32 GB DDR3 memory with a 4930k

[mihapiha]

Hey guys.

I just want to make sure something, and thought I would ask first, before I spend too much time wasting my energy.

It's about my gaming rig. i decided to blow 250 Euro and buy myself another 16 GB kit from Corsair.

I have now two 16 GB DDR3-2400 MHz Dominator Platinum sets, therefore now total 8 sticks with 4 GB a piece. I have stability issue on 2400 MHz, I figure because my memory controller in the CPU can't handle that much.

On 2133 MHz with the stock XMP setting everything works fine though. So this is what I use now:



The question is: Does it make any sense to try to tweak in the bios/uefi to get 2400 MHz running, or should I be happy with 2133 MHz anyway?

In the signature there are more detailed specs on my gaming rig

 

[tinytomlogan]

Cache is what you need to tweak to get it running and maybe even a bit more vcore

 

[mihapiha]

Cache is what you need to tweak to get it running and maybe even a bit more vcore

I've been playing around, unable to make it stable 24/7. I can boot into Windows no problem even run a few benchmarks, but eventually I get a BSOD. But I am not fully sure what you mean by tweaking the Cache.

For the 2133 MHz I set the CPUVTT Voltage to 1.3V and the CPU VCCA Voltage to 1.3V too. Stock for the VCCA with XMP is 1.2V...

 

[Kaapstad]

I've been playing around, unable to make it stable 24/7. I can boot into Windows no problem even run a few benchmarks, but eventually I get a BSOD. But I am not fully sure what you mean by tweaking the Cache.

For the 2133 MHz I set the CPUVTT Voltage to 1.3V and the CPU VCCA Voltage to 1.3V too. Stock for the VCCA with XMP is 1.2V...

Those volts are too high and could damage your CPU, you don't really want to go over 1.2v and even try to get them even lower (I use 1.1v @2400mhz with 16gb).

Unless you really need 32gb of RAM your PC will run better with 16gb (4 x 4gb).

 

[mihapiha]

Those volts are too high and could damage your CPU, you don't really want to go over 1.2v and even try to get them even lower (I use 1.1v @2400mhz with 16gb).

Unless you really need 32gb of RAM your PC will run better with 16gb (4 x 4gb).

Thanks for the tip. I lowered it to 1.1V and I'll see if that is stable.

I bought the second 16 GB set to use a 20 GB RamDisk. It's pretty cool. So if I can keep them, I'd like to.

 

[mihapiha]

I still can't get the memory running well.



This is pretty much the best I can do, but for some reason the benchmarks indicate that I'm better of at 4.5 GHz with 2133 MHz. I don't know why I loose performance with 200 MHz more memory clock.

Maybe it's not fully stable

 

[mihapiha]

Ok, even more testing.

I need 1.4V (Bios)/ 1.43V (CPUz) VCore for 4.5 GHz.
At that voltage I can run my CPU under any load I want to, and it's rock stable. So I tested various DDR3-Ram frequencies and here are the final results:

2000 MHz is perfectly stable
2133 MHz is stable 99% of the time, I have to really stress the CPU for quite some time to run into any issues
2333 MHz is somewhat stable. Stress-Test failure after 5 minutes at the latest. (I still use Prime95 ... OCCT annoys me but I stress with it as well)
2400 MHz runs barely. I can benchmark with it but I run into issues pretty quickly (BSOD)

My question is now, since TTL mentioned I have to tweak the Cache, which setting in the bios/uefi are connected to the cache? If I knew I'd try to find more stable clocks, but I am somewhat confused with what I have to play with.

The P9X79E-WS motherboard's settings are endless.

Raising the VCore didn't help by the way. I increased to 1.45V (bios)/1.48V (CPUz) for some of the tests.

 

[mihapiha]

No aid?