Asus P7P55D and Corsair Vengeance 2x4GB: freezing

Recently, I bought this RAM from Corsair to upgrade/raplace my old one:

New one:

Corsair Vengeance 2x4GB, 1600MHZ, 7-8-8-24, 1.5V

Old one:

Kingston ValueRAM 2x2GB, 1333MHZ, 9-9-9-24, 1.5V

When I was runing my old RAM, all was working fine (no freezing, no boot problem, no crash, etc.). When I ran my new one for the first time, everything was good also (all booted normally, I could run it at the settings above with XMP Profile, etc.) but it began to freeze after an hour or two (nothing is moving, I only have a static picture of what I was doing). So, I had to force reboot. That's how it's started.

Here is what I tried from now after a tons of reading:

1- Set the DRAM frequency and DRAM timing manually (instead of using XMP Profile).
2- Increase the IMC Voltage (from 1,106V to 1,250V) and DRAM Voltage (from 1,546V to 1,600V).
3- Switch sticks side.
4- Test each stick and both together using different settings (Auto (1333 mhz, 9-9-9-24) and Manual (1600 mhz, 7-8-8-24)) with Memtest86+ (on boot CD and on Windows).
5- Stress test my system (CPU and RAM) with Prime95 and HyperPi.


1- Changed nothing.
2- Changed nothing.
3- Sometimes, it freeze and I am not able to reboot: the red DRAM led is alight. So, I press the MemOk! button (sometimes it takes several times) and it downclocks my DRAM frequency to 800 mhz, my DRAM timing to 9-9-9-24 and it only give me 4GB usable on 8GB. When I switch sticks side, I can now use 8GB (like before) but it is not solving the freezing problem.
4- When I test one stick at a time, I can pass the test without any problem. But when I try with both, it freeze at +/-96%.
5. I can pass these tests without any problem.

Now, it is still freezing (even if I run them at 1333 mhz, 9-9-9-24). Also, sometimes it freeze and I am not able to reboot (like I said before). When I try to reboot, I get a black screen with no signal and the DRAM led lights up. So, I run MemOk! and like I said, sometimes it downclocks my frequency to 800 mhz and only let me use 4GB of 8GB. I tried everything and I don't know what to do now (with my old RAM all was working fine).

Here is my config:

-Asus P7P55D
-i7 860 (2.8GHZ, 8MB of cache)
-Corsair Vengeance 2x4GB (1600 mhz, 7-8-8-24)
-Asus EAH4870 1GB
-Seagate Barracuda 500GB (7200RPM, 32MB of cache)
-Western Digital Caviar Black 1TB (7200RPM, 64MB of cache)
-Seasonic 550w

P.S. The freezings happen very randomly (sometimes it is when I am playing and sometimes when it boots). If I can make an average, it freeze at least 2-3 times a day and it won't boot at least once a day.

Thanks for your help!
6 answers Last reply
More about asus p7p55d corsair vengeance 2x4gb freezing
  1. I also figured out that when MemOk! downclocks my DRAM frequency to 800 mhz and let me use only 4GB of 8GB, it does not crash.

    Thanks for your help!
  2. So the problem is when I use 8GB (that's why it freeze with both sticks in Memtest86). No one???
  3. Nevermind, I tried with one stick (I tried both) and it freezed also. So the problem is the fact that I am using denser sticks... No one?
  4. Ok I contacted Corsair and they told me to contact Asus. I contacted Asus and they told me to RMA. This is a real **** it will take an eternity because my motherboard is quite old, I will waste my time and money to ship it and I lost money for my new RAM too (that is not working with my board). HUGE ****
  5. My corsair works fine as 2x4gb as long I populate it i memory bank either A2+A1 or A1+B1, I've used 4x4gb for the longest time too but it'll random reboot/crash from time to time which is very anoying. Appearently this motherboard only supports upto 2x XMP modules at the sametime and 4gb max each channel. I was going to upgrade but cant really find any memorystick without XMP these days.
  6. Try with sticks in slots 1-3, set freq to 1600 and try timings at 8-8-8-24 (for now), DRAM voltage at 1.55 see if this does anything and let me know, also toss in what CPU and is it at stock or OCed and we'll go from there
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