Memory Timings

I have 4x8gb sticks of ram, and can't get 1600 mhz settings to stick. Meaning, once I reboot, all of the settings reset to default automatic. All sticks are rated for this speed. I have 3x8gb Gskill 1600mz, and one Corsair 8gb 1600mhz. Is that an issue when having max memory, and all dimm slots full?
Image after reboot

 

That's compatibility issue, it's recommended to use identical memory if you are going to overclock it.

 

So its considered overclocking, if you are trying to achieve the 1600mhz that the memory is rated for? As far as compatibility, it may be the fact
that I am using one Dimm, (Corsair) that is 1.5V, and three Gskill at 1.35v? I am going to pull that stick out, and try. Everything runs fine, and benches fine at 1600mhz, but once the pc is restarted it reverts back to default settings.

 

It might be the 1.5v corsair memory. The only other way to force the settings to stick would be with an unlocked BIOS that allows memory configuration.

 

Ya, I have an unlocked bios from Svet in the MSI forums. That is how I am able to adjust the timings. I will pull that 1.5v stick out and see if it stays on reboot.

 

Looking at your signature I see that you have a Haswell system.
Because 1.5V is not supported in Haswell system and after at all.

 

Really? I did not know that.

 

DDR3L is the only type of RAM supported, see below for official spec.
http://ark.intel.com/products/75128/Intel-Core-i7-4800MQ-Processor-6M-Cache-up-to-3_70-GHz

 

That does sound a little strange, if you can run at 800MHz successfully then one would think you should be able to reboot with those settings.

Are you setting most of the timing values in BIOS, not just the usual freq, CL-RCD-RP-RAS-RFC-CR? Have you tried loose timing to start with?

From my own testing I think the DDR3L requirement has more to do with most Laptops providing a fixed memory voltage of 1.35V more than anything else. IOW the supply isn't suitable for 1.5V operation in such cases.

 

Yes, doing all the settings in the BIOS. Instead of taking out the 1.5v stick only, I replaced it with a 1.35 kingston, I had in my laptop bag. Still the same results. Does not hold through reboot.
I am gonna snap some pics in the BIOS to make sure I am doing it correctly.

 

Here are some bios pics and the results in Windows.

 

On a desktop motherboard, this isn't an issue because both 1.35 & 1.5 are supported, but not the IMC (Integrated Memory Controller) on a mobile processor which doesn't supply voltage exceeding 1.35V. If it's a single module it may still work but when you have multiple modules then this is where the issue haunts you. This was known when Haswell platform first came out and many people submitted the issue on this forum.

Unless of course, MSI was able to come out with some kind of workaround.

 

@Raiderman try this 1.33-12-11-11-11-28-12-208-6-5-6-8-6240-24-39 for your settings on the right pic, are there no read and write delay timings?

@Kevin@GenTechPC the VDDQ supply is from the VRM on the mainboard. If you put 1.5V DIMM in a laptop which has a fixed 1.35V VRM then that's all it's going to get. I have run DDR3L at 1.35V and 2400MT/s using an i7-4600m and an i7-4700MQ. Increasing the same SODIMM to 1.5V allowed operation at 2800MT/s. I remember you have already seen a conformation screen shot of this.

2800MT/s ran without problem however there didn't appear to be any appreciable gain over 2200/2400. Some articles do seem to suggest 2400MT/s is the sweet spot for Haswell.

 

Gotcha, let's wait for Raiderman's confirmation.

 

Like I said, I pulled the 1.5v corsair out, and put in a Kingston 1.35v with the same results after reboot.
@Dufus I will try those timings right now, report back asap

 

Still the same result, I can boot and bench fine with those settings, but it resets after power cycle. One thing I do notice is, that there is a little "hang" once the screen goes black. Takes
a few more seconds to actually post. I am going to chalk it up to the one stick not being a matched stick. I will order another once Newegg gets them back in stock. On this model of MSI laptop, I have to
remove the gpu heatsink to change out dimm 1. Kind of a pain in the ass.

 

Raiderman, what's the PN on the memory module?

 

I will have to pull it, and check, I think its the stock 1600mhz Kingston stick that comes with this model. Newegg has the G Skill 8gb back in stock,
and I just ordered one. Now every module will be matched. Never had a problem like this on desktops before, not understanding why the reboot resets them to 1333, when all modules are 1600mhz?

 

Seems the BIOS is being strange. Hope it works out for you.

 

I might get in touch with Svet, and see if knows of something strange with the BIOS.

 

Can you flash it to the stock BIOS and verify?

 

Update: Received my other stick of G skill ram today. I popped it in and voila! 1600mhz default!
So, for everyone's knowledge, they must be matched dimms!

 

Good job, glad to know that the clock is finally ticking the way it's supposed to.