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Trouble OCing RAM to 2400MHz on Haswell

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Hey guys,

After 5 years I'm finally getting around to OCing my RAM to 2400MHz, but I'm having quite a bit of trouble. I've done some research and made adjustments accordingly, but have a few questions.

At default speeds and settings (1333Mhz and whatever the default timings are) I had to adjust the System Agent (henceforth SA) to 1.1v to get 32GB stable. For OCing, I've tried both XMP Profile 1 and Profile 2 (both of which use the same speeds, voltage, and timings, so I'm not sure the difference) and neither was stable. So I've made some adjustments.

I'm currently using the XMP Profile 2, which set the timings to 10-12-12-31, at 2400MHz, with 1.65v to the memory. "Stock" XMP Profile 2 was not stable (neither is Profile 1) using memtest or gaming.

I have since incrementally adjusted the memory to 1.71v, and the SA to 1.175v. When I stability test with memtest, the test always fails at Test 7 [Moving inversions, 32-bit pattern]. With everything I've read, SA @ 1.150v should be enough to get to 2400MHz, so I'm leary about adjusting that any higher, though I have read that supposedly up to 1.250v is safe. But I haven't seen any solid numbers on the max memory voltage that I can run...which is part of the point of this post.

I tried to upload the latest memtest report, but it seems that HTML files aren't allowed. I can try to sanitize it and upload as a txt if anyone wants to see it.

What do you guys think is the problem? Lack of SA voltage, memory voltage, or both?

What should my next step be?

How safe is it to keep pushing the voltages?

EDIT/UPDATE:
2200MHz w/ XMP Profile 2 (10-12-12-31) stable at DRAMv 1.665v, SAv @ 1.150,
 
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When I overclock RAM I tend to disable all other modifications so basically you're starting with a vanilla bios settings then I just let XMP handle it, & rebuild any other custom settings I might have had.

However if your ram timing is 1333 MHz stock I think that 2400 MHz is a bit ambitious . I'd say 1866mhz is a better goal and more realistic ime, since 2400 MHz is almost 100% over clock
 

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1333 to 2400 is a hell of a stretch, also 32gb at that speed is probly not going to happen , ram speed doesn't matter shoot for a more reasonable 2133
you got the voltage already pretty much red-lined
all I can suggest is 15 15 15 45 if it doesn't work at that its not going to work period
 
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I believe his kit's are rated for 2400 by looking at his system specs not 1333.

32GB is difficult to run at high frequencies, try 1.2-1.25V SA and see what that get's you but other than that your not going to be able to do much more.

It's not the memory that's limiting it it's the IMC so increasing VDIMM will not help any.

Maybe play around with the I/O voltages and RING voltage, they may help as well.
 
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hes already at 1.150 sa if its not working at that then odds are 2400 is just not going to happen on that chip
most haswell chips hit wall at 2133 @ 32GB
 
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I've been able to hold 2133 on my Haswell chips(1333stock) ,better ram speeds with less Cores(pentium anniversary specifically). My 4790 just holds 1866mhz, same with my Xeon. 2133 is nothing to scoff at, & its not like there will be any difference in perf anyway.
 

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What’s the reason for wanting faster RAM

Quad Channel RAM is very stressful on the IMC so 2400MHz might be a stretch. Try getting 1866MHz stable first and work up from there
 

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I can personally confirm that 2400 is extremely difficult to hit with all four slots used. 2133 is the sweet spot limit.
 
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It was a miracle for me to push to 2666 from 2400 on Haswell-E...

It is the odd multi ratio usually... and timings, timings and timings... the dynamic ones made on boot. And the ones and secondary tier too. (thus involving a crappy bios and actually the IMC is fine and capable)
 
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The difference in the XMP is probably 1T vs 2T.
Other than that I have nothing useful to add that hadn't already been posted.
 
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What’s the reason for wanting faster RAM

Quad Channel RAM is very stressful on the IMC so 2400MHz might be a stretch. Try getting 1866MHz stable first and work up from there
the platform is dual channel... no matter if 4 sticks are used...
 
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The difference in the XMP is probably 1T vs 2T.
Other than that I have nothing useful to add that hadn't already been posted.

Show us the AIDA64 SPD maybe? Your secondary tier must be different.
 
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i have been lucky with my motherboard pushing 4x8 ddr3 at xmp2 at 2400mhz but those kits are 2400mhz rated
i have vring at 1.150 and the same at system agent but also 2 digital something(cant remember iam at work now) at 1.100v

he should try xmp first and if it cant post he needs to loosen those mem timings
p.s.i think that cpu overvoltage has also a minor role there
 
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These are my settings just loading the XMP profile with 2x8gb sticks. If your RAM is rated for CL 10 timings that is impressive.

11-13-13-31-2T @ 1.65v
SA @ 1.09v
Analog IO@ 1.12
Digital IO @ 1.13

That seems to be all the relative voltages. I think it would be worth you dropping down to just two sticks just to test if its having all 4 DIMM's occupied that is causing you issues.
 
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When I overclock RAM I tend to disable all other modifications so basically you're starting with a vanilla bios settings then I just let XMP handle it, & rebuild any other custom settings I might have had.

This is exactly what I've done. Everything is set to default except what I modified for OCing the RAM.


1333 to 2400 is a hell of a stretch, also 32gb at that speed is probly not going to happen , ram speed doesn't matter shoot for a more reasonable 2133

I believe his kit's are rated for 2400 by looking at his system specs not 1333.

32GB is difficult to run at high frequencies, try 1.2-1.25V SA and see what that get's you but other than that your not going to be able to do much more.

It's not the memory that's limiting it it's the IMC so increasing VDIMM will not help any.

Maybe play around with the I/O voltages and RING voltage, they may help as well.

hes already at 1.150 sa if its not working at that then odds are 2400 is just not going to happen on that chip
most haswell chips hit wall at 2133 @ 32GB

My chips are rated at 2400MHz, that is correct. I was not aware of the 32GB "wall" at 2400MHz, so I'm really glad you three mentioned it. I'll shoot for 2133 for 100% stability.
I did try 1.2 SAv, but no change. I'm thinking that what I have might be stable enough for use, but I'll try gaming this weekend and see what happens.
I'll also play around with I/O and RING voltage, I hadn't read anywhere that those could help with RAM stability.


i have been lucky with my motherboard pushing 4x8 ddr3 at xmp2 at 2400mhz but those kits are 2400mhz rated
i have vring at 1.150 and the same at system agent but also 2 digital something(cant remember iam at work now) at 1.100v

Are the voltages you mention the I/O and RING voltages, mentioned above?


As I alluded to above, DRAMv @ 1.71v and SAv @ 1.2v seems to be mostly stable at 2400MHz, with only 1 error in 6 runs of memtest. I'll game with these settings this weekend and see what happens. If successful, I'll incrementally reduce the voltages and report back with what I find. If I can't get 100% stability by playing with I/O and RING voltages, I'll step down to 2133 and try finding stability at those settings (and of course, report my findings).

Thanks guys, you helped a bunch and gave me some new things to look at!

EDIT: 2200MHz stable, see orig post for settings
 
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I would try 1.25 vccsa and vccio voltages and 1.75v dram.

I run 2400CL9 but 32GB is going to be more difficult.

If it absolutely won't run, then try slower with nice tighter timings and it will be as good. Try 2133CL9 (and CL8 or CL7 if you are super lucky). All of these TridentXs are dual ranked highly binned Samsung wonder ram, and will generally respond the same up to 1.8v if necessary. Definitely try CR2 if CR1 fails.
 
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