Possible Faulty RAM / Opinions?

simmons33 · May 28, 2015

System Info

Windows 7 SP1 64bit
Asus Z87 Plus UEFI V2103
I5 - 4670K Stock
GTX 760 Stock
8GB ADATA XPG V2 DDR3 1600Mhz RAM

This all started with a GTA V Crash. GTA V is the most memory intensive application on my system pushing me into 7200/8000MBs memory used. The game ran fine for 220 Hours. Then I got this crash...

Faulting application name: GTA5.exe, version: 1.0.350.1, time stamp: 0x5540c256
Faulting module name: nvwgf2umx.dll, version: 9.18.13.5012, time stamp: 0x55258f68
Exception code: 0xc0000005
Fault offset: 0x00000000006b517f
Faulting process id: 0x1340
Faulting application start time: 0x01d09980ff2f1186
Faulting application path: D:\Steam Games\steamapps\common\Grand Theft Auto V\GTA5.exe
Faulting module path: C:\Windows\system32\nvwgf2umx.dll
Report Id: a940744b-057a-11e5-8535-74d02b2c561c

I also received the exact same Exception Code for the Steam Client webhelper looking at a Wall of GTA Gifs the very same day....

Upon looking up Exception code 0xc0000005, I discovered that this could possibly be faulty RAM and went and created a bootable USB of Memtest86 V6.0.0 .I did think it was a Nvidia Issue until I ran Memtest.

Here are my current results..

2 Sticks @ 1333Mhz / 142 Errors on Test 13 [The Hammer Test] Pass 1
2 Sticks @ 1600Mhz (XMP) / 278 Errors on Test 13 [The Hammer Test] Pass 1

Everything I know about RAM and Memtest suggests to me that this is faulty memory and have already opened a RMA ticket with Adata. The last time I tested my ram around 6 months ago, I passed with flying colors on XMP mode...

I would still like anyone else opinions like always. Thank you

JackNaylorPE · May 28, 2015

I assume those are 2x4GB and you tested at 2 different speeds ?

Worth checking them individually and conforming that its the RAM and not the slot. So far I have never had a bad slot

simmons33 · May 29, 2015

JackNaylorPE :

Yes, those are 2x4GB at two different speeds. Sorry, I forgot to clarify. I will commence the individual testing and post back with the results

Tradesman1 · May 29, 2015

If the errors come in the Hammer test might disregard that, many have had false errors with that test

simmons33 · May 29, 2015

Tradesman1 :

Every error Ive received has been during test 13 , The Hammer Test, so far

This test is new from what I can tell. I only ever recall memtest86 having 10 tests

PassMark · May 29, 2015

Disclaimer: I'm looking after the development and maintenance of MemTest86.

The hammer test errors are real errors. Not false positives. But they are less likely to be provoked by real software compared to other types of RAM errors.

This page has a write up,
http://www.memtest86.com/troubleshooting.htm

This paper has background information about the problem.
https://www.ece.cmu.edu/~safari/pubs/kim-isca14.pdf

And this Google project has more details,
http://googleprojectzero.blogspot.com.au/2015/03/exploiting-dram-rowhammer-bug-to-gain.html

Old versions of MemTest86 didn't have the row hammer test. We were in two minds about adding this new test. As it will surely scare some people without cause. But on the other hand the consequence of a RAM failure can be very serious even if the chance of an occurrence is low. (think banking, medical systems, flight control, etc...).

If your crash is always in the nvwgf2umx DLL (as opposed to being random each time) then you should initially assume it is the nVidia DLL that is buggy and work on fixing that. e.g. device driver update should be the first step.

If you do a Google search there are also 1000s of other people complaining about crashes in this DLL. Many of them playing GTA. So while you do have a (minor) issue with your RAM the balance of probability is that the game provokes a bug in the driver, which then causes a crash.

simmons33 · May 29, 2015

PassMark :

Thank you oh so very much Passmark.

I only just now had access to a secondary computer to do more research. I did find the articles you linked and read them thoroughly. Very, Very interesting. Im going to assume its a game issue. GTA V is not on the shinning pedestal of stability with it comes to a lot of people.

Im currently on the GTAV Game ready driver (350.12) and Im extremely picky when it comes to driver installation and cleaning to avoid potential issues.

The first GTA Crash pointed towards the GTAV.exe
The second towards nvwgf2umx.dll

Nice to know someone from Memtest peruses these forums.

simmons33 · May 29, 2015

I ran MemTest86 for 4 hours excluding the Hammer Test and came back with no errors whatsoever.

As a precautionary measure, I went ahead and reinstalled 350.12 using my own personal method.

Remove GFE, HD Audio, PhysX and Display Driver in that order rebooting when required.

After windows has installed the Generic VGA Driver, Deleting Nvidia and Nvidia Corp folders located in C:\ , Program Files, Program Files X86, Program Data, and Appdata Local

Unplug Ethernet, Disable AV, Install New VGA Driver using custom clean install and rebooting.

On a side note, I checked System32 for nvwgf2umx.dll when the Display Driver was uninstalled and found it absent. So maybe it was corrupted slightly and has been replaced with a new version

Whatever, Unless I start getting Random BSoDs and Driver errors in other programs/games, Im going to chalk this up to GTA V instability.

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Possible Faulty RAM / Opinions?

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