Like the title says when I enable XMP I can no longer boot unless I undo my CPU OC. My RAM is 2 sticks of 8GB ddr3 2133hz and I'm running an i7-4790k on a z97-g45 msi mobo.
Whilst overclocking my CPU I had to do a bios reset and didn't notice my ram had then defaulted to 1333. I managed to get my CPU to a very stable 4.7Ghz with temps <80 and a voltage around 1.275v however when I noticed my RAM was running slow I enabled XMP. This immediately stopped me being able to boot to bios. This also happens if I manually change the frequency to 2133. I checked the base clock of the cpu and it is unchanged by the difference in RAM frequency which I thought could be the problem.
If I run my CPU at stock settings I can run XMP or manually change the frequency fine, so it seems like it's one or the other but I don't see how they should affect each other? Does anyone have any idea's or ran into this sort of problem before? I would quite like to OC my CPU but not at the cost of almost halving my RAM frequency
EDIT: Okay, I've found out if I have xmp enabled or manually enter the xmp settings I cannot increase my core voltage above 1.15v without my system not booting to bios. This is without even trying to overclock the cpu core ratio. Even at 1.15v I am still running into some errors with my motherboard sometimes hanging on 9c or 99 code before booting bios. I know a 9c error is usb and I have checked all my connections to motherboard and they seem fine. I still sometimes still get this error with no usb devices attached also which I believe is strange.
Having the core voltage set to auto cpu-z is only recording a voltage of around 0.95v under an aida64 stress test which I think is pretty unusual as I believed the stock voltage of the 4790k to be around 1.25v. I am now thinking it's possibly a problem with my motherboard or power supply?
oh and I tried chris's advice to increase the ram voltage which did allow me to boot at 1.2v core voltage however about 4 seconds into a stress test my pc died and restarted. Also for reference the xmp voltage for my ram is 1.65v and I increased to 1.70v which I was rather uncomfortable doing as that's pretty high right?
Whilst overclocking my CPU I had to do a bios reset and didn't notice my ram had then defaulted to 1333. I managed to get my CPU to a very stable 4.7Ghz with temps <80 and a voltage around 1.275v however when I noticed my RAM was running slow I enabled XMP. This immediately stopped me being able to boot to bios. This also happens if I manually change the frequency to 2133. I checked the base clock of the cpu and it is unchanged by the difference in RAM frequency which I thought could be the problem.
If I run my CPU at stock settings I can run XMP or manually change the frequency fine, so it seems like it's one or the other but I don't see how they should affect each other? Does anyone have any idea's or ran into this sort of problem before? I would quite like to OC my CPU but not at the cost of almost halving my RAM frequency
EDIT: Okay, I've found out if I have xmp enabled or manually enter the xmp settings I cannot increase my core voltage above 1.15v without my system not booting to bios. This is without even trying to overclock the cpu core ratio. Even at 1.15v I am still running into some errors with my motherboard sometimes hanging on 9c or 99 code before booting bios. I know a 9c error is usb and I have checked all my connections to motherboard and they seem fine. I still sometimes still get this error with no usb devices attached also which I believe is strange.
Having the core voltage set to auto cpu-z is only recording a voltage of around 0.95v under an aida64 stress test which I think is pretty unusual as I believed the stock voltage of the 4790k to be around 1.25v. I am now thinking it's possibly a problem with my motherboard or power supply?
oh and I tried chris's advice to increase the ram voltage which did allow me to boot at 1.2v core voltage however about 4 seconds into a stress test my pc died and restarted. Also for reference the xmp voltage for my ram is 1.65v and I increased to 1.70v which I was rather uncomfortable doing as that's pretty high right?
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