System failing to boot and not recognizing RAM after upgrading?

[exxoid]

Hello,

I have a EVGA X58 SLI Classified motherboard (ICH10R) and it was running with...

Corsair CM3X2G1600C8D PC3-10700H (667MHz) (3x2GB i7 kit)

I purchased another 3x2 kit..

G.SKILL F3-12800-CL9T-6GBNQ which is PC3-12800 DDR3-1600..

Once I installed this into the EVGA mobo, my system would fail to boot (reboot loop) and few times I got it to boot by tinkering with the BIOS and windows showed 12GB available but only 8 usable.

I assume the G.SKILL is definitely not compatible?

 

[Torn Mind]

You might need to manually set the timings.

Also, try booting with just the G.Skill RAM installed. Make sure to take ESD precautions(touch the metal case as much as possible) when handling hardware.

 

[exxoid]

How would I go about determining what to set my timings to?\

The X58 allows me to set them manually (lots of options for RAM settings), but I wouldn't even know where to start.

 

[exxoid]

Googling around... I see that..

G.SKILL KIT Timing 9-9-9-24
Corsair Vengance Kit Timing 8-8-8-24

Going with your suggestion, I would need to update BIOS and set timing to 9-9-9-24?

 

[Torn Mind]

EDIT: yeah, pretty much. I was still writing this post. haha

Change just the four values that are advertised on the RAM to that of the G.Skill. I myself don't know what those other values stand for, so don't change those unless some expert finds this thread.

RAM comes with four specified numbers on the package, like 9-9-9-24
Those numbers correspond to CL(CAS latency), tRCD(RAS to SAS delay), tRP(RAS Precharge), and tRAS(Active to Precharge delay). The G.SKill is rate for 9-9-9-24 while the Corsair Dominator is rated for 8-8-8-24.

If it works after that, then you could try to see if 8-8-8-24 is stable for you. If not, then just switch it back to the 9-9-9-24.

I got my info on those values from here: http://www.hardwaresecrets.com/article/Understanding-RAM-Timings/26/2