Overclock.net › Forums › Components › Memory › 16 GB RAM upgrade issue
New Posts  All Forums:Forum Nav:

16 GB RAM upgrade issue

post #1 of 8
Thread Starter 
My original system was 8 GB (4x2) Corsair vengeance ram on my 990fx with a phenom II. i recently bought 2 more 4 GB sticks (the same as the first two) and installed it in my system. the first boot up failed, and the second time windows( 7 home premium x64) showed only 12 GB usable, with 4 GB set to hardware reserved. Next time i tried to restart, i couldn't even get to the bios. after a couple more restarts, windows loaded up with only 8 GB usable, 8 GB hardware reserved. Not sure what the problem is, but input is appreciated.

specs:
ASUS 990fx crosshar V formula
4x4 GB corsair vengeance 1600 Mhz (black)
AMD Phenom II x6 1055t OC'd 3.612 Ghz
Edited by deadlysnowcone - 12/27/11 at 4:37pm
post #2 of 8
Once you have the sticks installed, go into the BIOS and ensure that all of the sticks are running at their proper timings and voltages.
post #3 of 8
Thread Starter 
Quote:
Originally Posted by E-Peen View Post

Once you have the sticks installed, go into the BIOS and ensure that all of the sticks are running at their proper timings and voltages.

from what i could tell the first time i looked at the bios, everything was set correctly. unfortunately, i rebooted the system and it said only 8 GB was usable, 8 GB hardware reserved. i switched the places if the sticks, and now i can't even get into the bios (system will turn on, no screen). im going to go back to square one, with just the original 2 sticks, and then go from there.
post #4 of 8
You purchased the same exact RAM, correct? There's a lot of different Vengeance models, you could have accidentally bought one with different timings?

Start > Computer (right click, properties). What does it say for installed memory?
post #5 of 8
Thread Starter 
Quote:
Originally Posted by E-Peen View Post

You purchased the same exact RAM, correct? There's a lot of different Vengeance models, you could have accidentally bought one with different timings?
Start > Computer (right click, properties). What does it say for installed memory?

Yes, they are the same exact RAM. I took everything out, and tried booting with nothing but the new RAM sticks. Nothing. i then put in the original sticks into the same slots, and the system loaded with no problems. I have concluded that either the RAM itself is faulty, or something got screwed up in the BIOS and it reset itself. Going to return the RAM to the store and try a different set tommorow.
post #6 of 8
Mixed DIMMs are not guaranteed to work, only matched, tested KITs. Corsair uses (8) different IC suppliers and the same model RAM can be produced from different ICs that may not be 100% compatible when mixed.

I'd run Memtest86+ on each DIMM individually then on the first set, then the second set, then on all four DIMMs to check for a bad DIMM or compatibility issues.
post #7 of 8
Quote:
Originally Posted by AMD4ME View Post

Mixed DIMMs are not guaranteed to work, only matched, tested KITs. Corsair uses (8) different IC suppliers and the same model RAM can be produced from different ICs that may not be 100% compatible when mixed.

Very informative, thank you for the shared knowledge smile.gif
post #8 of 8
Thread Starter 
Quote:
Originally Posted by AMD4ME View Post

Mixed DIMMs are not guaranteed to work, only matched, tested KITs. Corsair uses (8) different IC suppliers and the same model RAM can be produced from different ICs that may not be 100% compatible when mixed.
I'd run Memtest86+ on each DIMM individually then on the first set, then the second set, then on all four DIMMs to check for a bad DIMM or compatibility issues.

Just got back from exchanging my RAM, but thanks for that info. it may have been that it wasn't compatible, but the ones i just exchanged for are. i must be very luck ^.^

so yea, i exchanged my kit and got another pair, running at the full 16 GBs with no problems so far. thanks for the info! biggrin.gif
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Memory
Overclock.net › Forums › Components › Memory › 16 GB RAM upgrade issue