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Windows 7: 2gb RAM OK but 4gb = BSOD

25 Oct 2009   #11
silentcontrol

Windows 7 Professional x64
 
 

According to cpu-z, it's a Transcend DDR2 JM800QLU-2G PC2-6400 (400 MHz).


My System SpecsSystem Spec
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25 Oct 2009   #12
torrentg

7600.20510 x86
 
 

That's actually 800 mhz memory. PC2-6400 means that.

Here is the datasheet on your exact model. Do not change any voltages. The modules are intended to run at 1.7v to 1.9v. The standard 1.8v is perfect.

http://www.transcendusa.com/support/...-2G_2980-S.pdf
My System SpecsSystem Spec
25 Oct 2009   #13
silentcontrol

Windows 7 Professional x64
 
 

oh, i see. alright thanks for the information.
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25 Oct 2009   #14
frolix22

Windows 7 Professional x64 Service Pack 1
 
 

Thanks to torrentg for the information in this thread. I am using 4x1GB OCZ RAM at the moment and am waiting for my Windows 7 disk to arrive in the post. I shall keep this thread in mind when I install.
My System SpecsSystem Spec
26 Oct 2009   #15
christophero

Windows 7 RTM
 
 

Unfortunately, it worked perfectly (after switching RAM Voltage to 2.1V) at first boot. Yey I thought, used the PC for a while and then shut it down. Let it be for a 24 hrs something and then rebooted - now I get a new type of bsod (this kind I have not recieved before, good or bad I do not know). Bsod is as follows:

c000021a { Fatal System Error }
The initial session process or system process terminated unexpectedly with a status of 0x00000000 (0xC0000221 0x001003a8)
The system has been shut down

Darn. I force power off, reboot, choose "Launch windows normally" instead of "Launch system repair" and everything works just fine. The previous bsod's also behaved in this way, after reboot all is ok. That's the most confusing part.
My System SpecsSystem Spec
26 Oct 2009   #16
torrentg

7600.20510 x86
 
 

From what I read when I briefly checked on that error, it seems like it is possible it's due to an incorrect or faulty driver on the system.

I know this is for XP, but codes generally mean same thing or very similar in nature.

"This problem may occur if you install an inappropriate driver for your hardware"

"STOP: C0000221 unknown hard error" or "STOP: C0000221 STATUS_IMAGE_CHECKSUM_MISMATCH" error message occurs

Seems software related, not hardware.
My System SpecsSystem Spec
26 Oct 2009   #17
torrentg

7600.20510 x86
 
 

Post a mindump so we can look at it. Upload to Rapidshare.

C:\Windows\Minidump
My System SpecsSystem Spec
26 Oct 2009   #18
torrentg

7600.20510 x86
 
 

I was just checking this out and again, although this is older and XP mostly, seems lots of people had issues with DVD drive.

Annoyances.org - c0000221 Unknown hard error /ntdll.dll (Windows XP Discussion Forum)

Anyhow, it's not a bad thing to also check that all your Windows files are intact and the correct versions. Open an elevated command prompt and run this command if you wish:

sfc /scannow

Do you know your bios version? The latest seems to be P5KPL 0703 BIOS
My System SpecsSystem Spec
27 Oct 2009   #19
christophero

Windows 7 RTM
 
 

I will asap do the following:
  1. Disconnect my DVD-drive to locate whether it is the cause of any of the problems. Also I will disconnect my card reader, which I reconnected after successful boot after ram voltage switch.
  2. Post a minidump when I recieve next bsod (however the last bsod, saved no minidump file even though I have that option checked, so the only dumpfile I have is about a month old, and it is a different "kind" of bsod, prior to the voltage change.)
  3. Check my windows files with sfc /scannow
I have already:
  1. Updated BIOS to the latest version
  2. Updated all drivers for all hardware including chipset and such, this was however pre the last install (since then I have formatted and some drivers might now be out of date), however that did not seem to solve the problem so I'm figuring there's no need for it now.
My System SpecsSystem Spec
30 Oct 2009   #20
christophero

Windows 7 RTM
 
 

The sfc /scannow resulted in the following:
"Verification 100% complete.

Windows Resource Protection did not find any integrity violations."
My System SpecsSystem Spec
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 2gb RAM OK but 4gb = BSOD




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