[SOLVED] System freeze while idle mostly ASRock 970 Pro3 r2.0

Feb 11, 2019
Hello. I have recently serious problems with a PC. I had randomly black screen system crashing with GPU fans spinning at 100%. After I fixed it by changing slot in modular PSU to another slot(there were 2), it never made fans go 100% after such crash. No logs for a blue screens or something like memory.dmp. Since I am expieriencing problems with my PC for a month and still I have no idea what can cause the problems I bought some new hardware pieces and still have the issue.
My build is:
Motherboard: ASRock 970 Pro3 r2.0
CPU: FX8350(never overclocked and it's not overheating issue either)
RAM: 10GB (2x4GB and 2 GB)
HDD: some WD 1 TB HDD and now added 512GB SSD(during the issue both were a system disks and problem occured on both, so it's not HDD that sucks)
GPU: HD6850 upgraded to RX570(my friend was testing the HD6850 for a week without a problems)
PSU: Some modular Corsair 550W replaced by SilentumPC 600W

I just reinstalled system yesterday(Windows 7 before and after 64bit ofc), I installed only neccessary drivers + most of the Windows updates(SP1 + frameworks securities etc.). Today system went idle when I was afk it got frozen again. I changed the power settings in windows so now my screen will never go off, and so HDD won't go off either. I will report if that kinda solved the problem or not, but like month ago and earlier that wasn't and issue so I would rather try to fix the issue than find a way for workaround it. Is that motherboard damaged or maybe some bios settings messed up? I have a cheap Gigabyte mobo that doesn't have FX8350 on the support list(but on some website people reported that they are both working together). I could try use it and see if the problem occurs there.

I believe the problem is with motherboard, or the bios settings(after all these upgrades I have done so far).
10GB (2x4GB and 2 GB)

Memory is guaranteed in the form sold. I suggest using a kit of two 1866MHz modules. You also need to set memory clock speed, DRAM timings, and DRAM voltage.

Don't expect use of random memory modules to be compatible or leaving memory BIOS settings on [Auto] to give respectable performance.
Reactions: niszczyciel502


Nov 29, 2015
Yeah, first thing that came to mind when reading this was possible memory issue, then I saw 10GB RAM with mismatched RAM modules. Can't do that. Get the 2GB stick out of there, make sure the 2 x 4GB sticks are in the correct 2 slots on your mobo (per its manual) and see if things stabilize.
Feb 11, 2019
Thanks for your replies. I posted on tomshardware.co.uk but it somehow create post here... and I didn't get any replies there and I got them here and then I realized it's ".com". Back to the topic.
The system in that state with 10GB RAM was working without any problems for over a year. RAM modules are:
Manufacturer (ID) Samsung
Size 4096 MBytes
Max bandwidth PC3-12800 (800 MHz)
Part number M378B5173QH0-CK0
Serial number 168E9A6A
Manufacturing date Week 23/Year 14

JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-16-22 @ 457 MHz
JEDEC #2 7.0-7-7-19-26 @ 533 MHz
JEDEC #3 8.0-8-8-22-30 @ 609 MHz
JEDEC #4 9.0-9-9-24-33 @ 685 MHz
JEDEC #5 10.0-10-10-27-37 @ 761 MHz
JEDEC #6 11.0-11-11-28-39 @ 800 MHz


Manufacturer (ID) (7F7F7F7F7F7F7F5D000000) - Stands for a GoodRam I guess
Size 2048 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number GR1600D364L11/2G
Manufacturing date Week 24/Year 13

JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-17-23 @ 457 MHz
JEDEC #2 7.0-7-7-20-27 @ 533 MHz
JEDEC #3 8.0-8-8-22-30 @ 609 MHz
JEDEC #4 9.0-9-9-24-33 @ 666 MHz
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 9.0-9-9-23-31-2T @ 654 MHz (1.500 Volts)
XMP #2 11.0-11-11-28-37-2T @ 800 MHz (1.500 Volts)

I changed it to manual DDR3-1600 and used Timings for JEDEC #6 in these Samsung sticks. However in BIOS they are present as a JEDEC#1. There were few things where I left it on auto. So far so good. I changed the power saving settings in windows power management to screen going off after 1 minute and hdd go off after 5. PC was functional even after 30 minutes of being on idle. I am not sure if my problem is definitely solved. I will eventually report if still something bad is going on. If it will freeze again I will remove that 2GB piece. Samsung sticks are at banks A1 and B1 which in CPU-Z are slot 1 and 2 and its 1st and 3rd slot on MB if looking from processor side.
Feb 11, 2019
So... Hello after long time. My issue was far from being solved sadly. Firstly I diagnosed correctly that PSU from Corsair is at fault. PC was crashing at random times even at that asrock bios screen. However after getting new one combined with ssd, new gpu... Installing new Windows something strange happened. Freezing when idle. I tried setting these timings for 1333 MHz and 1600 MHz. No luck. I removed the 2 gb stick(even as system was working fine for over a year in such config). I found on other forums that for some user defrag process running in background when idle made PC freeze when it reach certain directory. I checked if this is issue for me. Firstly I noticed that Windows made defrag only for d and e partitions of 1tb hdd. But c was never touched. I made defrag c manually. It didnt freeze. I run now PC for few hours and it didnt freeze. It was the fresh Windows install issue not the ram. I would never tell it can be Windows. Windows that was just installed(or some update I have installed shortly after).

In short words solution was to do defragmentation of C. Not the RAM as anyone would thought of.