empleat Posted January 7, 2021 Share Posted January 7, 2021 Not entirely sure. I have RM650x (2018). There is no manual! And markings on the PSU are confusing! I am sure I connected PCI-E cables to a GPU and CPU cables to a CPU. What I not sure of: maybe I connected one PCI-E cable into the CPU slot on the PSU! And a CPU cable into the PCI-E slot. I have consistently, over multiple windows installs, issue with Nvidia control panel disappearing! And Nvidia support said, it could be: because driver is crashing! So I did Firestrike and I got results: PCI-E rails are undervolted under 11.72v. And some problem that GPU is maybe not taking 75W from motherboard first, I don't understand it. Could this be caused by cable connected in opposite? Before I connected cables to the PSU, I was wondering same thing - which goes where... And video I watched just now, seems familiar. I probably got it right. Just to recap: I have this one: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRsJXH1H6tb62_NkOjQwpfF3nOzP_ZyltFUdA&usqp=CAU Also if it is hard to see you can watch this video: [ame] [/ame] 3 slots in the bottom right above white text which says: 6+2 PCIe & 4+4 CPU. I think: I put PCI-E cables into 2 slots from the left. Is this correct? Before I rebuild my whole PC again to test this, or RMA. Thank you very much! Link to comment Share on other sites More sharing options...
Corsair Employees Corsair Notepad Posted January 7, 2021 Corsair Employees Share Posted January 7, 2021 On the PSU end the 8pin connections that are labeled CPU & PCIe accept both the PCIe and EPS12V power cables. Its the hardware end, motherboard or GPU, where the difference occurs. Link to comment Share on other sites More sharing options...
empleat Posted January 7, 2021 Author Share Posted January 7, 2021 On the PSU end the 8pin connections that are labeled CPU & PCIe accept both the PCIe and EPS12V power cables. Its the hardware end, motherboard or GPU, where the difference occurs. Hah, so i still need RMA :(: Thanks for the answer! Not sure why CPU and PCI-E slots are marked differently on PSUs, if it doesn't matter?! Link to comment Share on other sites More sharing options...
Corsair Employees Corsair Notepad Posted January 7, 2021 Corsair Employees Share Posted January 7, 2021 Hah, so i still need RMA :(: Thanks for the answer! Not sure why CPU and PCI-E slots are marked differently on PSUs, if it doesn't matter?! They aren't marked differently. The marking is clearly indicated that the 8-pin connectors on the PSU end is for your PCIe and EPS12V (CPU Power) cables. Link to comment Share on other sites More sharing options...
empleat Posted January 7, 2021 Author Share Posted January 7, 2021 They aren't marked differently. The marking is clearly indicated that the 8-pin connectors on the PSU end is for your PCIe and EPS12V (CPU Power) cables. Yeah that's one way to look at it. I thought I had PSU, which had marked one for CPU specifically, or it was in manual perhaps. And not like 3 grouped at one place. Also holes for PCI-E were green, so the cables. While CPU slot was not! So this was confusing! As there is no explanation in manual... Link to comment Share on other sites More sharing options...
LeDoyen Posted January 8, 2021 Share Posted January 8, 2021 can you list what's in your build ? and are you using extensions on your PCIE cables? 11.74v is still in spec, but maybe it dips further if the PSU is overloaded, or if there's extensions generating more resistance Link to comment Share on other sites More sharing options...
empleat Posted January 8, 2021 Author Share Posted January 8, 2021 (edited) can you list what's in your build ? and are you using extensions on your PCIE cables? 11.74v is still in spec, but maybe it dips further if the PSU is overloaded, or if there's extensions generating more resistance ASUS Z390-i gaming Intel i5 9600KF GeForce® RTX 2070 SUPER™ WINDFORCE OC 3X 8G I think this is my ram, if not have generic not for AMD - F4-3200C16D-16GTZR Corsair RM650x (2018) I was using PCI-E vertical mount for GPU and had voltage drops under 11.72 on PCI-E rails. But i tried on old motherboard GigaByte b75m-d2v and I didn't notice dips in HWINFO under 11.72, but I can't read raw log! So I am not sure about that and support didn't answer to this straight. He only said something (like another issue) that 75W from motherboard should be drawn first and didn't explain why... I can link that: https://www.nvidia.com/en-us/geforce/forums/notifications/topic/200450/ UPDATE: it is probably PSU, as pci-e port on different motherboard (using same PSU) is undervolted. Not likely 2 mobos would have same problem! Edited January 8, 2021 by empleat Link to comment Share on other sites More sharing options...
LeDoyen Posted January 8, 2021 Share Posted January 8, 2021 under full load, i never see the PCIE drawing much power. it's always in the 45 - 55W tops. most of the power comes from the PCIE cables. Remember voltage measurement on PC is dodgy at best. if all your readouts on GPU and motherboard are that low, yea you may have a PSU issue. If it's just one reading (GPU PCIE input voltage) that is low, well you have the same readout issue on 2 motherboards ^^' all the 12V supplies are common at the PSU end. There's only one big 12V output that feeds all.. motherboard +12v, EPS 12V, PCIE, SATA, etc... A good test of your PSU would be to load it like a savage, like. i usually run valley or superposition benchmarks + cinebench looped if the CPU is having it too easy.. and look if ALL the 12v readings dip a lot. if they do, your PSU may be having a hard time coping. But with your build, i very much doubt it, even overclocked. Link to comment Share on other sites More sharing options...
empleat Posted January 8, 2021 Author Share Posted January 8, 2021 under full load, i never see the PCIE drawing much power. it's always in the 45 - 55W tops. most of the power comes from the PCIE cables. Remember voltage measurement on PC is dodgy at best. if all your readouts on GPU and motherboard are that low, yea you may have a PSU issue. If it's just one reading (GPU PCIE input voltage) that is low, well you have the same readout issue on 2 motherboards ^^' all the 12V supplies are common at the PSU end. There's only one big 12V output that feeds all.. motherboard +12v, EPS 12V, PCIE, SATA, etc... A good test of your PSU would be to load it like a savage, like. i usually run valley or superposition benchmarks + cinebench looped if the CPU is having it too easy.. and look if ALL the 12v readings dip a lot. if they do, your PSU may be having a hard time coping. But with your build, i very much doubt it, even overclocked. Yeah at this point: it will be safest to RMA both PSU and GPU. I doesn't matter much anyways... If I already go there. I wanted to exclude GPU, but I don't have how. I don't know, if in this specific case, it can be GPUs fault too. But better safe then sorry. I don't want to wait 60 days total, if first RMA shows, it wasn't caused by that. Link to comment Share on other sites More sharing options...
LeDoyen Posted January 8, 2021 Share Posted January 8, 2021 it can be the GPU too yes, and i personally bet it is :p PSU problems are usually very obvious and can't be mistaken.. not just a simple game crash. there are exceptions, but... rare Link to comment Share on other sites More sharing options...
empleat Posted January 9, 2021 Author Share Posted January 9, 2021 it can be the GPU too yes, and i personally bet it is :p PSU problems are usually very obvious and can't be mistaken.. not just a simple game crash. there are exceptions, but... rare Nvidia guy bet on PSU :D: Yeah it will be safer to RMA both. THanks for help! Link to comment Share on other sites More sharing options...
Pocah Posted January 9, 2021 Share Posted January 9, 2021 Have you switched off all overclocking? Including the fact that many Asus Z390 motherboards by default overclock the CPU by switching all cores to maximum. Even selecting XMP is overclocking the motherboard. Link to comment Share on other sites More sharing options...
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