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Random changing RAM Availability

post #1 of 4
Thread Starter 
First off, I apologize for my first post being a problem, been a lurker for quite some time.

So I recently rebuilt my PC in a new case with an SSD and H100i, got it up to date on updates, drivers, etc. and stable at default BIOS settings. One of my checks was to ensure that all RAM was usable, because I've had the 24GB (7.99GB Usable) problem before. Before rebuilding, I was overclocked at 3.63 stable as a table for months. Once I ensured everything was working well, I started to overclock it again. Got it easily back to the 3.63 I was at before, no problems. Pushed it a bit more, pushing the RAM (1600Mhz Vengeance) to about 1700Mhz. Booted up, started P95, and noticed that I was only at 8GB of RAM. Did the typical checks (reseat RAM, check every stick individually, check MSCONFIG, reset CMOS) and it appears to be randomly jumping between 7.99GB and 16.00GB usable RAM. I'm now back on stock settings, and it says 16.00GB usable. Anyone seen this before and/or have any suggestions?

Specs:
EVGA X58 Classified Board (759)
Intel i7 940 (Bloomfield)
Corsair H100i
6x4GB Corsair Vengeance DDR3 1600 RAM
Sapphire Radeon HD 4850x2
OCZ Vertex 4 256GB SSD
Windows 7 Ultimate 64bit

As I said, it was working with all 24GB of RAM about an hour ago.
post #2 of 4
How random exactly is it? Does it change when rebooting without changing any settings?
If not, you may simply be using settings either the memory or IMC can't handle. I've seen this happen on my Dominators and Samsung sticks. There seems to be a certain threshold where if I increase frequency just a notch (or tighten timings a bit), the system will boot but I won't have access to all installed memory. I usually loosen up timings slightly to correct it, not sure if a voltage bump would help.
If it is totally random though, I'm not sure what the cause is. It might still be worth changing timings one by one to see if that makes a difference.
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Beestje 2.0
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Beestje 1.5
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CPUMotherboardGraphicsGraphics
Intel Core i7 3820 Sabertooth X79 ASUS GeForce GTX 680 ASUS GeForce GTX 680 
RAMHard DriveHard DriveHard Drive
Samsung low profile x4 OCZ Vertex 3 Crucial M4 Samsung HD103SJ 
Optical DriveCoolingCoolingOS
Lite-On BD drive Megahalems rev. B Cooler Master Excalibur Windows 7 home premium x64 
MonitorKeyboardPowerCase
ASUS VG278H Logitech G710+ Corsair TX750 Silverstone Raven 2 Evolution 
MouseMouse PadAudioAudio
Corsair M60 Razer Kabuto Echo Audiofire 2 Sennheiser HD515 
CPUMotherboardGraphicsRAM
i7 920 Asus P6T Club3d HD7870 royalKing Corsair Dominator 3x4GB 
Hard DriveHard DriveOptical DriveCooling
Crucial V4 128GB Seagate Barracuda LP 2TB LG GH22LS Scythe Mugen 2b 
CoolingCoolingMonitorKeyboard
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post #3 of 4
The only time I've had RAM disappear was when I overclocked it slightly too far, or I damaged the traces on the motherboard. Check your VTT/QPI voltage, RAM timings and QPI frequency/multiplier are properly set.

- If you think it's a Windows issue, you can see the total memory installed in the BIOS (24GB is about 25165824 K).
- If you think it's a RAM issue, you can test each stick individually (sounds like you've already done this).
- If you think it's a Motherboard issue, test the DIMM slots (see your motherboard manual for supported RAM configurations).
- If you're 100% positive your settings are correct, then maybe try flashing an older/newer BIOS.
     
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CPUMotherboardGraphicsRAM
i7 5960X 4.6GHz at 1.2V  Asus X99 Deluxe Evga 980 Ti SC+ Corsair Dominator Platinum 16GB at 2666 MHz 16-... 
Hard DriveCoolingOSMonitor
Samsung 950 Pro 256GB EK Supremacy EVO, EK Titan X Full Cover, EK X99... Windows 10 Home retail Acer Predator XB270HU 
PowerCase
Seasonic SS-760XP2 Corsair Air 540 White 
CPUMotherboardGraphicsRAM
AMD FX-8350 5GHz at 1.524v ASUS Crosshair V Formula-Z Sapphire R9 290X with EK water block 2x4GB G.Skill Trident X 2500MHz 9-11-11 1.68v  
Hard DriveCoolingOSMonitor
Samsung 850 Pro 256GB + 2x Seagate 3TB HDDs Koolance CPU-380A water block Windows 7 64-bit Home Premium BenQ XL2720Z 
PowerCase
Seasonic X 650 Gold Lian Li PC-T60B test bench 
CPUMotherboardGraphicsRAM
i7 2600K 4.4ghz @ 1.296v Asus Maximus IV Gene-Z XFX HD6950 shaders unlocked G.Skill ECO 2x2GB 1866MHz 7-9-7-25-1T @ 1.5v 
Hard DriveCoolingOSMonitor
Crucial M4 64GB + WD Black 1.5TB Apogee XT + MCP320 + MCP655-B Windows 7 x64 Home Premium + Linux Mint Debian 3x AOC 27" IPS monitors for 5760x1080 eyefinity 
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post #4 of 4
Thread Starter 
Sorry for the delay... Tried reseating the RAM again and trying individual sticks... I'm not sure if its the mobo or the sticks, but two sticks didn't work in slot one when I tried them. However, after cycling through all the other sticks, I tried the two that failed again and they both worked. I now am back to 24GB usable RAM. Thanks for the help!
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