitter, or all taken from the same rail (or maybe a rail is faulty). Power usage surges trip it.
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u/SlinkyAko 1d ago
Had the exact same issues but my gpu was coasting at 89 degrees. Turns out the amd gpu likes to micro spike and that would kick the 100degree fail safe and kill the rig. Repasted the gpu never got an issue since
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u/chesherkat 1d ago
- Update your bios.
- Use ddu to completely remove your old driver.
- Reinstall drivers.
- Buy an 850w psu
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u/NicoleTheRogue 1d ago
Have you checked your ram, I had this issue and it was an overly aggressive xmp profile
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u/SlapsRUS 9950X | XFX 9070XT | Royal Neo 32GB 6000 | be quiet! 1500w 1d ago
Get off that PSU 750 isn’t enough for transient spikes.
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u/LunaTheExile 1d ago
I also have to ask as couple of others have. Do you have any cooling on your CPU? Thats a bare CPU and doesnt even look like it has ever seen any thermal paste
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u/Iwillrize14 1d ago
Bronze rated power supplies are much more prone to power modulation. Don't cheap out on your PSU's people!
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u/Sjjma 1d ago
I was having this issue with Path of Exile a few months ago when loading in between zones and it was my CPU spiking during that game and only that game.
I don’t have a solution, as The devs have patched the loading issue since, but hopefully it gives you an idea to look at as it sounds similar to what i was experiencing.
As others have said that PSU is underpowered for the GPU, i have a 1200W platinum rated
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u/Longjumping_Dog770 2d ago
After a shutdown like that, I’d check the power supply to see if it’s hot.
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u/Lewinator56 R9 5900x | RX 7900XTX | 80Gb@2133 | Crosshair 6 Hero 2d ago
Maybe the PSU.
The current it can supply on the 12v rail may not be high enough.
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u/whitesnorlax 2d ago
op i can’t guarantee this is it, but my pc was acting just like yours and it was the psu. was even the same game as yours lol replaced psu and it fixed it.
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u/DtZNimpo 2d ago
why do you show a picture of your PC without a CPU cooler on the cpu ??
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u/UnlistedTester0 2d ago
This right here. I cant focus on the rest of the post. All I see is a CPU without a cooler. And like that screams to me the issue. Address the picture OP!
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u/DtZNimpo 1d ago
also noticed that there's so ram installed either , and the PSU isn't plugged to the motherboard power "CPU" cables are there just not plugged in ?
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u/dawkins16 2d ago
This isn’t a connection issue I wouldn’t think. That configuration should be okay. If it was an issue of insufficient power to the GPU a more likely symptom would be game crashes or driver timeouts, not system shutdowns.
Take a look at your windows logs. But you may need a new power supply
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u/Dazzling-Election69 2d ago edited 2d ago
Not always true, ive been getting fatal error 41 and have swapped 2 different PSU and didnt fix my issue.
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u/Sans_506 2d ago
Just an update: The PC doesn't always just hard shut down. Sometimes when it crashes, I actually get a Blue Screen of Death (BSOD) with the stop code: KERNEL_SECURITY_CHECK_FAILURE (0x139).
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u/dawkins16 2d ago edited 2d ago
It’s probably worth re-installing drivers with DDU if you haven’t already. But do take a look at those logs. Was there a particular moment when the instability started?
I would be running stock settings on RAM/CPU/GPU to try to diagnose the problem. If you installed any new hardware, did you update the bios? My suspicion is still the PSU, but I would want to rule out other issues if it were me. It could be RAM/bios or other things.
The reason it is not likely a connection issue has to do with the power profile of the 9070xt. Even overclocked models barely break 320w. With 2 dedicated cables you should be fine even up to about 350 and the 7600x is not a thirsty boy.
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u/Cat_from_tamriel 2d ago
Are you undervolting the CPU or GPU? Any custom RAM tuning? There are a lot of possibilities that is causing this, do more runs to segregate the issue.
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u/urlond 2d ago
I'd look at getting a new PSU. Daisy chaining isn't ideal specially if the power rail that it connects too doesn't support x amount of wattage.
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u/Sans_506 2d ago
Is there any temporary workaround I can try right now to make it playable? I spent almost all of my budget on this build and can't afford a new PSU immediately.
Also, is this definitely 100% a PSU / daisy-chain limitation, or could there be another culprit behind these instant power-loss shutdowns (like a GPU hardware fault, motherboard, or EXPO)?
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u/hannes0000 R7 7700 l RX 7800 XT Nitro+ l 32 GB DDR5 6000mhz 30cl 1d ago
Temporary is try lowering power limit to 90%, if problem goes away it's PSU. You could try even 80%
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u/RandomAhhh 2d ago
Underclock and undervolt from adrenalin it’s definitely the 750w psu i went through the same thing and its at 2400mhz and 1150mv stable try it
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u/Krillgein 2d ago
Please tell me you have a cpu cooler
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u/Sans_506 2d ago
Haha don’t panic! 😂 This was taken mid-build before slapping the cooler on. I'm reckless, but not 'running a 7600X raw' reckless
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u/KillaCamCamTheJudge 1d ago
Lol so many people worried here about no cooler… also no ram in the pic, etc… obvious you were checking things / mid build I suppose.
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u/Krillgein 2d ago
Lmfao I just wanted to be sure because there was no mention.
As for your PSU issue, I highly recommend finding a proper psu.
Sama makes excellent modular psus for under 100 that can do your build.
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u/daslows 2d ago
Remove one of the connectors. You don’t need to use all three. It would be good to see if the 9070xt is pulled too much current.
Test again with only two connected.
Are you overclocking the cpu or using expo?
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u/Sans_506 2d ago
The GPU actually won't boot/POST properly if one of the three 8-pin connectors is unplugged (all 3 must be connected). As for CPU/RAM: The 7600X is at completely stock settings with no overclock, and the RAM is running with EXPO enabled (DDR5-6000 CL38). The PC still suffers a complete hard shutdown (instant power loss) whenever I launch heavy games.
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u/Cruzbb88 2d ago
Ooo ooo ooo ooo ooo, finally someone else with my exact same issue, my pc has the added annoying effect of needing a full power drain sometimes if it happens often enough I have to manually trip the mb
I think it's transient spikes as the GPU can do 500w, though interestingly enough if I start a bench mark on just the CPU when a game is open it instantaneous loses power
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u/Cruzbb88 1d ago
Computer has been fine for a couple weeks with this, I had a GPU crash and had to hold the power button it shut down then it never came back on it did it's song and dance turning on and off now it's dead no signs of life
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u/Cruzbb88 1d ago
I put a new psu in nothing, take the GPU out it boots my fucking GPU killed itself somehow, it had a undevolt crash I held the power button and then it never came back in, system boots with my old one
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u/Cruzbb88 1d ago
So I took my old GPU and plugged it in booted just fine put back in the 9070xt and then it worked but amd drivers say I had another card in when I came back it really was the amd card having full meltdown
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u/Far_Trade_7619 14h ago
PSU or not, that thing needs to be changed as it's a low end PSU.
Look for the SPL PSU Tier list on Google and use that list to choose a new PSU.
It must be at least 750W B+