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Dual Channel Suddenly Stopped Working, Only Single Channel Remains
Hey everyone
I got a bit of a problem here, and I'm at a loss on what to do to fix it.
Some background about the situation would be a good place to start. A few days ago I came home from work and found my PC in a "lights are on, but no one's home" state. The power button was lit up and the fans were in motion, but the monitors were in power saver mode, not the normal on state with the blank screen saver. I tried moving the mouse, mashing on the keyboard but nothing happened. So I reset the machine and it just went to a blank screen, no beeps, or messages, just the same ole lights on no ones home deal again.
Now before this I had been having memory problems, with blue screens saying "memory management" and "IRQL not less than or equal". So I thought it might be a bad strip of ram, and even bought two more strips to replace the ones I had removed. In the process of testing each strip I discovered that one was bad. (That was not the fix by the way)
After putting in the new ram in for a total of 8GB's of ram (figured if I'm gonna buy new ram might as well increase the total amount) it booted up and no more blue screens after loading into windows, YaY it was fixed or so I thought. A few weeks later the above incident occurred and the only way to get the PC to boot up was to pull two strips of the ram and insert the remaining strips into slots 1 and 3 for a single channel configuration. Didn't matter which set of ram I used, just so long as I didn't mix two different brands on the same channel. It's never needed to be set in that manner before. CPUID reports it as single channel, with a blank entry in the DC mode, so I assume its ganged up and in single channel, YUCK!
While the PC is operational, since I'm typing this up on it, I know its not at its optimal configuration which annoys me to no end. After researching the problem via Google and numerous forum post with info unrelated to my exact problem I decided to write up a post, in the hopes that some one out there can help me to figure out if the problem lies in my motherboard (doubtful) or in the processors integrated memory controller.
I think its the Phenom's memory controller that is faulty, or failing. It's been in operation since 2009, almost continuously and its been a good computer and still is. I think the new ram might have been the culprit that shot my memory controller in the back. There CAS/RAS ratio's do not match by one number one is at CAS 6 the other set CAS 5, and when all 8GB's was installed the ram would run at 667 not the 800mhz it's rated to run. So like a dumb ass, not knowing enough. I went in the BIOS and overrode the auto setting for the ram and set it 400mhz vs the 333mhz it was defaulting to. Did I inadvertently over work the memory controller? All the current Ram I have is working and not faulty. So that only leaves the Mobo and the processor.
I don't have tons of cash to spend, I'm a poor man. So before I bite the bullet and buy a new Phenom to replace the one I have I'd like to try and verify if that is indeed the problem.
System Info:
- Asus M4A785-M Motherboard
- AMD Phenom II X2 550 B.E. 3.1Ghz (unlocked and over clocked it once but it was unstable, back in 2009)
- NVIDIA 9800GT 1024GB @ 900mhz, Core 550mhz Bit Width 256 Bit
- 4 to 8GB's of Ram, when it worked it was at 8GB's now it's at 4GB for now.
- 3 SATA Hard drives all independent of each other, not raided.
- 730W OCZ PSU
I think that's the gist of the system info one would need. If it is indeed my processors memory controller and there is nothing that can be done with what i have on hand to correct the problem then I plan on buying a Phenom II X4 965. It's about the same price as my X2 was in 2009. Plus it has the same socket and should work with my motherboard. Could the motherboard some how be at fault, how can I test this without additional hardware?
Here is more information about my memory.
Sorry I didn't post enough information, here are the timings for the ram that is currently installed.
Newer Ram Specs:
Type DDR2
Size 4096 Mega Bytes (4GB)
DRAM Frequency 400.0Mhz
FSB : DRAM 1:2
CAS#CL 5.0 Clocks
RAS# to CAS# Delay 6 Clocks
RAS# Precharge 6 Clocks
Cycle Time 18 Clocks
Bank Cycle Time 24 Clocks
Command Rate 2T
Channels# Single
NB Frequency 2000 MHz
Older Ram Specs
Type DDR2
Size 4096 Mega Bytes (4GB)
DRAM Frequency 400.0Mhz
FSB : DRAM 1:2
CAS#CL 6.0 Clocks
RAS# to CAS# Delay 5 Clocks
RAS# Precharge 5 Clocks
Cycle Time 18 Clocks
Bank Cycle Time 23 Clocks
Command Rate 2T
Channels# Single
NB Frequency 2000 MHz
As you can see there almost identical and the PC used to be able to run either set so long as they were not mixed up. I.E two matching strips in the blue slots and two matching strips in the black slots. Dual Channel is acheived by pairing the memory in side by side slots. Which at the moment it is not set that way, in order to make the system boot up.
While I had the case open a few mins ago to swap the ram, I tried putting the ram in dual channel on slots 3 and 4 but the same thing happens. I turn on the system and it just sits there, you can hear the HDD do a read operation and the CD rom flashes its light and then it just sits there dead for all intents and purposes.
Last edited by Britton; 07 Apr 2013 at 12:06.