MBP reboots after changing RAM, but only with WoW ...

Dear all,

my Apple Care (3-year) expired just a couple of months ago and so I decided to upgrade my RAM memory on my MacBook PRO, 2.67 GHz Intel Core 2 Duo, mid-2009, nVIDIA 9400/9600 256MB.
It originally shipped with 4GB (2x2) DDR3 SODIMM 1067 MHz which, as I opened, noticed being labeled "Hynix - KOREA".
As that frequency was not anymore available at the retailer I purchased 2x4GB of Kingston DDR3 SODIMM 1333 MHz CL9.
The installation went perfectly and the system reacted very smoothly, also recognizing them as 1333 MHz ones.

All the applications - I had at the time OS X 10.7.5 - ran perfectly and with much more swiftness as intended but ... one didn't want to collaborate: World of Warcraft. I am using my Mac for work so the functioning of that software is not vital for me, but I would like to investigate anyway.

In the first 60 mins of play the computer freezed once completely and then just WoW blocked, obliging me to a Forced Quit.

Then, two days ago, I decided, due to my now 8GB of RAM, to upgrade to Mountain Lion. The process went on perfectly and the system responded great, but now, WoW caused the system to reboot continuously. If I do not use WoW everything seems to be fine, but I would like to know if there is some connection between the following points:

1) WoW and Mountain Lion
2) the RAM I installed and WoW on Mac
3) the upgrade to ML on a 3-year-old machine.

Here is what I have already done to try to fix:
1) disk and permission repair, PRAM and NVRAM reset.
2) reinstall WoW from scratch and run it in both 32 and 64-bit mode,
3) run WoW with no addon at all.

All with the same result.

As far as I know, Hynix RAM is the same mounted on low-end notebooks and it is not at all worthy 200€ / 4GB. But I could be wrong ...
Is this a "special version" of that? Is there something wrong with my Kingston (which, on macupgrades.co.uk was given as fine?)
There is also a thread here in the support that made me see that Kingston was fine also with another frequency.

I repeat myself, the machine runs perfectly ... just WoW has this annoying problem.
I am also waiting for an answer from battle.net assistance, but if anybody of you has some tips I would be incredible thankful to all of you.

Also I am kind of skilled with the OS so I could easily reinstall everything from scratch (i.e. Leopard, then SL, then directly ML) and try again to fix it, but I would really like to know before the source of the problem before doing something so long.

Thanks to all

Sincerely

Michele Galvagno

Thanks for your advice.
I have actually run the test of TechTool PRO 6 and it says my system is perfectly working.

Also, the problem I encounter with WoW is solely with it: all the rest works perfectly, but I have to admit that the problems started with the installation of the new RAM.
Could it be that this Kingston makes everything but WoW work perfectly?
Because sometimes WoW just blocks, some others computer reboots on its own and says "panic report".
I repeat myself, just WoW causes problems and, actually, it could be the video card which is a bit outdated ... But it was working before changing the Ram ... Argh!

I would still like to upgrade my RAM memory, but at Apple it is 400€ for 8 GB ... That is the actual valor of the whole machine ...

Yeah.. As WoW started to crash just after installing the new RAM I suspected that could have been the problem.
Now AHT is running the extended check and I'll keep you up to date about that.
If the same problem persists I will remove and reistall the RAM to be sure that it is fixed and then maybe buy from crucial where it seems to be certified... Would it be good?

Thanks...

Ok, Apple Hardware Test gave this error:

4MEM/4/40000000: 0xa9d2e718

Now, as suggested, it is running the second passage.
Thanks for your help.

Ok ... I restored in place the old RAM and, even with 10.8.2, it works perfectly fine.

So, on crucial I can find the RAM which should fit but my friend (who is the reseller) says that the quality of Crucial's RAM is not even comparable to the one of Kingston ... Also, Corsair, where can I find the perfect model which works?

Thanks