Crucial Sport VLP OC advice needed

[Cy4n1d3]

Hey,

I really appreciate the information you share with us in here 8 Pack!
Got some very useful information regarding memory overclocking from all those threads

My specs:
CPU: Intel Core i5-2500K
RAM: Crucial Ballistix Sport VLP (16GB DDR3-1600 @ CL9-9-9-24, 1.35v)
GPU: MSI R7950 TF 3 (7970 PCB)
Board: ASUS Sabertooth P67
PSU: Sea Sonic G-Series G-550

I've been overclocking my computers' parts since I've built the first rig myself and I am running my good old 2500k and my HD7950 overclocked and watercooled and have no problem tweaking those various voltages and board settings. I do know the basics of memory overclocking but I'm kinda stuck here:
I have the sticks running at 2133@11-12-12-30-1T single channel but can't manage to get 1T running with both sticks installed. Doesn't seem to matter if I change VCCIO, VDIMM or VCORE, 1T just doesn't want to run with both sticks installed, at least at 2133!
This is freaking me out, as I don't want to accept it's the IMC not able to run two sticks at 2133@1T...

Stick #1 @ 2133 single

I can run this one on 10-11-11-28 as well without too much volts, seems to be the better one.

Stick #2 @ 2133 single


I already made sure that my board is not setting strange timings when inserting the second stick using Memtweakit:


Short Linx runs to verify lower frequencies:
1600 (XMP):

1866 (manual)


I ran memtest from an usb stick using tests 2 and 5 each 10x to quickly check the stability and found 2133@11-12-12-30-1T to be stable on each of my mem sticks on its own (single channel) but as soon as I plug the second one in test 5 starts to throw errors at my face
Doesn't matter which slots I use, both VDIMM_A1/_B1 and VDIMM_A2/_B2 work equally good (or bad).
You can see my 24/7 VCCIO/VCCSA settings at the last screenshots.

Any hints on why I'm unable to get 2133@1T stable while using two sticks?
I was thinking getting 5.4 GHz prime stable was a hell of work, but this is just driving me mad lol


Thanks for reading and regards!

 

[8 Pack]

This may be a memory controller issue mate P67 and SB where never that good with 1T at high relative frequency's without the very best clocking dimms.

VCCSA is low, 1v is the default and should not be moved below. VCCIO I would try 1.1 to 1.125 these get my PSC stable on SB at Cas 6 2133mhz (6-11-7-24 1T)

 

[Cy4n1d3]

Thanks for your input

I did some testing today and recorded my results, will continue later.
VCCSA of 0.925v is stock on my board/cpu, I'm running 0.9375v most of the time.
A combination of VCCIO around 1.1v and VCCSA 0.9375v allows me to run memtest #5 for about 15 minutes before errors occur, if I increase VCCSA to 0.975v it errors out after 7-8 mins. I did increase VDIMM from 1.5v to 1.63125v, which gave me a slight boost in time until memtest craps out.

I will fiddle around a bit more tomorrow, don't have much spare time today (sadly).

Again, thanks for your insight mate

 

[8 Pack]

Often with these clocks there is a sweet spot keep testing and I recon you can get this stable.