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RAM wont work?

Last response: in Memory
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March 14, 2012 3:35:30 AM

Before we hop on the there is a search button for a reason bandwagon I have indeed used it but nothing seems to be working for me.

I have 12 GBs of ram that all work with my motherboard. For about 3 months all the ram worked fine, I restarted my computer and now only 8gb is usable?? I took a screen shot so you can see that it shows i have all 12 GB but only 8 is usable. I have updated the BIOS I have done the msconfig thing and i cant get this to work.

Any help would be appreciated greatly.

More about : ram wont work

March 14, 2012 3:51:32 AM

What motherboard do you have?
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March 14, 2012 4:11:47 AM

I'd suggest a Google search-it seems there are lots of possible solutions, some of which you have already tried, and some of which seem really strange, like re-seating your CPU fan, but several people swear it worked for them. Another possibility is incorrect RAM timings in BIOS, and RAM reserved for hardware, which you can check from the Resource Monitor.
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a c 132 } Memory
a c 169 V Motherboard
March 14, 2012 4:32:00 AM

If you've been in your bios recently you may have mucked around with the PCI address mapping. This is used to make addressable memory on peripheral devices accessible to the OS. On legacy systems (IE, OSes not running in long mode, AKA 64 bit mode) this was still confined to the 32 bit address space and was taken out of the 4GB of addressable memory which resulted in the infamous 3.25GB of usable memory on a 4GB system problem. This same problem occurs on 64 bit systems when the bios is not properly configured to map the addresses to a higher range and the result is that 8GB can look like 7.2, 12 can look like 8, etc... it all depends on the particular system. Take a look around for this
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a c 146 } Memory
a c 328 V Motherboard
March 14, 2012 11:53:18 AM

I suggest to remove the RAM sticks and place them back again.

Reseating the RAM helps a lot.
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March 14, 2012 12:04:34 PM

What is the RAM capacity listed in bios?

[edit] More importantly, what is your ram configuration? I ask because the board you list has 4 slots, but the only way to get 12gb on 4 slots is by using 3 4gb sticks. That could be your problem.
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March 14, 2012 8:30:57 PM

rpgplayer said:
What is the RAM capacity listed in bios?

[edit] More importantly, what is your ram configuration? I ask because the board you list has 4 slots, but the only way to get 12gb on 4 slots is by using 3 4gb sticks. That could be your problem.


2 x 4GB + 2 x 2GB = 12GB

That would be my guess for his configuration.
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March 14, 2012 8:57:07 PM

Well, looking at those specs, one of them calls for 1.65V and one calls for 1.5V, and it's the 2 x 2GB sticks that call for 1.65V. You shouldn't have an issue if you bump up the voltage enough to make the 2 x 2GB sticks happy-check in BIOS and see what voltage it's running at now, and if it is lower than 1.65V, bump it up and see if that solves it.

Probably your BIOS update killed your overclock, if you had one before. Or maybe the old version of the BIOS was better able to deal with 2 different voltage requirements.
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a c 146 } Memory
a c 328 V Motherboard
March 15, 2012 12:22:27 AM

cTs Corvette said:
Well, looking at those specs, one of them calls for 1.65V and one calls for 1.5V, and it's the 2 x 2GB sticks that call for 1.65V. You shouldn't have an issue if you bump up the voltage enough to make the 2 x 2GB sticks happy-check in BIOS and see what voltage it's running at now, and if it is lower than 1.65V, bump it up and see if that solves it.

Probably your BIOS update killed your overclock, if you had one before. Or maybe the old version of the BIOS was better able to deal with 2 different voltage requirements.

Yep, ^ that is where I was heading too.

Mobos can handle all kind of RAM's, but different voltage between other sticks can do just this!
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March 15, 2012 12:51:57 AM

thanks guys, ive gone everywhere and no one has been this helpful!
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March 15, 2012 1:05:57 AM

i adjusted the voltage higher and still nothing. I might be doing it wrong, but i go into the bios setup and is it DRAM voltage?
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March 15, 2012 1:07:19 AM

Yeah. Are all 12GB detected in BIOS?
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a c 146 } Memory
a c 328 V Motherboard
March 15, 2012 1:16:06 AM

Make sure all is unchecked in the max memory.

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a c 146 } Memory
a c 328 V Motherboard
March 15, 2012 1:17:08 AM

In the msconfig.
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March 15, 2012 1:28:30 AM

its uncheck in the msconfig, how do i check if my bios see's all 12 GBs?
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a c 146 } Memory
a c 328 V Motherboard
March 15, 2012 1:34:41 AM

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a c 146 } Memory
a c 328 V Motherboard
March 15, 2012 1:35:30 AM

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a c 146 } Memory
a c 328 V Motherboard
March 15, 2012 1:38:25 AM

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March 15, 2012 1:57:01 AM

i got it to show the ram and it said only 8191MB so it is only seeing 8GB. How can i update the BIOS to fix this since the MOBO supports different voltages and up to 16GB? I do not have the original MOBO disk
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March 15, 2012 2:35:00 AM

Apparently the "BIOS" update i did didn't do anything so I am going to assume i did it incorrectly.
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March 15, 2012 12:19:34 PM

Have you tried to see if the CL timings are the same on both sets? I know you have a difference in voltage, try seeing if you can get the CL timings to match.
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a c 146 } Memory
a c 328 V Motherboard
March 15, 2012 12:20:46 PM

dchampion1991 said:
i got it to show the ram and it said only 8191MB so it is only seeing 8GB. How can i update the BIOS to fix this since the MOBO supports different voltages and up to 16GB? I do not have the original MOBO disk

OK, can u remove the 8GB and run just that 4GB?
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March 15, 2012 2:37:18 PM

Actually, what I would do is see if removing the 2 x 4GB sticks lets the 2 x 2GB be recognized by BIOS. Right now you don't know if the problem is with the RAM itself or if it's the combination of the two RAMs that's causing the problem. So start with the basics-does the 2x2GB setup work by itself?
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March 16, 2012 1:40:02 AM

yes, they both work if i do them individually
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March 16, 2012 6:25:50 AM

have you checked to see if its useing that ram to your video card in your bios. I had this same problem and that was it
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March 16, 2012 3:18:18 PM

If you have the 4GB working properly, what happens when you add the 8GB? And what voltage is the DRAM running at when all of it is in there together?
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!