What motherboard? The 5900x and 5950x are pretty power hungry CPUs and low end boards might not play well with them.
this post was submitted on 17 Jul 2026
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Tuf b550-m (no Wi-Fi), not low end, but certainly not top tier
Is this the board? The VRM situation looks pretty dire, but I wouldn't think that'd be an actual problem. Also why do you have C states disabled? That's not going to be helping your VRM situation.
Also what does your CPU cooling situation look like? Do you have a tower cooler that blows air over the VRM, or water cooling that leaves the VRM baking? Also generally for best performance you'd want xmp/docp/whatever the other thing is turned on. It's free performance if your RAM supports it.
Yep, that's the mobo. C states disabled as that was the advice given on arch forums. Apparently dialing c states is supposed to prevent the os from going into low power mode then crashing when voltage sags.
Cooler is noctua nhd15 with ptm7950, never been above 75c even in stress tests. Second fan on the cooler is as low as possible to blow over the vrm heat sync close to rear i/o.
Literally all of the advice for crashes says to disable xmp/docp. At the moment performance isn't the concern, it's the crashes
This is what comes to mind for things to check:
- Check your cables. Make sure none of them are loose, damaged, or obstructing fans
- Make sure your RAM is seated properly, your GPU isn't sagging, the heatsink is properly attached to your CPU, etc.
- Watch the thermals and physically check to make sure that your fans are actually spinning when they should be
- Disconnect the GPU and see if it still fails
- Run a memtest
- Try a different kernel (newer is usually but not always better...)
Good luck. Hope you can get the gremlins worked out soon!
Your PSU is too weak.
Really? 1000w isn't enough? GPU+cpu combined shouldn't use more than 450 at full load, so I should have plenty of room for transient spikes.
If I really don't have enough now how much is enough?
Is it the 7900 xt or the 9070 xt? 7900 xt does have a beefy power draw. But AMD's "Minimum PSU Recommendation" is 750W so 1000 should be plenty.
And the 9070 xt uses less than that.
9070xt for sure. Only has 16gb vram
Yes, your combined wattage use at peak is up to 1250, so you need to downclock, or buy a powerhouse PSU.
Your error literally says devices dropped offline. How would you imagine that happens aside from power drops?
Your error literally says devices dropped offline.
That's definitely not the wording in the error, so I didn't realize that's what it meant. Is there anywhere you'd recommend I read up on mc5 errors?
Mc5 hardware error
Dafuq you think that is, son?
*Edit: post logs, ya baby ass bitch
why the fuck would i ask if i already knew?
[Hardware Error]: System Fatal error.
[Hardware Error]: CPU:12 (19:21:2) MC5_STATUS[-|UE|MiscV|AddrV|PCC|TCC|SyndV|-|-|-]: 0xbea00000>
[Hardware Error]: Error Addr: 0x00007fb9e0b2ab0c
[Hardware Error]: IPID: 0x000500b000000000, Syndrome: 0x000000004d000000
[Hardware Error]: Execution Unit Ext. Error Code: 0
[Hardware Error]: cache level: RESV, tx: GEN, mem-tx: GEN
[Hardware Error]: System Fatal error.
[Hardware Error]: CPU:3 (19:21:2) MC5_STATUS[-|UE|MiscV|AddrV|PCC|TCC|SyndV|-|-|-]: 0xbea000000>
[Hardware Error]: Error Addr: 0x01ffffffc0a06ae4
[Hardware Error]: IPID: 0x000500b000000000, Syndrome: 0x000000004d000000
[Hardware Error]: Execution Unit Ext. Error Code: 0
[Hardware Error]: cache level: RESV, tx: GEN, mem-tx: GEN
[Hardware Error]: System Fatal error.
[Hardware Error]: CPU:24 (19:21:2) MC5_STATUS[-|UE|MiscV|AddrV|PCC|TCC|SyndV|-|-|-]: 0xbea00000>
[Hardware Error]: Error Addr: 0x01ffffffb895f8b4
[Hardware Error]: IPID: 0x000500b000000000, Syndrome: 0x000000004d000000
[Hardware Error]: Execution Unit Ext. Error Code: 0
[Hardware Error]: cache level: RESV, tx: GEN, mem-tx: GEN