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Memory crashes when OC at 1910+ Rx 470 NITRO Mining ETH

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Hi everyone,

I started mining ETH a few weeks ago with this rig:

MB: MSI Intel H81 LGA 1150 DDR3 USB 3.1 Micro ATX Motherboard (H81M-E33)
CPU: Intel Celeron G1840 Processor LGA 1150
RAM: x2 Markvision 2gb Ddr3 1333mhz-cl9 Oem
GPU: x2 Sapphire Radeon NITRO (not +) Rx 470 4GB GDDR5 Dual HDMI / DVI-D / Dual DP OC (UEFI) PCI-E Graphics Card (Elpida)
HDD: Samsung (320gb/7200rpm/16) -hd322hj (sata)
PS: EVGA SuperNOVA 750 B1, 80+ BRONZE 750W, Semi Modular

At the beginning my avg was 24 Mh/s with each GPU (48.5 Mh/s in total); which I got after OCing a little bit with Afterburner (C. Volt 0/Power Lim 0/Temp Lim 85/Core Cl 1100/Mem Cl 1925/ Fan 65). The voltage goes between 100 and 1040mV and the temperature is between 50 and 52 *c. Then I finally found how to flash my GPUs' BIOS. After that the numbers went up to 27Mh/s per card (53Mh/s in total) even though I had to mod the OCing of the Mem.Clock to 1910 'cause it got quite unstable.

My problem is that if I dear trying to OC the Mem.Clock over the 1925 I will immediately get a blue screen and the rig will restart. Actually, even with the Mem.Clock at 1915/1920 it does that every 2 days or so... I would like to know What is wrong in there? Why can't I try a higher OC in order to get a better performance of my rig? Please give me a hand on this. I really want to know if it's something that can be fixed and how. Thanks in advance for your help!

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