DDR4 Memory issue with 5820k

[k2xblazer]

Hello,

I've oc'd my i7 5820k on a Asus X99 Deluxe board to 4.3ghz and it seems to be good and stable.

Now my ram (Corsair LPX 2800mhz) is running at 2133mhz, when I turn on the XMP profile and set the ram to it's 2800mhz speed it fails in Aida in minutes.. voltages and timings are correct.

I know that the XMP profile changes the cpu strap and bclk frequency and I've kept the ram at stock with these settings on to verify that the cpu is still stable with this and it is.

If I move the memory even a touch above 2133 the system becomes unstable.

Any ideas on this? Thanks

 

[razer26]

Hi,

I was able to push my 5820k to 4.65 GHz on 2 cores and 4.5 GHz on all cores. I use a ASUS x99 deluxe mobo, Corsair Vengeance LPX 3000 MHz CAS 15 kit (4x8GB) and a NZXT kraken x61. I left the RAM on XMP Auto mode, which changed my CPU strap to 125 MHz instead of 100 MHz, and I tuned the Base clock too just a little bit to squeeze the max out of my CPU with a target temp of 70 C under load.

2800 MHz is kinda unstable but 2666 and 3000 are more stable (based on some of the browsing I did before my build). Try one of those other XMP profiles and turn your CPU multiplier down a bit and try running AIDA64 again. It should work.

 

[k2xblazer]

Thanks the the reply.

My computer wouldn't boot with 2666 and I did try the 3000mhz profile shortly after the 2800mhz failed and sadly got the same result..

 

[razer26]

Thanks the the reply.

My computer wouldn't boot with 2666 and I did try the 3000mhz profile shortly after the 2800mhz failed and sadly got the same result..

Oh. Well when I tried overclocking, I did't have any issues. You can try overvolting the cpu and RAM and the system bus agent. I think you'll have a fair idea of the voltage and clock targets if you have a look at this guide by Linustechtips

https://www.youtube.com/watch?v=Nj4ixZE7EWo

 

[k2xblazer]

That's the guide I've been using.

Ram is currently at 2500mhz and seems somewhat stable..

I honestly don't know what else to try...

 

[CorsairJoseph]

@k2xblazer, have you tried running your CPU on stock first before enabling XMP? What I would try first is, go to your BIOS and load optimized default first then enable XMP (2800Mhz) and see if that will get your system stable. I think your CPU overclock settings @ 4.3 is a little too much for the MCH to handle on top of the DRAM freq at 2800Mhz.

Just a heads up, before you venture into this even further. Keep in mind that, standard speed for all DDR4, regardless of their XMP pre-sets, is 2133MHz. So anything beyond that speed will be a little tricky to get a stable system.

 

[1LiquidPC]

Try adjusting SA voltage, or increasing cache voltage a bit. Using RAM at 2800 and OCing is increasing load/stress on the IMC. May need extra voltage for these to compensate.

 

[k2xblazer]

@k2xblazer, have you tried running your CPU on stock first before enabling XMP? What I would try first is, go to your BIOS and load optimized default first then enable XMP (2800Mhz) and see if that will get your system stable. I think your CPU overclock settings @ 4.3 is a little too much for the MCH to handle on top of the DRAM freq at 2800Mhz.

Just a heads up, before you venture into this even further. Keep in mind that, standard speed for all DDR4, regardless of their XMP pre-sets, is 2133MHz. So anything beyond that speed will be a little tricky to get a stable system.

Thanks for the reply.

I loaded the optimized settings and enabled the XMP 2800 profile but just as before Aida fails in minutes.

@1LiquidPC,

If you're referring to system agent voltage, I did already tweak that to no effect.

Here's how it's currently running, ran Aida for 7 hours with no fails.

 

[CorsairJoseph]

Well if you already have the system stable at 4.3 Ghz with DRAM at 2500Mhz, personally, I think that's something I'd settle on, that's a pretty solid OC setting as it is . Plus, I don't think you'll notice a huge difference between 2800Mhz and 2500Mhz in real world application.

 

[1LiquidPC]

Also, it could be your CPU not liking the "straps". For my own 5820K, I can't get consistent POSTs on Cold Boot when OCing AND using 2800 or 3000 profile. I can run 3000 XMP at stock no OC though. Never tried stresstests on stock CPU settings though. In the end, I've settled on 2666 using 100 strap and tightened timings. My benchmarks/bandwidth numbers are higher at 2666 with manual adjustments than 3000 XMP profile using standard 1.35v(same as XMP)

 

[k2xblazer]

Well if you already have the system stable at 4.3 Ghz with DRAM at 2500Mhz, personally, I think that's something I'd settle on, that's a pretty solid OC setting as it is . Plus, I don't think you'll notice a huge difference between 2800Mhz and 2500Mhz in real world application.

Even though I ran Aida for 7 hours on those settings with no issues, I power on the system today for it to freeze in windows and after restarting I'm greeted with an "Overclocking failed" message at post which is pretty annoying to say the least..

:/

 

[CorsairJoseph]

Force the DRAM voltage to run at 1.35v by manually inputting it after XMP is enabled.

 

[k2xblazer]

Force the DRAM voltage to run at 1.35v by manually inputting it after XMP is enabled.

After enabling XMP I did verify that the voltage was at 1.35v when at 3000mhz.
When at 2800 the XMP profile gave it 1.2v.

 

[1LiquidPC]

What's your Cache speed & voltage set at? The increased demand on the IMC from the overclock could mean this voltage needs an increase as well.

 

[k2xblazer]

What's your Cache speed & voltage set at? The increased demand on the IMC from the overclock could mean this voltage needs an increase as well.

I haven't touched the cache speed yet so that's still at 3000mhz. Vcore is at 1.23.

 

[1LiquidPC]

Are you still at the 4.3Ghz/2500 Memory settings, or stock CPU and 2800 or 3000 XMP Profile? If you @ 4.3, 1.23 might be a little "light" on Vcore for stability. It's also possible that the IMC in your CPU isn't the greatest. As CorsairJoseph pointed out, anything over 2133 is OCing the IMC.

 

[k2xblazer]

Are you still at the 4.3Ghz/2500 Memory settings, or stock CPU and 2800 or 3000 XMP Profile? If you @ 4.3, 1.23 might be a little "light" on Vcore for stability. It's also possible that the IMC in your CPU isn't the greatest. As CorsairJoseph pointed out, anything over 2133 is OCing the IMC.

Thank you fellas for continuing to reply, I do appreciate your help!

I did back down to 2133 on the memory but stayed with 1.23v on cpu at 4.4ghz and to verify that it was stable I ran realbench/OCCT/XTU/Aida64 all for a couple of hours each.

Maybe the memory controller just wont budge.

I can't seem to get the 2800mhz profile stable even with the correct voltage and even with stock cpu settings and tweaking the system agent voltage.

The 3000mhz wont even allow me to get in to the bios, I have to press the "MemOk" button on the motherboard for it to post.

 

[1LiquidPC]

Given the testing you've I think your on the right track. Since you can run CPU no problem at 4.4Ghz and 2133 memory, and stock CPU settings you can't run memory stable at XMP, its looking like an IMC limitation. With that said, I'd just try to get max CPU frequency stable, get memory up to a frequency that is stable. Then, since 2800 and 3000 are a no go, tighten timings to compensate keeping at 1.35v DRAM voltage.