Cant intsall the 4 ddr2 ram sticks together

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Mgma

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Jan 27, 2015
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I have a problem with my system I've bought 4 2gb 1066 ddr2 hyper x ram
They were working fine I tried to install windows 7 alongside w 10 so I shrink the c partition to do so but it didn't work for me suddenly my PC halted the screen freezes and I can't access any thing even the task manager I have to restart the windows again and the same problem happen I tried to unplug one of the ram and the system works fine I tried changing the ram slot to know which one is defect but they all working fine I run the windows memory diagnostic tool there is nothing wrong with the rams
What is the problem ?
 
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M

Mgma

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Jan 27, 2015
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I bought the 4 ram together from someone they were working fine at first then the PC started to halt and when I remove one of the 4 the computer works fine I tried increase the voltage of ram to 2.0v because the ram requires 2.0v
 
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BFG-9000

BFG-9000

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Sep 17, 2016
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You don't say what system you have, but early Intel DDR2 chipsets were infamous for requiring much more MCH voltage if all DIMM slots are filled, due to the heavier load on the external memory controller. The equivalent voltage on AMD socket AM2+ is VDDNB for the CPU-integrated memory controller. Socket AM2 does not let you set a different memory controller voltage than vCore, so you may need to raise the voltage for the entire CPU.

The 2.0v you have set is VDDIO or voltage to the DIMMs themselves.

I should also point out that for Intel, there is no gain in running the memory faster than the FSB, unless you are unable to manually adjust static tRd--in that case sometimes the defaults for running faster asynchronous memory results in lower latency. So even if you are seriously overclocking at 1600FSB there is usually no benefit to running faster than two channels of DDR2-800, unless you are using an IGP. Otherwise both 1600FSB and two DDR2-800 have 12.8GB/s of bandwidth, so running only the memory faster just makes the FSB the bottleneck.
 
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M

Mgma

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Jan 27, 2015
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I have an AMD system:
A780GM-A
Amd 9500 processor 2.2ghz
WD black 1tb
WD blue 1tb
Gigabyte r7 250 2gb oc
Cooler master 500 psu
And the 4*2 gb 1066 hyper x 2.0v

I tried to raise the voltage of the ram to 2.0v but I haven't tried to raise the voltage of the CPU how could I raise it's voltage to be compatible with ram voltage ?
 
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BFG-9000

BFG-9000

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Sep 17, 2016
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ECS did not give you any way to raise VDDNB. Further, since you have an AM2+ board, raising CPU voltage will not alter the VDDNB because it's not linked to vCore.

So the only stable option if you want to use all of your RAM is to force it to run at a slower speed. Manually set it to DDR2-800 speeds and if that isn't sufficient, then drop the timings @800 to 5-5-5-18 or even slower like 6-6-6.

Windows memory diagnostic is a fine quick test, but passing Prime95 blend for 12-24h with no errors will more definitively prove your settings are completely stable. I should point out that it's not unusual for some AMD chips (even the new Ryzen) to be picky with memory, and when you run 3 sticks everything drops to single channel (no Flex memory mode with AMD) so there is less load on the memory controller.
 
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M

Mgma

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Jan 27, 2015
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rams are already running @800 but only 3 when I installed the 4th one made the PC to halt after signing in windows and sometime when it is booting
 
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