ShaggySummers

Well seems like you instantly hit the target. Lowering GPU clock seems to stabilize the system. Currently It seems 1490Mhz is stable; about 100Mhz below what would be normal. I only bought this card 18 months ago so it should still be covered and I'll return it. Thanks a lot WereCatf

Reseated and tested RAM this weekend as well. Only thing I haven't tested for is a faulty ram-slot... is that something that can happen? Windows Event Viewer seems to only register that the system was rebooted unforseen, after it happened. Exchanging parts would be my last resort as this machine will probably not survive this fall. I preordered an HP Reverb G2 and might build a new system around graphics cards that come out this year... depending on the i7 performance then.... Currently still flying to see if the system still crashes after gpu downlock as suggested by @WereCatf. So far 15 minutes in the air and still going strong....

Switched PCIe port just this weekend Thanks for the suggestion though. Hmm Afterburner will only allow me to go Core 1590mhz -> 852mhz Memory 800mhz -> 700mhz But I might as well try it. Running it now.

Would assume it would have crashed on Furmark then? But sure, will try Any idea how hard to drop them? Usually don't tinker with my clocks.

(please excuse any bad English, not my first language) Base information as requested by sticky: Desktop OS - Windows 10 x64 OEM version bought from ebay System is about 4(?) years old with GPU and PSU being about 1.5years old CPU: i7 7700k not OC GPU: Sapphire Radeon RX Vega 56 Pulse RAM: 2*8GB Corsair 3000Mhz + 2*8GB GSkill 3200Mhz (both dual channeling at currently 3.000mhz obv.) MoBo: Asrock z270 Extreme4 PSU: BeQuiet Straight Power 11 550W Drivers up to date / BIOS is current Problem For over a year my system started randomly turning off when under heavy load from gaming. (Destiny 2, maxFPS competitive Games, currently FlightSim 2020) No bluescreen, just a little click from the PSU and the machine reboots. Windows Eventlog seems empty, just registers the boot. Currently Flightsim runs for about 5-15 minutes. Limiting games to lower load seems to prevent this (for example playing Counterstrike at 60fps) however running these kinds of low impact 3D games unlocked will crash the pc after some time. I assume this must be a hardware defect. Troubleshooting so far CPU load: running CPU at 100% load brings it to ~90°C (194F) but it's 100% stable. (Furmark CPU / Prime95) GPU load: running GPU at 100% load brings it to ~70°C (158F) but it's 100% stable. (Furmark) Running both these benchmarks at the same time does not crash the system. RAM: Just bought 2 more ram sticks to check whether my old ones are broken; problem occurs on both sets run separately. Driver and Bios Updates; I think I might even have reinstalled Windows at some point. I was hoping maybe someone had another idea what to test. I don't really want to order a new board for a 7700k this far in and it seems the PSU should not be the issue as it's clearly able to feed cpu + gpu even under 100% load. So I'm kind of running out of ideas here.... If somebody cares I also pulled 2 logs form hwinfo64 One tab is a ~45min 100% CPU Benchmark with GPU joining in after a few minutes. The other tab is regular session of FlightSim2020 crashing after 10 minutes. https://docs.google.com/spreadsheets/d/1fRVtLsJtAI3x6Yq_UOsAE3-nx1Kd2v9rOL2Gck6u6e4/edit?usp=sharing Please let me know If I forgot any important information. Help would be greatly appreciated. Hope you're all having a nice day