Only one RAM slot working

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GeneralTelcontar

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Oct 26, 2013
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Hello, I've got a problem with my RAM's. It began when I wanted to add 2 more GB RAM to my 4 GB(2x2 GB Kingston HyperX DDR3 1600Mhz KHX1600C9AD3K2/4GB). The new one I bought was a Kingston HyperX Blu with identical proprieties. But stupid me didn't know that my mother board supports only dual-channel so it didn't work having only 3 slots occupied, and it showed 6GB (2GB usable). My mother board is an ASUS P7P55 LX http://www.asus.com/Motherboards/P7P55_LX/#specifications
So I removed the new memory, noticed the PC wouldn't boot at all now, did a BIOS reset from the jumper (at a specialist's suggestion) and then it showed me only 2GB memory despite the fact that I had the original 4GB installed which worked fine before. So I checked every slot with each of the memory and noticed that only slot 4 is working. The first 2 begin a continuous beeping when I start the PC and it doesn't do anything, while the third doesn't make the beeping but still the PC doesn't boot.
Please tell me possible causes and solution. Thanks in advance.
 
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GeneralTelcontar

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Oct 26, 2013
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I have 1201 BIOS version, will try 1202 if you say it might have RAM bug fixes

 
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geofelt

geofelt

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Oct 9, 2006
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Ram is sold in kits for a reason.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards can be very sensitive to this.
That is why ram vendors will NOT support ram that is not bought in one kit.
Although, I think the problem has lessened with the newer Intel chipsets. Still,
it is safer to get what you need in one kit.

New motherboards, and I think your P55 will support odd numbers of sticks. The matching sticks will run in dual channel mode, and the odd stick will operate in single channel mode.

Do some testing using memtest86+.
Start with one stick at a time. Your motherboard manual will tell you which slot to use with one stick. It may not be the obvious one.
You should be able to identify known good sticks and possibly any bad ram slots.
Ultimately, if all else fails, buy a 2 stick kit of supported ram.
 
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Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
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Make sure you have the latest BIOS (basically all BIOS updates have DRAM updates, generally a lot of them), then put the HYper sticks in slots 1-3, boot to BIOS, enable XMP, then change DRAM voltage to 1.55, save, exit, shutdown - add the new stick in slot 4 and try booting, if no joy try it in slot 2
 
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GeneralTelcontar

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Oct 26, 2013
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10,510
So I managed to increase my memory a bit by putting them in slots 3,4 and enabling XMP which resulted in the message 4gb memory (3,49 usable), but if I get 2x4GB memory kits and manage to get around 7GB memory I'm gonna be ok with it
 
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