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Very strange error behavior - Motherboard/PCI-E Lanes broken?

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Everything started with the following symptoms after I installed my new GTX 680 (I'll post full system specs at the bottom):

Random BSODs while gaming, games crashing with various error messages. The frequency of BSODs and crashes varied a lot, sometimes multiple on one day, sometimes a week or more between them.

The BSODs had the following bug check codes:
- 0x1A (MEMORY_MANAGEMENT)
- 0xC2 (BAD_POOL_CALLER)
- 0x10E (VIDEO_MEMORY_MANAGEMENT_INTERNAL)
- 0xC1 (SPECIAL_POOL_DETECTED_MEMORY_CORRUPTION)
- 0x19 (BAD_POOL_HEADER)
- 0x7E (SYSTEM_THREAD_EXCEPTION_NOT_HANDLED)
- 0x119 (VIDEO_SCHEDULER_INTERNAL_ERROR)

So I started testing everything I could think of:
- Memtest, 5 passes
- 17 hours of Prime95 for some additional CPU & RAM testing
- Furmark, as well as Furmark + Prime95 about an hour each
- 3DMark11 over night
- MemtestG80 (VRAM Memtest from the Folding@Home Site) for ~15 hours

None of this produced any errors, crashes or BSODs. Since I was still having the problems though, and with 1 or 2 exceptions during video playback, all happened while gaming, I figured it's most likely the video card (A MSI Twin Frozr III OC).
So I RMA'd it, and it got sent back to MSI, which took a few weeks.
Meanwhile, I installed my old video carf, a GTX 460, and all problems went away, so I was fairly certain that it must have been the card.
Well, until I heard from MSI, saying that there is nothing wrong with the card and that I'd get it back.

Since I wasn't really buying that as everything was working with my old card, I decided to try out another card, a GTX 680 DCUII TOP from Asus, and suddenly all the same problems appeared again.

There was one difference remaining between the old card and the new card, which was PCI-E 3.0 vs PCI-E 2.0, so I forced the Asus card down to 2.0 via the BIOS, but the problems persisted.

Now I can't really think of much other than PSU or MB. The problem I have with the PSU is that I didn't manage to reproduce any errors under maximum system load, so surely it can deliver enough power to the components. I also checked voltage stability on various load levels with OCCT, and it looked quite stable.

The problem I have with the MB is that everything was the same, except I changed the video card, but it's not the video card. I'm not sure how the PCI-E slot/lanes/?? might be broken, but no problems occur when a GTX 460 is placed in there. (Also I can't say that I'm very thrilled at the thought of replacing the MB...)

My system is:
- Asus P8Z77-V Pro
- Core i7 3770K
- Corsair 16GB DDR-1600
- Creative X-fi Platinum
- Asus GTX 680 DirectCU II TOP
- Samsung 830 SSD, 256 GB
- Seagate Barracuda Green 5900 RPM 2 TB
- PSU: Enermax Platimax 600 W

I can rule out overheating since my system has a very good airflow and I never measured any overly high temperatures.

I can also pretty much rule out software problems: I have reinstalled the Nvidia drivers countless times, including using things like safe mode, driver sweeper and whatnot.
I also re-formated and did a completely fresh Windows installation, only installed drivers and the progrems that I absolutely need for a while, and still had the same problems. I also ran file system checks and system file checker repeatedly, installed all drivers in their newest versions, and upgradey my BIOS to the latest release (which is from about 2 weeks ago).



Well, I am thankful if anyone has any more insight into this, and thank you for reading!

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