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*Official* Intel DDR4 24/7 Memory Stability Thread - Page 196

post #1951 of 5462
Quote:
Originally Posted by Silent Scone View Post

From what you've told us so far, it doesn't even sound like you've attempted 1T. Whilst using XMP timings, a slight bump in DRAM voltage may be all that is required

I did attempt it and it was unstable at 1.35V, 1.0V SA, untouched VCCIO, I'll try again tonight incrementing .05V DRAM voltage up to 1.4ish. I'm not sure if I should go much higher than that, or what would you consider a safe voltage cap?
    
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post #1952 of 5462
Quote:
Originally Posted by DarkIdeals View Post

Ah, I see. That makes sense. I forget that Intels spec sheets almost always only factor in the JDEC verified speeds for that kinda stuff.
Yeah it's crazy. remember not so long ago the "experts" were saying that it would take DDR4 4266mhz or faster RAM to match ~DDR3 2133mhz C10 kits; but here we are slightly beating DDR3 2133 C10 with only DDR4 3200 C13-14 etc.. I think people overestimated how large the latencies would become on 3000mhz+ RAM speeds. At first even the 2133/2400mhz etc.. DDR4 was C15 or C16, so they probably figured 3200mhz DDR4 would be like C20 lol.

Really? Wow, I didn't follow the discussion as DDR4 was coming around. But, because of DDR4's relative immaturity, people post the most inane benches. I saw one review that thought it would be useful to bench these sticks:



How useful. 2133MHz C15 vs 3000MHz C15. I wonder, which one will be faster? I don't want to post the link to avoid shaming the reviewer, but come on, man.
Quote:
Originally Posted by Blameless View Post

DDR4 is typically a little faster at similar timings due to bank groups and some other enhancements.

I'm running 2667 CL12 and it kicks the snot out of the DDR3-2133 CL9 I was using with my SB-E/Ivy-E, even at lower uncore clocks...though some of that could be due to HW-E's memory controller. Though I don't personally have any desktop Skylake systems, tests with them show similar trends...DDR3 needs to be run tighter to match DDR4 at the same clocks.

Oh, nice. I had heard that about DDR4 (i.e., MHz / CL isn't 100% comparable between DDR generations), but I never knew why. Thanks for the heads up about "bank groups" -- I'm google'ing away now, haha.
Quote:
Originally Posted by Jpmboy View Post

this is what many folks don't get about tweaking ram to this level... it's not simply a failed post or boot, it can completely corrupt an OS install and even Bios. As you did... use an OS image that can be rebuilt easily. thumb.gif

I apologize for not reading the whole thread; I only got through the last 5 pages. But, "this level", you're talking about secondary and tertiary timings, correct? Poor peasants like me, who just mess around with primary timings, shouldn't necessarily be as worried, right?
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post #1953 of 5462
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Quote:
Originally Posted by vibraslap View Post

I did attempt it and it was unstable at 1.35V, 1.0V SA, untouched VCCIO, I'll try again tonight incrementing .05V DRAM voltage up to 1.4ish. I'm not sure if I should go much higher than that, or what would you consider a safe voltage cap?

Try up to 1.45v on DRAM. I'd missed the fact you were using 64GB.

1.0v VCCSA is slightly optimistic with that much memory. I would be trying between 1.1 - 1.15v
post #1954 of 5462
Quote:
Originally Posted by Silent Scone View Post

Try up to 1.45v on DRAM. I'd missed the fact you were using 64GB.

1.0v VCCSA is slightly optimistic with that much memory. I would be trying between 1.1 - 1.15v

Thanks, this is exactly the kind of information I needed. I'll try tonight after work and report back.

Thanks for your help!
    
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post #1955 of 5462
Quote:
Originally Posted by djgar View Post

Is there a reasonable explanation why my copies are always noticeably lower than reads / writes with my 6900K?

really need to see your complete timings...
Quote:
Originally Posted by vibraslap View Post

these posts from the Broadwell-e thread


This is the information I was going off of. But what is your experience? Will more VCCSA and VCCIO help get me stable on CR1? Loosening other timings? Any other settings? This rig is honestly my first attempt at overclocking so I'm extremely open to guidance.
My post relates to the 64GB kit I am using... 1T just hasn;t worked. 1T on a 32GB Ripjaw kit 3200c14, worked fine at 3400c14-14-14-1T with 1.45V.
So.. I run the 64GB kit at 3400 c14-14-14-32-2T and it is plenty fast.
Quote:
Originally Posted by Silent Scone View Post

Try up to 1.45v on DRAM. I'd missed the fact you were using 64GB.

1.0v VCCSA is slightly optimistic with that much memory. I would be trying between 1.1 - 1.15v

I second this. Seems that the b-die based 8GB sticks come alive at 1.45V. thumb.gif
Quote:
Originally Posted by ikjadoon View Post

Really? Wow, I didn't follow the discussion as DDR4 was coming around. But, because of DDR4's relative immaturity, people post the most inane benches. I saw one review that thought it would be useful to bench these sticks:



How useful. 2133MHz C15 vs 3000MHz C15. I wonder, which one will be faster? I don't want to post the link to avoid shaming the reviewer, but come on, man.
Oh, nice. I had heard that about DDR4 (i.e., MHz / CL isn't 100% comparable between DDR generations), but I never knew why. Thanks for the heads up about "bank groups" -- I'm google'ing away now, haha.
I apologize for not reading the whole thread; I only got through the last 5 pages. But, "this level", you're talking about secondary and tertiary timings, correct? Poor peasants like me, who just mess around with primary timings, shouldn't necessarily be as worried, right?
well... you can completely bork an OS install without ever touching secondary timings. Depends on how far off the reservation you take the pony. wink.gif
Edited by Jpmboy - 7/12/16 at 9:38am
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post #1956 of 5462
Quote:
Originally Posted by Jpmboy View Post

really need to see your complete timings...

Strictly the mains: 14-15-14-34-CR1 - everything else in auto. DRAM current @ 130%. SVID disabled, power phase std, training enabled.

Thanks!
post #1957 of 5462
Quote:
Originally Posted by Jpmboy View Post

I second this. Seems that the b-die based 8GB sticks come alive at 1.45V. thumb.gif

I'm using 4x 16gb sticks if that makes a difference.
    
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post #1958 of 5462
Thread Starter 
Quote:
Originally Posted by vibraslap View Post

I'm using 4x 16gb sticks if that makes a difference.

I'd be happy with what you are running now.
post #1959 of 5462
Quote:
Originally Posted by Silent Scone View Post

I'd be happy with what you are running now.


Can you go into more detail as to why?
    
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post #1960 of 5462
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Quote:
Originally Posted by vibraslap View Post

Can you go into more detail as to why?


Because 4x16GB at that speed with a command rate of 1 is not easy on anything, hence my answer - I'd be happy with achieving what you have.
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