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Windows 7: RAM issue


14 Jan 2010   #1

Microsoft Windows 7 Professional 64-bit 7601 Multiprocessor Free Service Pack 1
 
 
RAM issue

Hi everyone,
I've recently upgraded to Windows 7 and want to install a fourth gig of RAM to improve performance. I currently have 3x 1GB chips installed.
2 of them are Corsair 1GB DDR2 800MHz/PC2-6400 XMS2 @ 5-5-5-12
The 3rd is the same but runs at 5-5-5-18.
The fourth stick which I just bought is the same as the third. But having installed it the PC will not boot. Power comes on, fans are running and the power light flashes on & off. I get no display or bios post. Sometimes the power comes on then goes off then on and off again, like a car not being able to start.
Taking this new RAM out solves the problem and it all runs perfectly again.
I am aware that the new RAM may be faulty however I would like to get some feedback on whether it could be something else that could be causing this problem?

Thanks in advance


My System SpecsSystem Spec
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14 Jan 2010   #2

Vista Ult 64 bit Seven Ult RTM x64
 
 

Hello Juice,

Welcome to Seven Forums.

Will it boot with just the new stick? Will it boot with the new stick and the one that matches it?
My System SpecsSystem Spec
14 Jan 2010   #3
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Mixing sticks is definitely not a good idea. Even if you get it to run, the slowest stick will determine the pace. What you can try is swapping the slots.
1. try matching ones on 1+2 and 3+4
2. try the matching ones on 1+3 and 2+4
My System SpecsSystem Spec
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15 Jan 2010   #4

Microsoft Windows 7 Professional 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

Hi Guys, the reason I'm mixing is because Corsair no longer make the 5-5-5-12 sticks so I had to get close as. The only time the PC will not boot is with the new stick in. It works fine with the other 3 even though they are mixed and unfortunately I have already tried swapping slots. Interesting what you say about the slowest stick determining the pace, I checked the bios and the RAM speed is set at 5-5-5-18. Relevant?
My System SpecsSystem Spec
15 Jan 2010   #5

Windows 7
 
 

Are the sticks all rated at the same voltage? They can vary from 1.8 to 2.2v. If the new one is rated at 2.1v and the old ones 1.8v you may have a problem if the m/b is running with 1.8v.
My System SpecsSystem Spec
15 Jan 2010   #6

Win7 Ultimate X64
 
 

Try downloading and running memtest86
Burn the image to disk, boot from it then it will test ram for you
Would be quicker if you did it with only the one suspect stick in
Memtest86.com - Memory Diagnostic
My System SpecsSystem Spec
15 Jan 2010   #7

Windows 7 Ultimate RTM
 
 

Have you tried the new stick of memory on it's own?
My System SpecsSystem Spec
15 Jan 2010   #8

Windows 7 Ultimate 32 bit
 
 

Quote   Quote: Originally Posted by juice View Post
Hi Guys, the reason I'm mixing is because Corsair no longer make the 5-5-5-12 sticks so I had to get close as. The only time the PC will not boot is with the new stick in. It works fine with the other 3 even though they are mixed and unfortunately I have already tried swapping slots. Interesting what you say about the slowest stick determining the pace, I checked the bios and the RAM speed is set at 5-5-5-18. Relevant?
that is not your ram speed those numbers are your timing
My System SpecsSystem Spec
15 Jan 2010   #9

Microsoft Community Contributor Award Recipient

Windows 7 SP1, Home Premium, 64-bit
 
 

If the new stick is compatible with the motherboard (form factor and voltage) and the PC cannot boot from that stick by itself in any slot when other sticks will boot, it must be a bad stick.

Up to you to confirm form factor and voltage and to rotate single sticks and slots to confirm by process of elimination that only the new stick won't boot regardless of slot.

I never heard of stock timings preventing a boot for a single stick.
My System SpecsSystem Spec
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 RAM issue




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