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Corsair Vengeance Performance Memory 2133MHz on Sabertooth X79 Default Speed 1333Mhz

post #1 of 4
Thread Starter 
It's been a *long* time since I last built my own PC and perhaps I've run into a few snags because of that but if someone can point me in the right direction that'd be great. Here's my core specs:

Asus Sabertooth X79 Mobo (2011)
Intel i7-3930K @ 3.2Ghz
Corsair Vengeance Performance Memory Modules 16GB (2x8GB) DDR3 2133MHz Unbuffered CL10
Corsair H60 Liquid Cooler

The main issue I have is that the memory in the Bios is being reported as running at 1333Mhz. Much slower. If I try to set this to 2133Mhz, I don't even get past POST and hd to press the Mem Test button on the Motherboard.

Questions:

1. Is this memory not compatible at the marketed speed on this motherboard?
2. If not, am I likely to get it up close or should I try and swap it for another brand (I got 2 x 8GB as I eventually want to expand the memory to 64GB to incorporate some VMs)
3. If it is capable of running at full speed, should I be looking in the BIOS to change this or grab some windows tool and do it from the OS?
4. If I want to OC the CPU as well, will this affect what I do or what happens to the memory.
5. Side note, I am reading that the H60 not be enough to cool, especially if I overclock. Idle temp is 30-35 but worringly, the unit makes a rattling sound much like a failing HD so I may have to return it anyway. I have heard the H80 fan is bulky and could encroach over the DIMM modules on this board - any suggestions?

Thanks smile.gif

B
post #2 of 4
Do you set 2133 manually or via XMP? If XMP, try settings timings manually with tRCD of at least 300 (I've seen XMP mis-set this timing making things not possible to boot).
post #3 of 4
Thread Starter 
Hi Sam, thanks for your reply.

This is all done in the BIOS manually - haven't installed the OS yet. Would you recommend using XMP or CPU-Z once I've installed the OS to manage the memory speed? Or should this not be possible from within the BIOS?
post #4 of 4
Thread Starter 
OK, I've found the XMP setting in the BIOS and switched in On. Memory has now jumped to 1922.
Is this the default behaviour of memory these days - the marketed speed is the theorectical maximum and a lower stock speed is always selected for stability/ power consumption.
If I did want to tweak this higher, a) would this be recommended and b) best approach - bios tweaking or an easy-to-use tool in Windows. I'm not looking to max out my system but would like to have it running in a relatively fine tuned configuration.
I also noticed the CPU clock jumped to 3303Mhz - is this all connected to the XMP settings? CPU temp is idling right now at 33C and that doesn't seem too harsh. Will see what happend when I load on some load bearing software.
I've also noticed that the CPU frequency monitor that ASUS supply on the install disk shows the CPU frequency to jump between 1200 and 3900 Mhz - what is this exactly?
Sorry guys, a load questions and nothing to get excited about. Appreciate the sharing of you wisdom!
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