help with potential ram problem on new system

danlightbulb

danlightbulb

danlightbulb

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Hi all

I have been experiencing a screen glitching problem which i think i have narrowed down to the setting of the xmp profile of the ram in the bios.

If i keep the ram at 2133 mhz speed using the default profile i dont get the issue, but if i enable xmp profile i do.

The ram is the corsair vengeance lpx 2x8gb 3200 mhz.
The motherboard is the gigabyte z170 k3.
The cpu is an i5-6600k.

I was advised to run memtest which i did and got no errors.

I was also advised to input the ram settings manually. However i have an issue doing this because the motherboard only increments the dram voltage in 0.02v steps. Thus i cannot input the 1.35v that is the rated ram voltage for 3200 mhz.

I wonder if this is the crux of the issue, that the xmp profile is trying to load 1.35v but the motherboard doesnt allow that as a value.

OCUK have said they will generate an RMA for the ram, but i dont know if this is the issue.

There are motherboard bios updates available which cite xmp compatibility, the latest one being in beta. Im not sure if i should try this first, although reflashing the bios is a risk and i dont know if it will solve the inability to enter the voltage manually at 1.35v because of the step that is allowed.

Would appreciate some help.

Thanks
 
Ok so ok to go for a beta bios?

It is odd that the rated speed is 1.35v yet i can only go up in 0.02v steps. 1.34v or 1.36v are my choices at the moment, but i wonder if the xmp profile is leaving the ram at 1.2v default because 1.35v doesnt exist as an option.

Is it feasible that the bios update would change it so 0.01v steps were allowed? Is that the kind of change bios updates make?
 
Should i test it with the ram settings except for voltage first, so wiyh the 32x multiplier, the correct latency value but leaving the default 1.20v dram voltage?
 
Something odd is going on here.

I logged in to the PC to read this latest reply, and then proceeded to restart it in order to apply the settings. However the motherboard lights went off and the pc went dead. I had to switch the power off at the PSU and restart it, at which point I got a BIOS boot error and had to load optimised defaults to restart.

I had not changed any of the settings yet!



Update - the 3000MHz settings with the 1.36V have worked for now - I'm in the PC and doing the same things that caused the glitches before and none are appeared yet.

Update 2. Im now in the pc at 3200 mhz and im not sure. I just got 1 screen glitch but its not happened again.

Update 3. Im getting the glitch at this speed now. It happens once every few minutes - only if the system is under a little load though.


Final update. I have dialled the RAM back to 3000MHz @ 1.36V, and also applied my CPU overclock on top which is 4.4GHz @ 1.23V. At the moment (touch wood), I have got no glitching. I think I'll leave it there for a few days now and see what happens.
 
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Something is definitely not right.

I haven't changed any more settings yet when I switched the PC on for the first time tonight, it appeared to restart itself during POST, and then came up with this:

10nal4m.jpg


But I loaded in my saved profile (4.4GHz CPU, 3000MHz ram), and it rebooted fine and now its working.


I ran the Intel benchmark and it completed fine (score 1105 marks). The Realbench benchmark also completes with no errors or problems with a score around 120,000.


Its passed the intel stress test too for both CPU and RAM.
 
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The guy a few posts above said the motherboard voltage needs to be increased, it could be the same for you?

I don't know what setting this is though in the BIOS - if someone can chime in would be appreciated.
 
What was it before?

I dont know about mine. There is a voltage displayed in the BIOS which is 0.960v but the bios is in auto mode so i have no idea what its actually running at. The bios tells me several real time voltages, but it appears not that one.

I have also tried several windows hardware monitors and none of them seem to show the VCCIO or VCCSA voltages.



Edit 22:07
I have set my VCCIO at 1.15V, ram at 3200MHz and ran a stress test - passed no issues. No sign (yet) of the screen glitch I was having.

Naster - from reading around I think 1.28V may be a tad high - have you tried yours lower?


I have also found that the BIOS is in auto mode for system agent voltage, and BIOS reports this is running at 1.3v which is the maximum allowed setting in the BIOS. I wonder if there is any merit in lowering this, perhaps to 1.25V?



Temperatures during the CPU and ram stress tests were just over 60 degrees. Running the RAM at 3000/3200 MHz has added 10 degrees easily to what the CPU overclock added.


I have noticed that my CPU fan is increasing speed as one would expect, but the two case fans are not - they are remaining static at mid 800's RPM.
 
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Thanks Besty and Nasher for the help in this thread.

Raising the VCCIO voltage in the BIOS has stabilised my system, no glitching whatsoever (touch wood), and no boot failures (touch wood again).
 
It would be good to get confirmation that these ram and voltage settings are safe for the long term.

My vccio is set at 1.16v and vccsa at 1.25v.

Dram voltage is 1.36v with timings set as per ram rating.

Cpu core is 1.24v running at 4.4ghz.
 
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