M17x R2, after upgrade CPU, 2nd RAM slot got defective :|

there's something strange with my system, my stock config was an i7 740qm, 6gb of RAM (2GB & 4GB), dual 5870s...
After upgrade to a 920xm, my 2nd ram slot behave very strange, any ram in that slot will lead to a Win BSOD right after logo "starting windows", even windows reinstall got BSOD too (at "please wait" screen) , it just work with 1st slot!
The weird thing is i can get into safe mode successfully and the rams itself work okay, just that my 2nd slot got defective!
note that if both ram in slots the system pass diagnostics successful
Any ideas with this
many thanks in advance!

 

Ok, for starters...
What's the bsod error ?
Did you switch the RAM banks to see if it's one of them being damaged ?
Did you try putting back the old CPU ?
Did you try a power reset ?
Did you try a memtest ?

 

the error itself very random, from irq_check to pagefile sth to anything, even BSOD with no info

yes, with the same RAM the 1st slot work just fine, while the 2nd one give BSOD immediately
or maybe i don't get you, switch the RAM slots itself?? isn't it soldnered to mainboard

i trade it with my friend so i cannot put it back to test :|

yes i have done a power drain, and no luck at all

no, haven't tried it, but i think i pass diagnostics without problem, so i think memtest86 is not necessary

 

No no, just the sticks not the slot
But at least we can rule out an hardware failure on your RAM, so we have either the controller on your CPU being damaged, you somehow got extremely unlucky and some static current shorted out a component while you were mounting the new CPU, or you have a simple software issue with the new CPU and we just have to see which one it is.

A memtest would give us a confirmation if it's indeed the ram giving off errors or if your new CPU is defective or has some kind of conflict with other software installed on your laptop.
You could also try any other memory intesive program to fill up your ram and see if it bsod your os again.
Something like superpi or prime95 should be perfect, they will also test your CPU so we can see if you're having issue on that side as well.

 

twin snakes, Iceforge's recommendation to run memtest86 is very sound. if there's any issues with the ram, it will show up right away. At the least, it will eliminate the ram sticks as the source of the problem

 

i don't think a static damage, 'cause if it's completely damage, how can it enter safe mode or pass the diagnostics mode??

ok i'll try memtest86 and reply here right away, many thanks for reply
/another thing, i can't boot windows with 2 slots of ram, so if i plug in just 1st slot, can memtest86 detect my problem even there's nothing in 2nd slot??
//oops sr guy, this app run in ms-dos, my bad!

 

How long does this app take to finish, i leave it for 7,5 hours, it reacg test #7 with no error at all, should i go on?

 

The app keeps going forever if you let it. If there are no errors after 7 hrs, i think its good

 

920xm has memory controller build-in
overclocking may cause an inner defect, wich will cause the thing you just described. Cpu doesn't see the second ram bank.
Your 920xm is deffective then, it might been even caused by touching the bottom legs - electro static charge.

My advice, check it in other laptop, but i am sure, it is the CPU.

 

memtest will just test memory installed in slots, it won't test the slots itself.. install memory in the slot and then you won't even boot windows, just boot with memtest cd and you will start the test, I think it will work

 

memtest86 pass 9hs without problem (with 2 ram sticks)
So as flingin said, i thinks the 920xm is pretty much damage or defective
(originally it work flawlessly on my friend's hp elitebook), gotta test it on another machine
/many thanks to you guys!

 

At this point it's really hard to debug without simply putting back your old CPU and see if the problem still happens.
Memtest passed, you manage to boot in safe mode and the system bsod even after a clean reinstall, but you can solve your problems by simply leaving the second ram slot empty...
I'm confused here, the proof is contradictory aaah
Ok, let's start from scratch
Is your motherboard bios updated to the latest revision ?
Did you load defaults when you installed the new CPU ?

 

- yes, the bios is newest when i receive the system (a10), i even tried the unlocked bios but it stay the same
- yes, i even try a power drain
--> at this point, i can only think about 2 possible problem: my cpu (memory controller or sth like that) is defective and/or my 2nd slot ram got fried

 

CPU IS DEFFECTIVE, belive me