Shutdowns on Crosshair V Formula Z

[alex_123_fra]

Hi guys,

I am slightly stumped by this fault and wonder if I could pick your brains. I built this system for my son but can't pass it over to him until this is sorted. Specs:

CPU: FX 8320
Mobo: Crosshair V Formula Z BIOS 1602 (the latest one)
RAM: G-Skill Ripjaws Z 1866MHz (16GB 4 x 4 Quad channel kit) but only using 2 x sticks - 8 GB in slots 1 and 3
PSU: Akasa Venompower 750W
GPU: His ICEq Boost 7950
OS: WIn 7 ultimate 64

I installed the OS and all drivers etc and then overclocked the CPU to a modest 4.6GHz @ 1.42V with the RAM at 9-10-9-28 (XMP profile timings). The CPU is watercooled with a custom loop. I ran prime95 for 12 hours with absolutely no issues (max temp 59C).

Now every time I leave the PC, I do a formal shutdown so I never use the sleep function. When I go back to power on, the fans and drives start up and after around 5 seconds it shuts down again before POSTing with no attempt to restart itself. If I clear CMOS, it allows me back into bios and I can then choose my overclocking profile. When I restart, from bios, all is well and back into windows again.

I looked for the motherboard codes when these shutdowns happen and saw that initially it shows "OC" and then "F.F." before shutting down. I thought it might be a RAM issue so loaded up memtest86 from a bootable DVD. When memtest starts the standard test (one stick of RAM in slot 1), it causes the computer to shut down within about 30s. It does this on xmp settings and also on totally "optimised default" settings of 1600MHz at 11-11-11-28.

I am letting it run windows memory diagnostic on each stick individually now and so far on the first stick of RAM, no shutdown but I don't really know where to go next if the windows diagnostic passes? New PSU? Is it the board?

[Muha_Akhusiyya]

Hi Alex,
Try reverting to BIOS 1503 and see what happens.
Wish you success!

[HiVizMan]

Do you have this issue with your system at defaults?

Clear CMOS and run the system to see if the same behaviour occurs please.

[haihane]

hi OP. if i may suggest, try setting the RAM speed, latency, and voltage configuration manually (don't use the XMP profiles stored), then disable the VRM spread spectrum.

coincidentally, i was talking about the same thing here . give it a read, maybe it'll help.

[alex_123_fra]

Thanks guys.

These shutdowns occur whether on default or OC settings.

I have just uploaded bios 1503 and will test tonight to see if that fixes things.

[HiVizMan]

The double post thing when you boot from a power out shut down is normal by the way.

The no post and shut down is not normal of course.

[alex_123_fra]

Well it seems that reverting to bios 1503 has fixed the shutdown issue. I wonder why bios 1602 introduced this problem.

Thanks for the suggestions.

[Muha_Akhusiyya]

BIOS 1602 has been reported by me and haihane to have serious issues with resuming from S3. The issue is probably related to memory--or at least certain types of it--but, according to haihane, has also something to do with the HDD performance.
In any case, ASUS must review and fix this faulty BIOS.

[Nobody-3]

hy
I have the same Problems:
CPU 8350 @ 4000 1,275V
Mobo: Crosshair V Formula Z
RAM G Skill F3-2400C9-4GTXD 2*4GB (runs @ 2133 9.11.10.28 1T)
PSU BeQuiet DarkPowerPro10 750
GPU EVGA 660ti @ Sli
Bios tested vom 16xx - 2002
watercooled with a custom loop
Win 8.1 / 7 64bit ultimate

any ideas?
should i do backflash to 1503 for testing?
currently i do a Clear Cmos and load the optimized bios Settings for testing.
i cant reproduce this effects one ist work another it shut down.

[madcratebuilder]

Welcome to the forum Nobody. It's better to start a new thread with your particular issue.

I would try the mem at 2133/ 9-11-11-31-2T. Fail to POST when OC'ed generally means you have goner to far with the OC. Start with optimized defaults and make small changes.