This is the only time I've had to deal with memory failure, so I don't know what I'm doing 
I built my PC close to 10 years ago:
i7 930
Asus p6x58d-e https://www.asus.com/Motherboards/P6X58DE/
6 GB Corsair XMS 3 DDR3 TR3X6G1600C9 - 3 lots of 2 GB - timing 9-9-9-24 1.65V
A few years after I bought:
12 GB Corsaid Dominator CMP12GX3M3A1600C9 - 3 lots of 4 GB - timing 9-9-9-24 1.65V
I put the new memory in (on its own) and loaded up. Before long I got BSOD, so I thought I may have faulty memory and swapped back and all was fine for a while. Eventually I was getting BSOD due to (I think) my power supply. I upgraded my power supply and all has been good since (with old 6GB memory).
I've just moved office, so I thought I'd try the 12GB again.
First, I and memtest 5.1 with my 6GB. I only ran it for a couple of hours, as I wasn't expecting problems, and it passed a few passes.
I removed the memory and inserted the 12GB and ran memtest. It failed within an hour (probably the first pass, I can't remember). So I decided to test each stick one at a time.
The first stick passed 3 passes, then I swapped to the 2nd stick.
The second stick passed 2 passes, then I swapped to the 3rd stick which I'd leave running overnight.
The third stick passed 8 passes.
When tested individually, each stick was in slot 0. Is that the right thing to do?
I noted from the memtest the timings: CAS: 8-7-7-20 @64 bit mode. I imagine I had set it to 9-9-9-24 in the past, but I must have set it to default at some point for it to be 8-7-7-20.
So I changed it to 9-9-9-24, inserted the 3 * 4GB sticks in, and run memtest again. It failed (errors) in under 2 minutes.
I plan to run the first and second sticks over night too, but in the meantime I'd like to learn a bit more (and I need to use my PC). I'm currently using the PC with the second stick in on it's own.
Questions:
I don't know what voltage the memory is using, I assume it's auto? If I set it manually, should it be 1.65V, or higher or lower?
Is it possible that a problem will only exist when I have all 3 sticks together, or should I find a problem with stick 1 or 2 when I run memtest it long enough?
If I do find that one stick is bad, presumably I can use the 2 good ones with my 3 2GB sticks: The 2GB sticks in A1, B1, C1, and the 4GB sticks in A2 and B2, leaving C2 blank.
Many thanks
I built my PC close to 10 years ago:
i7 930
Asus p6x58d-e https://www.asus.com/Motherboards/P6X58DE/
6 GB Corsair XMS 3 DDR3 TR3X6G1600C9 - 3 lots of 2 GB - timing 9-9-9-24 1.65V
A few years after I bought:
12 GB Corsaid Dominator CMP12GX3M3A1600C9 - 3 lots of 4 GB - timing 9-9-9-24 1.65V
I put the new memory in (on its own) and loaded up. Before long I got BSOD, so I thought I may have faulty memory and swapped back and all was fine for a while. Eventually I was getting BSOD due to (I think) my power supply. I upgraded my power supply and all has been good since (with old 6GB memory).
I've just moved office, so I thought I'd try the 12GB again.
First, I and memtest 5.1 with my 6GB. I only ran it for a couple of hours, as I wasn't expecting problems, and it passed a few passes.
I removed the memory and inserted the 12GB and ran memtest. It failed within an hour (probably the first pass, I can't remember). So I decided to test each stick one at a time.
The first stick passed 3 passes, then I swapped to the 2nd stick.
The second stick passed 2 passes, then I swapped to the 3rd stick which I'd leave running overnight.
The third stick passed 8 passes.
When tested individually, each stick was in slot 0. Is that the right thing to do?
I noted from the memtest the timings: CAS: 8-7-7-20 @64 bit mode. I imagine I had set it to 9-9-9-24 in the past, but I must have set it to default at some point for it to be 8-7-7-20.
So I changed it to 9-9-9-24, inserted the 3 * 4GB sticks in, and run memtest again. It failed (errors) in under 2 minutes.
I plan to run the first and second sticks over night too, but in the meantime I'd like to learn a bit more (and I need to use my PC). I'm currently using the PC with the second stick in on it's own.
Questions:
I don't know what voltage the memory is using, I assume it's auto? If I set it manually, should it be 1.65V, or higher or lower?
Is it possible that a problem will only exist when I have all 3 sticks together, or should I find a problem with stick 1 or 2 when I run memtest it long enough?
If I do find that one stick is bad, presumably I can use the 2 good ones with my 3 2GB sticks: The 2GB sticks in A1, B1, C1, and the 4GB sticks in A2 and B2, leaving C2 blank.
Many thanks