Solved Dual Channel Ram issue

July 4, 2012 at 05:07:06
Specs: Windows 7
I recently upgraded a noisey cpu, fan and heatsink and decided to buy some more ram whilst i was at it. New heatsink installed nicely and went to put some more ram in, only to find out afterwards that dual channel ram works in pairs. My problem is that after reverting back to just two sticks of ram my bios only shows half the amount of ram available. This also didnt happen straight away but after a couple of days. The ram is installed in the correct slots. Cpu-z says they are running in dual channel mode Unganged. Memtest86+ results no errors in ram. Ive reset the Cmos. and ive tried every single possible combination and reseated them about 8 million times. Ive re installed windows. ive made sure that maximum memory is unchecked in msconfig. ive read every single thing i could find on the net about it and i have ran out of ideas. All ive done is stick the old ram back in. Im wondering whether the mobo is broken or the Cpu's memory controller is broken ? my specs are

Gigabyte MA770T-UD3 (F10)
AMD Phenom II x6 1055T
Corsair CMX4GX3M2A1600C9

if you need any info please ask.

Cheers
Matthew



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✔ Best Answer
July 4, 2012 at 15:00:26
Sorry, I missed that all 4 sticks of RAM are exactly the same - same brand, same spec, same number of chips, same color, etc, etc, etc.

I can't see your board, I can only see what's on the Gigabyte webpage & in the manual that I downloaded. On the site the slots are blue & white, in the manual they're yellow & red. But there's a note under the RAM chart that says: "If two memory modules are to be installed, it is recommended that you install them in the DDR3_1 and DDR3_2 sockets. They're shown as the two closet to the CPU.

If none of them work, not even the originals, you must have done something wrong. When you worked with the RAM, did you unplug the power cord & lay the tower on it's side so the you could exert enough pressure to fully snap the sticks into place? Are you hearing any beeps at start up? Do you normally hear a single beep at startup? If you used to hear a single beep but now hear none, RAM probably isn't your problem. Since you messed with the heatsink/fan at the same time, maybe that's the problem?



#1
July 4, 2012 at 05:43:19
Look into the OTHER specs on the memory, if the timings are not compatible or the voltages are different, they may be causing the issue. If the memory modules have other optional timings or you want to try the 'looser' timing of the two sets, then you will need to manually set your BIOS. If the voltages are different by a couple of tenths, try in between or the higher of the two voltages.

You have to be a little bit crazy to keep you from going insane.


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#2
July 4, 2012 at 06:02:03
Is the RAM you have installed now, the same RAM as you had before?

If not, the RAM may be incompatible due to capacity or density.

Check on crucial.com to see what RAM is compatible.


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#3
July 4, 2012 at 06:19:39
1st, your CPU is an AMD Phenom II x6 1055T. CPUs don't make noise.

2nd, both your CPU & motherboard don't officially support DDR3-1600 without overclocking.

3rd, your new RAM is not true DDR-1600. According to JEDEC standards, all DDR3 RAM is suppose to run at 1.5v & the memory settings are programmed into an EEPROM on the memory stick. The BIOS reads the EEPROM & sets up the RAM speed, voltage, timings accordingly (unless the user overrides them). This is called SPD (Serial Presence Detect). What you bought is XMP memory (XMP = eXtreme Memory Profile) which is for Intel systems. XMP is additional info that is programmed into the EEPROM that automatically overclocks the RAM when XMP is enabled in the BIOS. Here's the explanation from Corsair:

"What is XMP?

XMP is a feature of most current motherboards using an Intel chipset (X58, P55, etc.) which allows for simple overclocking of your memory. Overclocked memory modules often must be manually configured in your BIOS in order to achieve the overclocked settings. A memory module which supports XMP (eXtreme Memory Profile) allows you to simply enable XMP mode in the BIOS which would then automatically configure your memory settings for the correct voltage, speed and latency values."

http://www.corsair.com/en/support/faq/

Intel devoted a page to XMP:

http://www.intel.com/content/www/us...

Since your AMD board doesn't support XMP, the BIOS will read the SPD & the memory will most likely default to 1333MHz. If you want it to run faster than that, you have to manually configure the memory settings in the BIOS. In other words, you will need to overclock it.

And from your motherboard manual: When enabling Dual Channel mode with two or four memory modules, it is recommended that memory of the same capacity, brand, speed, and chips be used and installed in the same colored DDR3 sockets for optimum performance.


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#4
July 4, 2012 at 07:21:11
Yes it is the same ram as before. I have no idea about overclocking or the like. I purchased the machine from an online pc building company. But it's not that I want it to be faster. It's that it is only seeing half of the ram installed. I have 2 x corsair xms3 4gb (2x2) dual channel ram but it's only seeing 4 gb total. In both windows. The bios and CPU-z although CPU-z is saying that it is in dual channel mode. It is well beyond my understanding to overclock but maybe the solution is a new motherboard that supports my other hardware more easily ? any suggestions

Also, I haven't touched the Mem timings for the ram but it stopped working before I reset the CMOS. So the timings if it were that would have been the same as when it was working properly... No ?

Cheers


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#5
July 4, 2012 at 11:34:24
To clarify, there is no such thing as "dual channel RAM". The motherboard runs the RAM in either "single channel mode" or "dual channel mode". And for dual channel mode to kick in, the RAM has to be installed in the correct slots & ALL the sticks MUST all be compatible with each other. XMP RAM wasn't the best choice for your system, but it should work. However, it may not pair up with your old RAM. Regardless, you do NOT need a new motherboard.

I just downloaded the manual for your board. For dual channel mode with 2 sticks, they should be installed in slots DDR3_1 & DDR3_2, in other words, the 2 yellow slots.

http://download.gigabyte.us/FileLis...

You've already told us about the Corsair. And looking at the SPD specs, it should be configured to run at 1333MHz, 1.5v, 9-9-9-24.

http://www.corsair.com/cmx4gx3m2a16...

Now tell us about the "old" RAM. Make/model? Specs?


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#6
July 4, 2012 at 12:03:30
Just to clarify. The ram in the computer is the same ram that has always been in the computer ever since I bought the computer. It's in the same slots as it was when I purchased the computer. The new ram I bought is currently on my desk. 'Not' in the computer. For your information that is also exactly the same type brand and spec. From the mother board manual it states to work in dual channel mode it either needs to be in slots ddr3 1 and ddr3 2 (blue slots) or ddr3 3 and ddr3 4 ( yellow slots) they are currently in the correct slots.

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#7
July 4, 2012 at 13:12:47
Maybe you hit a bit of oxide on the edge connectors (even a slight movement can cause this). Try cleaning the RAM edge connectors with a pencil eraser and then pop the sticks in and out a few times to clear any oxide off the sockets themselves.

Always pop back and let us know the outcome - thanks


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#8
July 4, 2012 at 14:42:53
**** ALSO:
If you failed to turn off the power to your motherboard by a manual switch on the power supply or by unplugging the power from the wall or surge protector, you MAY have damaged the memory OR the socket/memory controller.
**** AND/OR:
If you did not make sure that you had discharged yourself from Static electricity before touching the memory or the internal components, you MAY have damaged the memory, the motherboard/memory controller, or other components.

You have to be a little bit crazy to keep you from going insane.


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#9
July 4, 2012 at 14:50:41
One further thought. Turn off the computer and remove the main battery if it's a laptop. Remove the mains plug then hold the power off button in for about 20 seconds.

I know it sounds crazy but I've known this to cure some issues - a tip I received on these boards. Probably far too hopeful but easy to try.

Always pop back and let us know the outcome - thanks


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#10
July 4, 2012 at 15:00:26
✔ Best Answer
Sorry, I missed that all 4 sticks of RAM are exactly the same - same brand, same spec, same number of chips, same color, etc, etc, etc.

I can't see your board, I can only see what's on the Gigabyte webpage & in the manual that I downloaded. On the site the slots are blue & white, in the manual they're yellow & red. But there's a note under the RAM chart that says: "If two memory modules are to be installed, it is recommended that you install them in the DDR3_1 and DDR3_2 sockets. They're shown as the two closet to the CPU.

If none of them work, not even the originals, you must have done something wrong. When you worked with the RAM, did you unplug the power cord & lay the tower on it's side so the you could exert enough pressure to fully snap the sticks into place? Are you hearing any beeps at start up? Do you normally hear a single beep at startup? If you used to hear a single beep but now hear none, RAM probably isn't your problem. Since you messed with the heatsink/fan at the same time, maybe that's the problem?


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#11
July 4, 2012 at 15:23:13
Thanks for all the help everyone. It's definitely a strange one. I definitely made sure not to kill it with static. I'll have a go with some of the suggestions and get back to you all.

Cheers


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#12
July 8, 2012 at 14:20:01
Might be stupid question but what Win7 do you use ?
32 or 64 bit ?
You need 64 bits OS to see more than 4GB of RAM

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#13
July 9, 2012 at 08:17:37
64 Bit. Its nothing simple Im sure.

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#14
October 4, 2012 at 03:15:42
I got a very very similar problem. It worked perfectly fine before. Got 4 of the exact same ram sticks, but the motherboard refuses to read more than 2 of the 4 slots at a time. (used to have 8GB, now it only sees 4gb). I've tried every ram stick individually in every slot and they all work properly. I've tried every combo of 2 sticks in all possible slot combinations and all worked. However as soon as I add the third and fourth or just a third stick it completely ignores that stick.

I'm 100% sure the sticks are compatible as they have worked properly before. Interesting aspect is that I updated my BIOS shortly before it happened (Not sure if it happened right away after updating). I've already tried downgrading my bios but the flash utility won't let me saying my backup file from the bios is 'outdated'. The Ai Suite program also can't downgrade it because the "Bios interface has been changed/altered". Could it be that the newer bios has different default settings which might cause some of my sticks to stop working(even though they're all the same sticks)?

PS. Already tried the CMOS reset, Battery reset, reseating the sticks numerous times, even moving them around which shouldn't have effect cause they're all 100% alike, also tried switching Memory remap around. )

Anyone got any Idea ?


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