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Qpi/dram voltage?


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#1 Rockrtx

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Posted 19 April 2009 - 08:32 AM

Ok i overclocked my i7 920 to 3.2 and it pass prime95 for 1 hour test

Cpu ratio 20
Bclk frequency 160
cpu voltage 1.23750
Qpi link to lowest setting
My corsair 1600mhz is still running at 1600mhz (put 1333mhz value with OC came back yo 1600mhz )

Qpi/dram on auto

I keep reading on Qpi/dram voltage and can't have a straight answer.

What is the stock setting in bios for QPI?
What is the rule for this .5 volt difference of dram ( 1.65 )?

Is it safe to let it on auto?
OS Windows 7 64 bit
CPU i7 920 oc to 3.7
Cooling noctua nh-u12p
MOBO Asus p6t deluxe v2
RAM 6 GB corsair 1600 mhz
PSU Corsair HX620
GPU evga 9600 gt sc
HDD Samsung spinpoint f3
CASE CM 690

#2 Zertz

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Posted 19 April 2009 - 02:17 PM

Stock QPI voltage is 1.1 or 1.2V. I read it's recommended to keep DRAM and VTT voltage within 0.4V of eachother

I like tweaking voltages myself, because boards tend to set them a bit high when overclocking

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#3 ccokeman

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Posted 19 April 2009 - 02:21 PM

QPI voltage is the voltage for the memory controllerthat is on the CPU. You want to keep the memory controller voltage and memory voltage with in .5 volts to prevent damage to the CPU/IMC. THe highest I have run the memory voltage has been 1.75 but had the QPI at 1.45 to get the latencies I wanted to run.
Processor Intel Core I7 920 @ 3.6
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Motherboard MSI X58 Big Bang
Graphics ASUS GTX 580
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#4 Nuclear

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Posted 19 April 2009 - 03:23 PM

I never leave my QPI on auto because it tends to overvolt at lower speeds and never applies enough at higher speeds. My P6T Deluxe V2 sets the QPI to 1.375v on auto even when I'm running stock clocks, but only attempts to run 1.3875v at bclk of 200+. I've run my QPI at 1.5v for extended periods of time on all of my i7 systems and never had a problem, they're all stick ticking. I wouldn't recommend running it that high unless you have a very good water setup or better.

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#5 Rockrtx

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Posted 20 April 2009 - 04:03 AM

Thank for info guy's.

I finally get a stable result,ad to bump the QPI voltage to 1.3 to stay in windows and up to 1.35 to pass 1 hour of prime95.

But i made a bump to 1.3250 to 1.35 so maybe i could try lower to 1.34.

I read a lot of poeple are questioning these value and some say it not safe to run it that high or maybe motherboard manufacture set these default ( 1.2 ) too low.... because it take much more than that to get it post stable.

Is it safe to run those voltage 24/7 on QPI because my number is in purple on my mobo?

What is your setting on QPI voltage?
OS Windows 7 64 bit
CPU i7 920 oc to 3.7
Cooling noctua nh-u12p
MOBO Asus p6t deluxe v2
RAM 6 GB corsair 1600 mhz
PSU Corsair HX620
GPU evga 9600 gt sc
HDD Samsung spinpoint f3
CASE CM 690

#6 Zertz

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Posted 20 April 2009 - 04:24 AM

My daily runs with:
VCore: 1V
VDIMM: 1.55V
QPI: 1.1

With power saving stuff enabled..

Overclocking is another story though :P

VCore up to 1.5V, VDIMM 1.7, QPI 1.5V... I wouldn't run that 24/7 though

Some people are like slinkies - not really good for anything but they bring a smile to your face when you push them down the stairs.


#7 Rockrtx

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Posted 20 April 2009 - 04:29 AM

Zertz

How can you run QPI/Dram at 1.1 volt?

My p6t don't go lower than 1.2 volt on manual setting?
OS Windows 7 64 bit
CPU i7 920 oc to 3.7
Cooling noctua nh-u12p
MOBO Asus p6t deluxe v2
RAM 6 GB corsair 1600 mhz
PSU Corsair HX620
GPU evga 9600 gt sc
HDD Samsung spinpoint f3
CASE CM 690

#8 Nuclear

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Posted 20 April 2009 - 06:01 AM

Intel's safe range for QPI on the i7 is 1.35v, so you will be perfectly fine running that voltage 24/7 if you wish. I wouldn't hesitate to run up to ~1.38v 24/7 if proper cooling is being used.

| Arctic Assault |
| i5-2500k @ 5.0GHz | Gigabyte GA-P67A-UD4 | 4GB GSkill Ripjaws X @ 2133 | 2 Sapphire HD6970 | OCZ Vertex 3 240GB SSD | Corsair HX1000 | CM 690 II-A |
| Kept Cool and Silent |

| Others |
| 990X | 1090T | 2600k | 555 | 13" MBP |


#9 Rockrtx

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Posted 20 April 2009 - 12:45 PM

What is the max CPU overclock i can make for 24/7 use? 3.3mhz 3.4? with 1.25 on the vcore?

By the way i have lower my QPI/dram voltage to 1.33750 and it is stable at 3.2.

Edited by Rockrtx, 20 April 2009 - 01:44 PM.

OS Windows 7 64 bit
CPU i7 920 oc to 3.7
Cooling noctua nh-u12p
MOBO Asus p6t deluxe v2
RAM 6 GB corsair 1600 mhz
PSU Corsair HX620
GPU evga 9600 gt sc
HDD Samsung spinpoint f3
CASE CM 690

#10 Zertz

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Posted 20 April 2009 - 07:25 PM

Zertz

How can you run QPI/Dram at 1.1 volt?

My p6t don't go lower than 1.2 volt on manual setting?


Depends on boards actually. I use the EVGA as a daily, but the Asus I think starts at 1.2V

You can easily hit 3.2GHz with minimal increases, if any, on voltages. Can,t really tell a max overclock as that depends a lot on your CPU. For 24/7 use, you will be temperature limited more than anything. What heatsink are you running?

I would be comfortable to run up to 1.35V daily, even 1.4V assuming proper cooling

Edited by Zertz, 20 April 2009 - 07:26 PM.

Some people are like slinkies - not really good for anything but they bring a smile to your face when you push them down the stairs.


#11 ccokeman

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Posted 20 April 2009 - 08:06 PM

On 1.25 it really depends on how well your chip can run at that voltage. I have seen screen shots of 4.0 but stable at that speed is another thing. I can boot into windows at 1.31 on one of my 920s but it takkes 1.375 to be stable at 4.0 and 1.40 to be stable at 4.1. The board flakes out over a 215 baseclock so far. will have to ge better cooling on the mosfets and NB to go higher methinks. I run 1.40 on the core, 1.475 on the QPI and 1.65 on the memory right now and all the parts are happily working....Still. Oh its under water as well.
Processor Intel Core I7 920 @ 3.6
Memory Mushkin 998995 Blackline 12GB 9-9-9-24
Motherboard MSI X58 Big Bang
Graphics ASUS GTX 580
Power Corsair AX 1200,
Monitor Gateway UXD3000, LG W3000H, ASUS VG236 x 3
Water Cooling By DangerDen & Swiftech
Follow OCC on Posted Image

#12 Praz

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Posted 21 April 2009 - 04:19 AM

What is the max CPU overclock i can make for 24/7 use? 3.3mhz 3.4? with 1.25 on the vcore?

The voltage required will also depend on the amount of memory installed , its speed and CAS setting. I have one 920 that runs 200x20 with the memory at 1600MHz at 1.26V. But with the memory at 2000MHz the CPU requires 1.32V.