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The mystery of the vanishing RAM

post #1 of 14
Thread Starter 
If someone can explain how this is even possible, I will be very grateful.

Every night I turn my PC off. Every morning I wake up and power on my PC only to find 1/3 of my RAM has vanished. I boot with 4GB installed instead of 6GB.

I then shut down and start back up and ill have 6GB again. (note that a restart does NOT bring back 6GB, I have to power off)

The odd thing is, this ONLY occurs after the PC has been off for a few hours - which makes it insanely hard to troubleshoot... I get like 1 attempt to fix the problem per day.

I can shutdown for 30 mins and start back up right now and ill have 6GB...

Heres a memtest screenie to show what I mean:



Specs:
Intel i7 950 -> Corsair H50
Asus Rampage III Extreme
6GB (3x2GB) Corsair Dominator 1600MHz
SLI GTX580s (irrelevant as it occurred with my single GTX275 too)
Silverstone ST-1500 1500W PSU

What I've tried to fix this:

Stock default settings: nope
Different BIOS versions: nope
Raising the DRAM voltage to from 1.65V to 1.7V: nope
Different QPI/DRAM voltages (1.2V to 1.4V): nope
Lowering the DRAM speed / timings: nope
Raising the DRAM speed / timings: nope
Enabling QPI LLC: This helped for one day but then nope...
Moving the RAM into different slots: nope
Reseating the CPU cooler (was advised pressure on the CPU can cause it): nope
Reseating the CPU: nope
Dust in the CPU socket / DRAM slots: nope
Taking everything apart and putting it back together: nope
Messing with random BIOS settings: nope
Pulling hair out and losing sleep: nope

At current my BIOS looks like this:
Target CPU Frequency 3803MHz
Target DRAM Frequency 1654MHz
LN2 Mode: Disabled***
QPI Loadline Calibration:Enabled***


Sync Mode [Enabled]
AI Overclock Tuner [Manual]
OC From CPU level Up [Auto]
CPU Ratio Setting [23.0]
CPU Turbo Power Limit [Disabled]


>CPU Configuration----------------------------


CPU Ratio Setting [23.0]
C1E Support [Disabled]
Hardware Prefetcher [Enabled]
Adjacent Cache Line Prefetcher[Enabled]
MPS and ACPI MADT ordering[Modern]
Intel® Virtualization Tech[Enabled]
CPU TM Function [Disabled]
Execute Disable Bit [Disabled]
Intel® HT Technology [Enabled]
Active Processor Cores [All]
A20M [Disabled]
Intel® SpeedStep™ Tech[Enabled]
Intel® C-STATE Tech [Disabled]


----------------------------------------------


BCLK Frequency [165]
PCIE Frequency [100]
DRAM Frequency [1654]
UCLK Frequency [3472]
QPI Link Data Rate [5964]
Memory Configuration Protect[Enabled]


>DRAM Timing Control--------------------------


CAS# Latency 8[8]
RAS# to CAS# Delay 8[8]
RAS# PRE Time 8[8]
RAS# ACT Time 24[24]
RAS# to RAS# Delay ?[Auto]
REF Cycle Time ?[Auto]
WRITE Recovery Time 10[Auto]
READ to PRE Time ?[Auto]
FOUR ACT WIN Time 24[24]
Back-To-BackCAS# Delay 0[Auto]


Timing Mode 1N[1N]
Round Trip Latency on CHA 59[59]
Round Trip Latency on CHB 59[59]
Round Trip Latency on CHC 59[59]


WRITE To READ Delay(DD) ?[Auto]
WRITE To READ Delay(DR) ?[Auto]
WRITE To READ Delay(SR) ?[Auto]
READ To WRITE Delay(DD) ?[Auto]
READ To WRITE Delay(DR) ?[Auto]
READ To WRITE Delay(SR) ?[Auto]
READ To READ Delay(DD) ?[Auto]
READ To READ Delay(DR) ?[Auto]
READ To READ Delay(SR) ?[Auto]
WRITE To WRITE Delay(DD) ?[Auto]
WRITE To WRITE Delay(DR) ?[Auto]
WRITE To WRITE Delay(SR) ?[Auto]


----------------------------------------------


CPU Differential Amplitude[800mv]
CPU Clock Skew [Auto]
IOH Clock Skew [Auto]


------------ Extreme Engine Digi+ ------------


Digi+ PWR Mode [X-Power]
PWR Volt. Control [Auto]
Load-Line Calibration [Full]
CPU Voltege OCP [Enabled]
CPU PWM Frequency [1000KHz]
Extreme OV [Disabled]*
Extreme OC [Auto]


CPU Voltage 1.200[1.20000]
CPU PLL Voltage 1.802[1.80200]
QPI/DRAM Core Voltage1.325[1.32500]
DRAM Bus Voltage1.670[1.67000]


>DRAM REF Voltages----------------------------


DRAM DATA REF Voltage on CHA[Auto]
DRAM CTRL REF Voltage on CHA[Auto]
DRAM DATA REF Voltage on CHB[Auto]
DRAM CTRL REF Voltage on CHB[Auto]
DRAM DATA REF Voltage on CHC[Auto]
DRAM CTRL REF Voltage on CHC[Auto]


----------------------------------------------


IOH Voltage 1.15X[1.15XX]
IOH PCIE Voltage1.536[1.536X]
ICH Voltage 1.111[Auto]
ICH PCIE Voltage [Auto]*
QPI Voltage OCP [Enabled]*
IOH Voltage OCP [Enabled]*
DRAM Voltage OCP [Enabled]*
QPI PWM Frequency [Auto]*
IOH PWM Frequency [Auto]*
DRAM PWM Frequency [Auto]


---------- Spread Spectrum Control -----------


CPU Spread Spectrum [Disabled]
DRAM Spread Spectrum [Disabled]
RaptoR
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RaptoR
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post #2 of 14
I had disappearing/reappearing ram just before i started getting RAM error beeps. Eventually i had to keep upping the voltage until i hit manufacturers safe voltage ceiling and then just decided to RMA. I hate to say but you have a bad stick somewhere in there.
    
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by wallyworld96 View Post
I had disappearing/reappearing ram just before i started getting RAM error beeps. Eventually i had to keep upping the voltage until i hit manufacturers safe voltage ceiling and then just decided to RMA. I hate to say but you have a bad stick somewhere in there.
memtest will pass without a problem... the PC works fine once all the sticks are detected and I have not had any RAM related beeping.

RaptoR
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post #4 of 14
bios flash? If not then its the ram itself
post #5 of 14
Thread Starter 
I'm using 1102 which is Asus's latest
RaptoR
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post #6 of 14
A heatsink that is tightened too much can cause memory to be missing on cold boots.
post #7 of 14
I had a problem with only 4 gbs of ram showing up when I had an unstable ram timing... Memtest would pass just fine, but windows would only see 4gbs. You might try cutting your memory multiplier back and or loosening your timings.

Then again, the ram wouldn't reappear after I'd booted.
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Raven
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post #8 of 14
Couple of things I can think of:
  • Increase Vtt/QPI a bit more, like 1.35-1.40v.
  • Check for bent CPU pins. If there aren't any, could be that your H50 is mounted too tight.
post #9 of 14
Thread Starter 
Quote:
Originally Posted by Riou View Post
A heatsink that is tightened too much can cause memory to be missing on cold boots.
yes i've seen this mentioned elsewhere....

I've tried mine very loosely fitting and no luck.

I have also tried with lower RAM Freqs and higher timings (9-9-9-30-2t)
RaptoR
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post #10 of 14
Thread Starter 
Quote:
Originally Posted by SimpleTech View Post
Couple of things I can think of:
  • Increase Vtt/QPI a bit more, like 1.35-1.40v.
  • Check for bent CPU pins. If there aren't any, could be that your H50 is mounted too tight.
I've tried 1.4V - no luck.

I don't see how its possible to 'bend' a CPU pin on an i7 seeing as everything is flat... everything appears normal however.
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