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System instability after RAM upgrade

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  • RAM
  • Memory
Last response: in Memory
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July 16, 2014 6:22:27 AM

Hi all,

I am experiencing several issues after finally getting my ram upgrade "working"

- Occasional BSOD
- Occasional freezing
- Running an average game (Bioshock 1) on full screen mode now crashes after a while.

System specs:

Intel core i5 750 2.66GHz LGA 1156 8MB L3 cache

ASUS P7P55D iP55 LGA 1156 motherboard
http://www.asus.com/Motherboards/P7P55D/specifications/

Sapphire HD5770 1GB GDDR5 Dual DVI, HDMI display PCI-E

RAM:
http://www.amazon.co.uk/Corsair-CMX4GX3M2A1600C8-Perfor...

I originally had 2x2GB sticks of the same RAM in my system and never had any issues. When I bought 2 extra sticks of the same model/timings is where my problems started.

At first I had the common issue if Windows recognising 8gb but 4gb available. After following several forums and reseating/checking memory sticks individually etc I did manage to get it working. I had noticed that my 4gb was running at C9 timings in the BIOS and at 1333 instead of 1600.

Strangely enough, it wasnt untill I accidentally changed the time in the BIOS when it was suddenly all recognised (full 8gb) and turning on the Xtreme phase full power mode set it to 1600/C8/1.65v

My Motherboard supports up to 16gb, 2000 OC speed so it doesnt seem like it cant handle the current settings. I now just have random crashes and less reliability than when running on the 4GB. All the RAM sticks seem to be fine individually and the slots seem ok so cant think of much else to check.

Also I've had no issues with power problems prior to this so I dont think 2 sticks of ram could be pushing it over the edge.

Any advice would be greatly appreciated.

#Extra info#

I found this quote on another thread which may be the cause, although before I set XMP on it was defaulting to a C9 timing and 1.50v:

"Ok, running RAM at 1600 MHz is not as easy with an i5 750 as with an i7 860 or 870.

By default the P55s run at a BCLK = 133, the system memory multiplier is 10x (10x133=1333MHz) and as an example the i7 860's CPU clock ratio (cpu multiplier) is 21x (21x133=~2.8GHz).

With an i7 860 you are allowed to up the memory multipler to 12x. An i5 750 cannot go higher than 10x. But these means at stock bclk the fastest you can set the RAM to is 12x133 = 1600MHz for an i7 860. While for the i5 750 the fastest you can set the RAM to is 10x133 = 1333MHz.

To get any faster you have to OC your CPU."

More about : system instability ram upgrade

July 16, 2014 9:32:24 PM

Weird. What power supply do you have?
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a b } Memory
July 16, 2014 9:46:26 PM

Lot's of times 2 kits of the same exact model will not work together. The sticks were not tested together to see if they worked together OK, like a 4x2Gb kit would have been.
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Best solution

a c 2286 } Memory
July 16, 2014 11:12:35 PM

Try raising the DRAM voltage + 0.07 above the rated voltage (yes it's safe). May also need to add about + 0.05 to the MC (memory controller) voltage, that may well get them to play nice together.
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