BSOD 101 Tight RAM Timings - Page 5 - Overclock.net

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post #41 of 63 Old 04-19-2013, 09:43 AM - Thread Starter
 
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Do you recommend 1.74V to be the maximum 24/7 DRAM voltage? Can I increase it up to that to reach 2133MHz?

Also, at 1.72V tightening the tertiary timings to 1-1-1-1-4-4-1-4-4 won't let my system boot.

Here is my Maxxmem test:



Is 44ns latency alright for these timing set already?

Given all this? What should I do?

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post #42 of 63 Old 04-20-2013, 10:04 AM
 
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You may be facing a latency limit with the voltage you are using. Your bandwidth results are strong for 1866mhz though. Going to 2133mhz may net a small increase in bandwidth and another small drop in latency..

*if you want to keep volts where they are.. I would see if 9-10-9-27 will boot with all other timings the same; for 2133mhz. You may need to loosen trrd and trp too if you start having errors.


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post #43 of 63 Old 04-20-2013, 05:19 PM - Thread Starter
 
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Quote:
Originally Posted by CL3P20 View Post

You may be facing a latency limit with the voltage you are using. Your bandwidth results are strong for 1866mhz though. Going to 2133mhz may net a small increase in bandwidth and another small drop in latency..

*if you want to keep volts where they are.. I would see if 9-10-9-27 will boot with all other timings the same; for 2133mhz. You may need to loosen trrd and trp too if you start having errors.

Actually, increasing to 2133MHz gave me a really good increase in my benchmark results. I've already tried this with 2133MHz but they all failed (I can boot the system with them though):

9-10-9-28-2 - failed SuperPi
9-11-9-28-2 - failed HyperPi
9-11-8-28-2 - BSOD IRQ not equal etc. etc.
9-11-9-28-2 - failed IBT at pass6
10-11-10-28-2 - failed SuperPi
11-11-11-28-2 - failed SuperPi

This means that my system can't handle 2133MHz at that voltage, right?

Do you think 1.74V is a safe max 24/7 voltage? I won't hesitate to increase it to that much voltage as long as I know it is safe. My ambient temp is ranging from 30~33C though so that may be a thing to consider.

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post #44 of 63 Old 04-20-2013, 07:58 PM
 
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if you have some fan or good airflow on your mems it should be fine.. PSC can definitely handle the voltage.. you just dont want things to get too hot with 4x sticks and high ambient ... I would be comfortable running up to 1.74v on PSC for daily no problem. smile.gif

 

Q- when you tested timing ranges at 2133mhz did you 'Auto' your other RAM timings while moving only the primary timings?



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post #45 of 63 Old 04-20-2013, 08:15 PM - Thread Starter
 
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Quote:
Originally Posted by CL3P20 View Post

if you have some fan or good airflow on your mems it should be fine.. PSC can definitely handle the voltage.. you just dont want things to get too hot with 4x sticks and high ambient ... I would be comfortable running up to 1.74v on PSC for daily no problem. smile.gif


Q- when you tested timing ranges at 2133mhz did you 'Auto' your other RAM timings while moving only the primary timings?

Oh ok then. I do have great case airflow and fan blowing towards the RAM modules so no worries on that. Is 1.74V your max recommendation though? No higher than that, right? And wouldn't that present any degradation to the Sandy Bridge CPU's (2500K) IMC?

When I tested 2133MHz, these were the secondary and tertiary timings:

DRAM RAS# to RAS# Delay=4
DRAM REF Cycle Time=96
DRAM Refresh Interval=auto
DRAM WRITE Recovery Time=16
DRAM READ to PRE Time=4
DRAM FOUR ACT WIN Time=24
DRAM WRITE to READ Delay=4
DRAM CKE Minimum Pulse Width=auto
DRAM CAS# Write Latency=8
DRAM RTL(CHA)=auto
DRAM RTL(CHB)=auto

tWRDR(DD)=1
tRWDR(DD)=3
tRWSR=3
tRR(DD)=3
tRR(DR)=4
tRRSR=4
tWW(DD)=3
tWW(DR)=4
tWWSR=4

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post #46 of 63 Old 04-21-2013, 03:15 AM
 
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1.75v for only 4 sticks of ram, i'd be trying for around 1.65 zone.

You should only need higher for 8 sticks of ram, even the DDR3-3000 modules are only 1.65v.

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post #47 of 63 Old 04-21-2013, 03:44 AM - Thread Starter
 
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Quote:
Originally Posted by GunnzAkimbo View Post

1.75v for only 4 sticks of ram, i'd be trying for around 1.65 zone.

You should only need higher for 8 sticks of ram, even the DDR3-3000 modules are only 1.65v.

Well, that is without overclocking. What I'm trying to aim here is to have the maximum overclock of the modules with the least amount of voltage but I won't have problems increasing the voltage up to a maximum value as long as it is safe.

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post #48 of 63 Old 04-22-2013, 09:15 AM - Thread Starter
 
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BUMP!

I tried 8-11-8-28-2T and secondary/tertiary timings all an Auto at 2133MHz and 1.73475V VDIMM. It seems to be stable at that (passed IBT, HyperPi, and SuperPi but is currently on HCI Design Memtest).

What would be my next step in tightening the timings?

Thanks.

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post #49 of 63 Old 04-22-2013, 09:58 AM
 
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Good work! Now just try to tighten down the important timings in your secondary set:

 

DRAM RAS# to RAS# Delay=4 or 5
DRAM REF Cycle Time=96 or lower

DRAM Refresh Interval=auto
DRAM WRITE Recovery Time= 8 - 10
DRAM READ to PRE Time=4 or 5
DRAM FOUR ACT WIN Time= Auto
DRAM WRITE to READ Delay= 4 - 6
DRAM CKE Minimum Pulse Width= 5-7
DRAM CAS# Write Latency= 6 or 7
 

for tertiary.. just set tRRSR and tWWSR to 4 and leave the rest on 'Auto'



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post #50 of 63 Old 04-22-2013, 06:14 PM - Thread Starter
 
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Quote:
Originally Posted by CL3P20 View Post

Good work! Now just try to tighten down the important timings in your secondary set:

DRAM RAS# to RAS# Delay=4 or 5


DRAM REF Cycle Time=96 or lower


DRAM Refresh Interval=auto


DRAM WRITE Recovery Time= 8 - 10


DRAM READ to PRE Time=4 or 5


DRAM FOUR ACT WIN Time= Auto


DRAM WRITE to READ Delay= 4 - 6


DRAM CKE Minimum Pulse Width= 5-7


DRAM CAS# Write Latency= 6 or 7



 
for tertiary.. just set tRRSR and tWWSR to 4 and leave the rest on 'Auto'

Thanks! Will try those.

Would it be better to still tighten trp and tras?

Also, does the secondary and tertiary timings affect the capability of the primaries?

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