Does one bad RAM stick disable two slots?

Nullpersona

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Nov 24, 2015
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I recently purchased 6 Mushkin Enhanced Silverline 8GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model 992074 to complete a set of 8.

One is bad.

only 48 Gigs are showing

Speccy:

RAM
Memory slots
Total memory slots 8
Used memory slots 8
Free memory slots 0
Memory
Type DDR3
Size 65536 MBytes
DRAM Frequency 833.4 MHz
CAS# Latency (CL) 11 clocks
RAS# to CAS# Delay (tRCD) 11 clocks
RAS# Precharge (tRP) 11 clocks
Cycle Time (tRAS) 28 clocks
Command Rate (CR) 2T
Physical Memory
Memory Usage 6 %
Total Physical 48 GB
Available Physical 45 GB
Total Virtual 52 GB
Available Virtual 48 GB

Windows memory diagnostic comes up with no errors, but it may only be checking the 48 GB

 
Solution

Mark_1970

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Nov 14, 2015
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Short answer yes it can as the faulty one disable a whole channel, two cards per channel
 
Solution
If the memory is read by your bios, and reports the full 64Gb of memory.
But in windows the full 64Gb of memory is not reported.


The reason can be down to the version of windows you have running on your system.
Each version of windows from home, to pro, in some cases has a limit on how much memory it can address.

If in doubt you can check on the Microsoft web site on what each version the OS is able to use and access.
It`s often the case when you look in windows and the memory size is not correct to what your bios shows and detects.
I just thought I would mention this as a heads up, that it can be down to a limitation of the version of the os you use.

It may not be your motherboard or the memory at all at fault.
 

Tradesman1

Legenda in Aeternum
May just be an incompatability with the other DRAM (yes even if they are all the same exact model), it's never a good idea to mix packages of DRAM. The sticks in a package have been tested to play together and are thus guaranteed. This is especially true with 2011 socket mobos with 8 slots, many will buy even two 4 stick packages of DRAM for a full 8 sticks rather than an 8 stick package to save money over the price of an 8 stick set and find 'whooops, they don't work!' , that's the reason the 8 stick set costs more, it can take a lot of testing to find 8 sticks that will all play nice. More on this in my article, item 2, here:

http://www.tomshardware.com/reviews/ddr-dram-myths,4155.html

 

Nullpersona

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Is there a way to use the odd stick as virtual memory, instead?


Only 48 Gigs post.(49)

I checked, and 64 Gigs is within the limits.



The original two, and 5 of the new ones work.

I can run the 7 individually, or paired up to triple channel, but te last stick will not post, or register in combination with any other.

I am aware of the compatibility issue, which is why I am loathe to go through the return process, only to find that the new stick is incompatible.

If the one stick is going to cost me two slots, I don't really have a better option, though.
 

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