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ARRGH! 8GB of MEM not stable!!!

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June 23, 2011 4:54:46 PM

Can't get 8GB to run stable on my system. 4GB works great. I've tried upping voltage of MCH & DRAM to no avail. Also tried bringing it down in speed from 800 to 667.

The modules have been bought in pairs of 4gb. I originally purchased 2 pairs but 1 module was not posting. Corsair RMA'd me a new pair and I haven't been able to get it stable. Computer freezes still, sound if playing rolls along then freezes.


Suggestions.

GA-EP45-DQ6
Q6600
(4) 2GB Sticks of Corsair XMS2 RAM
8800GTS
Corsair 750W Powersupply

More about : arrgh 8gb mem stable

a c 347 } Memory
June 23, 2011 5:17:14 PM

Welcome to Tom's Forums! :) 

ref - http://www.gigabyte.us/products/product-page.aspx?pid=2...

What BIOS version are you running? If uncertain you can use CPU-Z http://www.cpuid.com/softwares/cpu-z.html or boot to the BIOS. Reading the BIOS history either F11 or F12 would be a good idea and at minimum F9.

Install each set in it's own color DIMM slots: CPU | set1 | set2 | set1 | set 2 | and next with the 4 sticks use the Clear CMOS jumper method per the manual.

Q - What exact XMS2 DDR2 set do you have and are they ALL identical?
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June 23, 2011 5:24:45 PM

I'm on F12 Bios. Not sure how to Clear CMOS jumper from the manual. But I've cleared via button on motherboard already.

A - Corsair XMS2 4 GB : 2 x 2 GB Memory - DIMM 240-pin - 800 MHz ( PC2-6400 )
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June 23, 2011 5:26:05 PM

I purchased two sets of the same dual channel kit.
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a c 347 } Memory
June 23, 2011 5:55:00 PM

The CMOS Switch works the same, did the Date & Time clear? If not then it didn't clear. See page 32 of the manual. Most issues like this are corrected with a proper Clear CMOS procedure.

Tested Corsair RAM -> http://www2.corsair.com/configurator/product_results.as...
The only tested XMS2 is the TWIN2X4096-6400C5 2x2GB DDR2 800MHz, 5-5-5-18-2T @ 1.80v

BIOS:
Load Optimized

Verify CPU Host Frequency (Mhz) -> 266 MHz

Performance Enhance -> Turbo
Extreme Memory Profile (X.M.P.) -> Disabled
System Memory Multiplier (SPD) -> 3 (3*266 = 800 MHz)
DRAM Voltage -> 1.85v~1.90v (stock is 1.80v)
DRAM Timing Selectable (SPD) -> Manual
CAS Latency Time -> 5
tRCD -> 5
tRP -> 5
tRAS -> 18
Command Rate (CMD) -> 2

If that fails adjust the CAS timings:

CAS Latency Time -> 6
tRCD -> 6
tRP -> 6
tRAS -> 18
Command Rate (CMD) -> 2
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June 23, 2011 6:04:01 PM

ok. while i was waiting for reply, tried something i should have done a while ago...

tried the new 4gb by itself and my computer froze. Assuming that one if not both of those modules is no good.

should I still try your latest suggestion? Is there still hope?

thanks for your time and awesomeness.
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a c 347 } Memory
June 23, 2011 6:13:52 PM

RMA -- AGAIN the 'new' RAM :(  It's BAD!!!

Look carefully that the Part Numbers and Revision Numbers are ALL the same on ALL 4 sticks. IF they're not then your mixing RAM.
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June 23, 2011 6:22:54 PM

All numbers are identical except for lot numbers per pair. I'm going to try and find the bad module by installing 6gb in flex mode and swapping out new modules.

Thanks,
Jeff M.
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June 23, 2011 6:43:19 PM

Umm. don't get it. the new 4gb they sent me from RMA doesn't work by itself but when I use two of the original modules + either one of new modules everythings fine in flex mode.

Since this isn't making sense to me at all I'll try and install all 8gigs and changing the CAS timings to what you've suggested. I've already tried running it at optimized defaults.
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a c 347 } Memory
June 23, 2011 6:53:01 PM

Try the Manual settings above, on your MOBO I've seen where some folks have set the CAS slower {CAS +1} to post and went back in the BIOS and lowered them back to stock and everything was okay.

I'd try the settings I have above, and installed asd suggested CPU | set1 | set2 | set1 | set 2 | .
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June 23, 2011 7:42:42 PM

Hey Jaquith,

I tried all Manual settings above and made sure all modules were installed in correct colored socket. 5-5-5-18 cmd 2 looked like it was going to work for a second but once I opened 64bit After Effects or Avid Media Composer it froze.

Flex Mode with 6gb installed seems stable have both programs open and rendering at the same time.

Do you think Corsair RMA'd me some bad modules or do you think that its my MOBO? Any other suggestions.

thanks so much,
Jeff
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a c 347 } Memory
June 23, 2011 8:02:23 PM

As I posted try the following. Initially just increase the DRAM Voltage -> 1.90v and if that poaches then try the CAS +1.

If that fails adjust the CAS timings:

DRAM Timing Selectable (SPD) -> Manual {if there's an option for Quick use Quick}

DRAM Voltage -> 1.90v
CAS Latency Time -> 6
tRCD -> 6
tRP -> 6
tRAS -> 18
Command Rate (CMD) -> 2

Let me know, then I'll conclude what to do.
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June 23, 2011 8:29:56 PM

Hey,

Just to let you know. I have tried these (in sequence)

-adjusting DRAM voltage up to 1.9
-adjusting CAS +1 setting DRAM voltage back to Auto
-adusting CAS +1 adjusting DRAM voltage up to 1.9

Pretty sure I followed your settings completely.

Thanks
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a c 347 } Memory
June 23, 2011 9:17:15 PM

botjef said:
it was going to work for a second but once I opened 64bit After Effects or Avid Media Composer it froze.

Q - Is it just those applications or are there other Apps doing the same thing?
Q - What OS are you running?

I recall when I installed Adobe Acrobat Pro 8 I had a similar issue in that the App bombed on my Win 7 Pro x64, upon researching I had to manually replace some component from Adobe's site {Jerry-rigged the install} and it fixed the problems.

I'd look at the Event Manager's Critical errors and see if anything is listed. Next run MSCONFIG -> Diagnostic and see if the problems clear-up, and lastly if Adobe has a similar 64-bit fix.

However, if only 64-bits Apps are BSOD then re-install the INF file {chipset} and any of the drivers for your OS from GA's site.

Lastly, if none of the above pertains then RAM RMA/Return the RAM.

Event Manger:
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June 23, 2011 10:28:40 PM

Wasn't just the Ap's. Because it crashed just from opening up chrome before as well. or from just opening up a window.

Working in XP 64 bit

Thanks so much for your help and time.
jeff
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a c 347 } Memory
June 23, 2011 10:53:29 PM

As you know, XP-64 bit isn't helping ;) 
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June 24, 2011 1:57:24 AM

Put only the new ram in and run memtest86 overnight, if you get errors its bad.
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June 24, 2011 1:58:02 AM

64bit XP never was stable, that could be the issue.
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