BSOD, memory related. bugcheck 0x0000007f

[orentha]

I'm getting random BSODs. They occur sometimes everywhere from 3x in a day to once every 3 days. They are completely random.

here are computer stats:
custom build (had for 4+ years)
Gigabyte P35-S3G motherboard. (with F5 firmware)
Windows 7 professional 64bit
8 GB memory. 4x 2 GB G.Skill F2-8500CL5D
Nvidia GeForce 9500 GT video card


I've run the "Windows Memory Diagnostic" from the admin tools. It comes up with no errors every time.
I tried running each memory stick separately, still no errors.


I have run memtest as well.
And this is where I'm getting errors.
(I ran memtest 3.4 for these tests, before realizing my memtest iso is old, and I now see that they have a version 5.x)

But in Pic 1, this was running memtest with all 4 memory sticks installed. basically, memtest locked up and froze, and hitting escape did nothing, I had to manually restart computer.

Pic 2 is memtest running 2 stick of memory only. Same result, eventually memtest froze and stopped working, and I had to manually restart.


Right now, I'm not sure how to proceed to determine if my memory sticks are the issue, or if the memory slots on the motherboard are the issue, or what the issue is...

Any thoughts or direction for me?

I'm sorry if I've missed any other relevant information. Just let me know what else I should include.

Thanks so much !!

 

[Arc]

Now follow the "Part 3: If You Have Errors:" of How to Test and Diagnose RAM Issues with Memtest86+

Errors/red lines means one or more RAM is faulty. But the fault may occur due to a faulty DIMM slot, too, which is a motherboard component. Using memtest86+, you can discriminate between a faulty RAM and a faulty motherboard.

How? Say you have two RAM sticks and two DIMM slots. You obtained errors at the test with all RAM sticks installed. Now, remove all the sticks but one. Test it in all the available slots, one by one. Continue the same procedure for all the available sticks.
How to make the inference that is it a RAM issue or it is a motherboard issue? Suppose you have got the result like that:

test|Slot1|Slot2
RAM1| Error | Error
RAM2|Good|Good

It is a RAM, a bad RAM.

But if you have got a result like that:

test|Slot1|Slot2
RAM1| Error |Good
RAM2| Error |Good

It is a motherboard issue. The particular slot is bad.

Not checked the crash dumps, as the memory failure may cause any other failure; and as it already determined, it is to be eliminated at first. If any further issue is there after determining and removing the source of memory corruption, we will definitely check the further BSODs.

 

[orentha]

I've finally got through running all my memory sticks separately in all different memory slots.

I let them run for 7 passes on memtest 5.01.
And got no errors on any of them.

Then I put all four back in and ran memtest, and get this: (pic attached)

Where do I go from here ?

 

[Arc]

Thats bad.

Change the entire kit in that case?