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Strange problem

post #1 of 3
Thread Starter 
Hi all,


I posted a while back as I kept getting BSOD with some new RAM.
After testing each stick individually I discovered 2 of the 4 sticks had errors (memtest86). I tested the DIMM slots with other RAM to make sure it was the modules, not the motherboard.

I RMA'd the faulty sticks, and have 2 newer ones, x2 2GB and x2 1GB to total 6GB now.

The system seemed to work fine for a few days so I did a little overclocking, and took my C2D E6750 to 3GHz (375 x8) and ran for 18 hours straight on Orthos Small FFT. No errors.

I tried to bump it upto 3.2GHz (400x8) but I couldn't get my system to post, no matter how much volts I bumped the vcore and North Bridge. Not a very happy OC for this CPU, but I decided stable is better than dead and went back to the 3GHz OC.

I underclocked the RAM to get 1:1 sync, and left the voltage at its rated(ish).....
2 of my stick are rated at 2.1V (the 2x1GB sticks) and the other 2 are rated at 1.8V (2x2GB). They are both PC6400.

Everything worked fine in stress tests and gaming for 24 hours, then blue screen after blue screen.

Sometimes the system reboots and gives me a series of beeps (long beeps on Award BIOS suggest RAM). Other times the system fails to post, freezes on splash screen, or BIOS.

I have now taken each RAM stick out, tested all 4 sticks in memtest86 for 5 passes, each stick, no faults.

I chalked it up to using different voltage rated sticks, and took out the old 2x1GB sticks, and tried memtest again. No errors still.
The system boots up 50% of the time, and crashes a lot. So I assume maybe its one of the RAM sticks. Orthos Large FFT RAM stress test confirms errors within 10 minutes usually.

However, when I remove 1 stick and test it, I never seem to find any errors.
I've spend days switching the RAM to other DIMM slots and testing, finding no errors. Though as soon as I put them both in, crashes come instantly in orthos and windows freeze/crash even though memtest still finds no errors!

Is there any reason they crash my computer together, but not seperatly!?

I'm so confused and fustrated after weeks of testing with no apparent cause.
Runaround Sue
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6750 GA-N650SLI-DS4 8800 GTS 512MB G92 OCZ Platinum PC6400 800Mhz 
Hard DriveMonitorPowerMouse
600 GB Seagate 7200RPM 32'' LCD via HDMI 650W Stock Microsoft Habu 
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Runaround Sue
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6750 GA-N650SLI-DS4 8800 GTS 512MB G92 OCZ Platinum PC6400 800Mhz 
Hard DriveMonitorPowerMouse
600 GB Seagate 7200RPM 32'' LCD via HDMI 650W Stock Microsoft Habu 
Mouse Pad
Steelseries 
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post #2 of 3
Can you even run 2x 1GB and 2x 2GB? Shouldn't the RAM sticks be of the same capacity?

Did you try running without the 2x 1GB?
    
CPUMotherboardGraphicsRAM
E8400 GIGABYTE GA-P35-DS3L eVGA 9800GT Stock Speeds GSkill 4GB (2x2GB) PC6400 
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Samsung F3 500GB Samsung 22X DVD Drive Windows 7 64-bit 22" Acer x223w 
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CPUMotherboardGraphicsRAM
E8400 GIGABYTE GA-P35-DS3L eVGA 9800GT Stock Speeds GSkill 4GB (2x2GB) PC6400 
Hard DriveOptical DriveOSMonitor
Samsung F3 500GB Samsung 22X DVD Drive Windows 7 64-bit 22" Acer x223w 
KeyboardPowerCaseMouse
IBM Model M Model 1391401 Antec EarthWatts 500W Troglodytic Tech Terminal Razer Deathadder 
Mouse Pad
Steelseries Qck+ 
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post #3 of 3
Thread Starter 
Yes it is possible to run sticks of different capacity.
I have another machine on 2 sticks of 1GB and 2 512MB.

I have tried just running on the 2x2GB, which errors occour. However individually no errors occour. I'm stumped.
Runaround Sue
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6750 GA-N650SLI-DS4 8800 GTS 512MB G92 OCZ Platinum PC6400 800Mhz 
Hard DriveMonitorPowerMouse
600 GB Seagate 7200RPM 32'' LCD via HDMI 650W Stock Microsoft Habu 
Mouse Pad
Steelseries 
  hide details  
Reply
Runaround Sue
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6750 GA-N650SLI-DS4 8800 GTS 512MB G92 OCZ Platinum PC6400 800Mhz 
Hard DriveMonitorPowerMouse
600 GB Seagate 7200RPM 32'' LCD via HDMI 650W Stock Microsoft Habu 
Mouse Pad
Steelseries 
  hide details  
Reply
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