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64-bit Vista freezes/crashes with more than 4Gb RAM - Help!

by Catherine_CJD / April 26, 2008 6:43 AM PDT

I hope someone can help me - and THANKS in advance for reading this!

I have a shiny new gaming machine (well, it's 4 month old now, but still very shiny!) It's a custom built PC from - who's tech help is somewhat less than helpful (hence this post...)

Here's what's under the hood:
500GB SATA II Single hard Drive
Intel Core 2 Duo E6850 3.0Ghz 1333FSB CPUs
Asus P5N-E 650i SLI Motherboard
Corsair XMS2 Xtreme DDR2/800 RAM - 4 Gb (2X2Gb sticks) PLUS another matching 4 Gigs (see the 'problem' below)
2 NVIDIA GeForce 8600GT 512MB Video Cards
64-bit Vista Home Basic with SP1
Thermaltake 750W PSU
Thermaltake MaxOrb Cooling Fan
plus an extra case exhaust fan (temp never goes over 86)

I play the Sims 2 with ALL EPs and SPs and TONS (80,000+) of custom created downloads. I kept getting Access Violation errors, and my game would crash. I was told I needed even more memory to handle all my downloads... so I bought another 4 Gb from NewEgg earlier this week. I've already heard that the Sims won't use my new mega-memory. I wanted more memory anyway because I also do a lot of work with Photoshop and run my own website: So, I really don't want to send it back. It's supposed to work with my system and I want it to work! Angry

Here's the problem:
After I install the other 4 Gb of RAM, Vista keeps freezing every half hour or so. It doesn't matter what I'm doing - it is completely random. And the only thing I can do is push the power button for 10 seconds to turn it off. When I take the new RAM out, my PC works great again.

Here's what I've done so far, in order:
I know I installed the new sticks right - I followed the package directions to the letter.
I tried changing the paging file size, but after it crashed I set it back to auto for now.
Swaped out the sticks to be sure they work, and aren't duds. They're fine.
I tried running just 2 sticks in the 'B' slots, but that didn't work at all - I think it's not designed to, but I wasn't sure.
I asked for help on MicrosoftTechNet -
I updated the BIOS yesterday to version 0901 (it was 0801) - and all seems fine; my anxiety level went through the roof during the proceedure, but all is well now. Well, except, Vista still crashes with all 8 Gigs installed.
When rebooting with all 4 sticks in, it finds the memory: 8192 installed, 8191 useable
All the memory sticks are exactly the same EXCEPT the original sticks are 5-5-5-12, and the new ones are 5-5-5-18. I read somewhere that this shouldn't make any difference. All the sticks are Corsair Xtreme with Heat Spreaders: CM2X2048 - 6400C5 (1.90V ver3.1; 800MHz)
Today, I did Vista's built in Memory Diagnostic tool (I found out about it from C-Net) and it checked all 4 sticks - it says there's no problem with any of them.
I also ran the CPU-Z gizmo that I found out about here - it shows each stick of RAMs "stuff" as being exactly the same as far as the 5-5-5-12/18 numbers go. It also said all their voltages were 1.80 (the stick itself says 1.90) I don't know if this means anything or not. I validated, but did not publish the report. So, I can send it to you if you need it?
After that I was up and running with all 4 sticks (8Gigs) - but then it crashed again after 45 minutes...
... which brings me here to ask for your help :unsure:

Do you think the new RAM is at fault - or is there some setting I need to change? I really am not technically inclined ...some may even say I was 'challenged' in this area... This is rocket science! At least, it feels like it to me!

Thank you for thinking with me!

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2 issues.
by R. Proffitt Forum moderator / April 26, 2008 7:44 AM PDT

1. There is an article about install issues with more than 2GB installed. Ask Microsoft for a Vista DVD that does not require us to unplug RAM to install.

2. " It also said all their voltages were 1.80 (the stick itself says 1.90 "

Ask your system builder to set the machine proper to support your RAM. Your settings are incorrect and the machine's maker needs a trip to the wood shed for giving you a machine not ready for you to use.

3. I'm not seeing any performance gains on most software past 2 or 3 GB. But if I offer a machine with 64GB there will be buyers. How do you propose to educate them?

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adding ram probably changed your memory settings
by ramarc / April 26, 2008 10:57 AM PDT

the corsair ram wants 1.9V but you're only giving it 1.8V (which is the default voltage). so crashes/errors are to be expected. since you're using 2gb sticks, they may need another boost to 2.0V to get stable operation. also, make sure your bios timings are 5-5-5-18 (they should match the timings of the slowest sticks).

ps: 8gb is unnecessary for your stated use.

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I think you may be on to something with the timing issues.
by Catherine_CJD / April 26, 2008 11:46 AM PDT

Thanks for answering. I know 8Gb is overkill... I've got a tech-inclined friend coming over to look at the BIOS settings tomorrow. If that doesn't work - I'm sending 'em back Sad

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So far so good!
by Catherine_CJD / April 27, 2008 9:02 AM PDT

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