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i7 3930K RAM Limitations & Issues

post #1 of 15
Thread Starter 
For those upgrading or building a new system with the i7 3930K Intel CPU please be aware
of the following information.

On Dec 5th I purchased a new i7 3930K CPU and an Intel DXX79TO Motherboard.
Assembled everything on Friday and installed Windows 7 64Bit Pro.

Everything went smoothly up to that point, then over the weekend I began to experience
intermittent freeze ups, the mouse would lock in place and the system would not
respond short of a hard power reboot.

I had installed a G.Skill RipJaws 16GB 4x4 ram kit running at 2133Mhz.

The CPU is water cooled and the temps are very good so no issues there.

After a frustrating weekend I contacted Intel support this morning, Monday Dec 11th.
Intel informed me that the i7 3930K CPU had compatibility issues with my ram because
it only supported ram running at 1600MHz !?

I found it odd that a high end CPU such as this was limited to a base 1600Mhz ram clock.

I went back to the computer store this morning and exchanged my ram for a
Patriot 4x4 1600Mhz 16GB kit, as of 10 minutes ago this ram is now in my system
and hopefully my freeze ups are a thing of the past.

The Motherboard BIOS was also upgraded over the weekend but I was still
experiencing freezing even with the BIOS update.

Apparently it's not a motherboard issue, this motherboard can support 2400Mhz
ram it's the CPU that does not support speeds above 1600Mhz.

So if you are planning on using the i7 3930K CPU be aware that it will,
according to Intel, only operate correctly with ram running at a 'NATIVE'
clock speed of 1600Mhz!

I usually leave my computer running 24/7 and only reboot for updates or when
new software installations require a reboot.

I am monitoring the system carefully now, I hope that this has resolved my
issue. Intel informs me that I am not the only person who has experienced
this issue with freeze ups when it comes to this CPU. I am aware of this as well
based on previous forum posts from other owners who have also been
experiencing this issue on other forums.

Just in case, Intel has given me a service tracking number for this issue
and if I have any further problems after the ram swap I can contact them again.

I hope this information is useful to anyone having similar issues.
post #2 of 15
It is a same story like for PCI E 3.0 -> depends of manufacturer and most of anything of patience biggrin.gif
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post #3 of 15
Intel only supports 1600Mhz RAM, but you can still run your RAM at XXXXXMhz. It's been like that for years. This is nothing new, but it's a shame you ran into problems.

It still should work though.
post #4 of 15
All memory speeds in excess of DDR3-1600 are unofficial and unsupported by Intel. This applies to all of their current high end processors. Anything further is OCing. However, official speed ratings and what is actually possible are often very different, hence the existence of enthusiast memory.

Anyway, the LGA-2011 platform is a complex one, and has been slow to mature. To get everything running flawlessly often takes a bit of work, even for systems run within spec.
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post #5 of 15
Thread Starter 
Thank you for your thoughtful responses smile.gif
I am not terribly knowledgeable when it comes to overclocking, hence my presence here smile.gif

But like many of you I am quite power hungry for performance.
post #6 of 15
Thread Starter 
Do these temps look high? I have a closed loop water cooler.

post #7 of 15
The temps look fine. Anything above 1600mhz isn't that much of a performance increase anyway.
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post #8 of 15
Thread Starter 
Quote:
Originally Posted by TKFlight View Post

The temps look fine.

Thank you smile.gif
post #9 of 15
CPU temps are fine, other temps appear to be sensor or software errors. I would double check your board and memory temps just to be safe
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post #10 of 15
Im running 2133 gskill ram w/ 32 gb filling up all 8 ram slots.

You WILL need to mess around with vccsa and vtt voltages, along with ram timings, vccsa load line calibration and ram current limits ( if your motherboard supports these settings ) to get your system stable. Even more so if you are also oc'ing ur CPU. Try not to go over 1.2v for vccsa or vtt, so do not set these settings to AUTO if you are using XMP profiles.

I would start with running the ram through memtest first to see if they are good sticks before moving on.

Also some CPU's just have weak IMC's, but I highly doubt that's the issue here.

Edit: here is a guide written for the r4e mobo's , but it applies to you too

http://rog.asus.com/forum/showthread.php?25510-Rampage-IV-Extreme-RAM-Guide&country=&status
Edited by blue.chord2 - 12/11/12 at 10:40am
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