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Do I have a crap i7 920 D0, please advice

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October 31, 2011 12:30:28 AM

Hi, all, since my last venture iv managed to get my i7 stable @ 3.8ghz with HT ON (Prime 95 24hrs). Unfortunatly I cannot for the life of me get it stable at 4ghz with HT OFF and all other features OFF, it needs a whole 1.4V :cry:  just to start running IBT before freezing or crashing. Iv seen others hitting 4ghz with just 1.275V and yes I know every chip/board etc is different but really, that far apart different in voltages?.
Do i really have a crap i7 920 D0???

Current Settings for 3.8 with HT ON
CPU - i7 920 D0
Board - Asus rampage II Extreme
Cooler - Corsair H50 Push/Pull
DDR 1451mhz (currently downclocked from 1600mhz) - corsair xms3 classic 8.8.8.24 1.65v,
Ratio - 21
BCLK - 181
CPU Voltage - 1.325 (prime unstable anything lower)
CPU Differential Amplitude - 800mV
CPU PLL - 1.88217
QPI/DRAM - 1.29375
IOH Voltage - 1.20616
ICH Voltage - 1.20616
Dram Voltage - 1.65681.

Any help and advice would be much much appreciated :)  .
Thanx in Advance.

More about : crap 920 advice

a c 93 à CPUs
October 31, 2011 12:54:51 AM

As you said not every chip is identical. CPUs are only tested up to their stock clock speeds. Anything above that involves a little bit of luck. Some CPUs can overclock higher than others with less voltage, it's just the luck of the draw. In any case 3.8GHz is not a bad overclock, do you really need more performance than that? If not, just be happy with the 3.8GHz and look at upgrading when that no longer suits your needs.
October 31, 2011 12:59:55 AM

Supernova1138 said:
As you said not every chip is identical. CPUs are only tested up to their stock clock speeds. Anything above that involves a little bit of luck. Some CPUs can overclock higher than others with less voltage, it's just the luck of the draw. In any case 3.8GHz is not a bad overclock, do you really need more performance than that? If not, just be happy with the 3.8GHz and look at upgrading when that no longer suits your needs.


Very true and yes im happy that i got a 2.66ghz chip to run at 3.8ghz :D  , its only a downside as i swapped this for my phenom 965 @ 4.0ghz rig due to reading ALOT of users on net stating the D0 chips easily overclock to 4ghz with no or little voltage increase but not this sucker lol :heink: 

Thanx for the taking the time to reply thou :sol: 
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a c 93 à CPUs
October 31, 2011 1:02:27 AM

It is still an upgrade, even if you only get up to 3.8GHz. A Bloomfield at 3.8GHz would still probably be a good 10 to 15% faster than a Phenom II at 4GHz.
October 31, 2011 1:06:34 AM

Actually im currently at 47 Gflops on IBT and with the amd rig was at 54Gflops. (honestly dont know what that means but only that higher is better from reading on ALOT on forums lol), but honestly thanks for taking the time in replying.
a c 102 à CPUs
October 31, 2011 1:18:08 AM

I agree! 3.8 GHz is a nice OC for the i7-920 DO - that is the exact CPU that I have and I am currently running at 3.82 GHz over the past 22 months.

At one time, I did take it up to 4 GHz, stable, while keeping the voltage at 1.275 volts. Then on second thoughts I backed it down to 3.82 GHz just to prolong life expectancy.

At 3.82 GHz, as I am typing this the temps are around 29 degrees C (1.275 V).
October 31, 2011 1:29:16 AM

Ubrales said:
I agree! 3.8 GHz is a nice OC for the i7-920 DO - that is the exact CPU that I have and I am currently running at 3.82 GHz over the past 22 months.

At one time, I did take it up to 4 GHz, stable, while keeping the voltage at 1.275 volts. Then on second thoughts I backed it down to 3.82 GHz just to prolong life expectancy.

At 3.82 GHz, as I am typing this the temps are around 29 degrees C (1.275 V).


Hi Ubrales, you have got an awesum chip there (jealous lol). Just a quick question, how did you manage to take it up to 4ghz at the same voltage as i need 1.325v just for the 3.8?. And also it wouldnt really matter if you left it at 4ghz as you are not increasing ANY voltage what-so-ever from your above post so you chip's life wouldn't degrade any faster.
a c 102 à CPUs
October 31, 2011 1:51:18 AM

blakmumba said:
Hi Ubrales, you have got an awesum chip there (jealous lol). Just a quick question, how did you manage to take it up to 4ghz at the same voltage as i need 1.325v just for the 3.8?. And also it wouldnt really matter if you left it at 4ghz as you are not increasing ANY voltage what-so-ever from your above post so you chip's life wouldn't degrade any faster.

Even though the voltage is not increased, there will be more computations at 4 GHz than at 3.82 GHz. This will result in an overall increase in power consumed and eventually in temps. - I am not referring to temps at any given time, but in the long run the average temp will increase. A 3 to 5 degrees rise in temps may slip past me, and I don't want to take risks. Besides, 3.82 GHz is a 43% overclock! Most guides suggest a 15% to 25% gain by OC.

I am using an inexpensive, average quality heatsink; the CM V8. I would have liked to have the Prolimatech Megahalems, but it wont clear my tall Corsair Dominator RAM which is underclocked t0 1452 MHz, not intentionally, but that is what it ended up at after the CPU OC. The RAM is rated at 1600 MHz, but I will not see any performance degradation at 1452 MHz.

What I did different was to polish (wrongly referred to as lapping) the base of the heatsink primarily to improve the flatness. I left the CPU heat spreader alone because I don't know the thermal expansion characteristics of the CPU (I don't care about the warranty going void by polishing). However, I do believe that a slight polishing of the CPU heat spreader just to knock off the high spots at the corners will help.

I checked the temps before polishing and after polishing the heatsink base. The after polishing temps were 5 to 8 degrees lower than the before temps. Also, overall, the CPU temps now are about 8 degrees higher than ambient temps. - I used Arctic Silver 5.
October 31, 2011 2:02:44 AM

Ubrales, do you think my voltages are ok or on the high side? thanx.
a c 102 à CPUs
October 31, 2011 2:12:53 AM

blakmumba said:
Ubrales, do you think my voltages are ok or on the high side? thanx.

In my opinion, 1.325 volts for 3.8 HGz OC is kinda high; especially for the DO chip. You should be able to hit 3.8 GHz with something like 1.275 volts; max 1.300 volts.

The RAM voltage is also above specs. - 1.650 volts max.

Try polishing the heatsink base and re-installing the CPU/heatsink. I have a write-up on that if you need it. May I know what the ambient temps are? (My ambient is 20 degs, and CPU 29 degs currently).
a c 102 à CPUs
October 31, 2011 2:22:56 AM

My CPU voltage is 1.270 and my RAM is at 1.590 volts (rated at 1.650 volts).
October 31, 2011 2:27:36 AM

I dont think its got nothing to do with the heatsink base (i hope lol) as it fails prime 95 with error codes that relate to increase in the vcore. My temps maxed out at 74 degrees on prime 24hr blend test with 1 silverstone green led fan that came with the case and since then I have reconfigured the corsair rad to 2 silverstone fans to push/pull. My ambient temps are usually around 18-20 degrees (uk winters a b***h) but today its resting at 20 degrees around the room and 23.5 around my pc (got 2 temp guages lol). re-ran intel burn test with 1.4v to the cpu and 1.35 to the qpi/dram to quick test 4ghz with HT On, ran maximum stress test with the push/pull config and maxed out at 69 degrees (only 5 runs so tried 10 and failed with error code to increase vcore so turned HT off and same so gave up and back to 3.8ghz). At the moment my highest core temp is resting at 38deg considering im downloading,typing and thats with HT On and also considering the high voltages im feeding to the cpu and then and extra 1.3v to the qpi/dram and 800mV amp diff.
I honestly believe i'v either got the worst i7 D0 or im doing something wrong which ive gone over for the past week (ask my fam lol) but cannot pin point.

Anything you could think off?
October 31, 2011 2:30:58 AM

im running my ram downclocked to 1451mhz at 1.65v and honestly i havent bothered lowering it at the mo due to being disappointed with the overclock (just being honest). And before anyone flames me, yes i am happy that ive managed to overclock it but considering i was running a phenom 965be at 4ghz with 54Gflops to i7 920 at 3.8 with only 47Gflops has dented my ego lol.
October 31, 2011 2:34:03 AM

regarding the ram, the asus board only lets you choose 1.54something and then 1.65681, not directly 1.65v
a c 102 à CPUs
October 31, 2011 2:35:33 AM

The i7-920 DO is a great CPU for overclocking! And no, you don't have a bad CPU; definitely not!

This is the guide I used for OC: http://www.tomshardware.com/forum/263043-29-1156-core-c...

Time to bite the bullet and redo the overclocking per the above guide. Make sure that you set the RAM multiplier to its LOWEST value when you start the overclocking.

BTW, my ambient room temp is 20 degrees C now; CPU 28 degs as I type this (I have other windows open too).
a c 102 à CPUs
October 31, 2011 2:39:06 AM

Are you doing this all night? Next Saturday is Guy Fawkes day!

Time for me to go to bed.
October 31, 2011 2:40:43 AM

quick question which has puzzled me. When you say set the ram multiplier to its lowest, how would i do that as the asus board does not give you that option?. Do you mean buy the speed? as in ddr 800mhz, 1333mhz?
October 31, 2011 2:42:39 AM

thanx for the help :) 
a c 102 à CPUs
October 31, 2011 11:33:12 AM

Yes I mean the speed which is clock X multiplier.

As you increase the CPU overclock, the RAM frequency will also increase. The two are tied together in the i7-920. And when you have achiever the desirable CPU overclock, you don't want the RAM frequency to be beyond the RAM capability. The RAM frequency is something like this "Memory frequency:182x8=1456MHz" - here he has set the multiplier to 8 which may be the lowest multiplier (ratio).

After the desired CPU OC is attained, check what the RAM frequency ended at. If the RAM is still way below the rated frequency, then raise the RAM multiplier from 8 to 10, and check what the RAM frequency is now at. If it is above the rated frequency (1600 MHz?) go back to the old setting of 8 as the multiplier.

In my trials, first when the CPU was at 3.82 GHz, as a result, my 1600 MHz RAM was also OCed to 1820 MHz. The system ran fine with this RAM overclock, but I didn't like the idea of OCing the RAM. The marginal benefits of doing so do not justify the headaches that might follow. At this point, I backed down to the old multiplier which in my instance was 8. This gave me a RAM frequency of 1452 MHz which is close enough to the rated 1600 MHz.

Here is a quote from Tom's OC Guide for the i7 CPU:


2) How to start?

1. Enter the BIOS by pressing Delete key during POST(Power On Self Test)/Boot Screen.

2. Set BCLK, CPU multiplier/ratio, QPI Clock multiplier/ratio and Memory multiplier/ratio so that you can achieve the frequencies you want.

Quote :

BCLK x CPU ratio = CPU frequency
BCLK x QPI ratio = QPI link speed -> set the ratio to the lowest possible value!
BCLK x Memory ratio = Memory frequency

My settings are:
CPU frequency: 180x20=3.6GHz
QPI link speed: 180x32=5.76GHz
Memory frequency:180x8=1440MHz

3. Manually set the memory timing according to the specification of your RAM, leaving everything unspecified as Auto.
(You have to set the DRAM Timing Selectable to Quick or Expert in order to do this in P55A-UD5!)

4. Disable the Turbo Boost Technology!

5. If it's impossible to get your system stable, disable C1E, C3/C6/C7 and EIST.

(C1E, C3/C6/C7 and EIST are power saving features and CPU will always run at highest clock when ALL of them are disabled.)

For i7-8xx CPUs, disable HT (Hyper Threading Technology) as well under this situation.


The detailed guide is here: http://www.tomshardware.com/forum/263043-29-1156-core-c...

Hope this helps.
October 31, 2011 12:15:01 PM

I got the same CPU I7 920 D0 @4.2 100% stable, VCORE 1.389 smth like that.
I could lower it but I really don't care, it doesn't make any difference even if it's at 1.4.
Cooling Mugen 2 Rev. B with Arctic Silver Ceramique
21x200 and 1600 for rams
October 31, 2011 12:15:06 PM

I got the same CPU I7 920 D0 @4.2 100% stable, VCORE 1.389 smth like that.
I could lower it but I really don't care, it doesn't make any difference even if it's at 1.4.
Cooling Mugen 2 Rev. B with Arctic Silver Ceramique
21x200 and 1600 for rams
October 31, 2011 12:20:54 PM

wow, i had i7 920 D0 and i was at 4.0Ghz with just 1.232volt!!!!! and load balancing on..I was extremely lucky then, on the other hand i had a very good motherboard too. Definitely i7-920 is superior to the phenom you describe, i had them both in one room , my wife's pc had that phenom and i had the i7 920.
Anyway, now i have the i5 2500k, running at about 4.3ghz at silly low temps, but the motherboard isn't that good , i am not happy with it. Performance is 20%ish higher than i7-920 @ 4ghz, but i was forced to upgrade anyway. (sold my i7 920 d0 at 200euro ^^ because of the oc potential)

I will say one thing, you need to pinch abit the qpi pll voltages, just a b it, i hope you dont have auto voltage at some settings. Load balancing On is VERY important, you will definitely get lower voltages on your cpu if you turn it on. However Gigabyte's Load Balancing is different from Asus's, so you will need to research on it.


i7-920 D0 is awesome cpu, you are maybe the first i see to cry about it, i am most certain there is a bad setting at your mobo, i even have the same H50 as yours at push/pull, It's really strange to have these 4.0ghz impossible barrier..
a c 102 à CPUs
October 31, 2011 12:34:55 PM

mcnumpty23 said:
you may need a little more qpi/dram voltage--i need 1.325v to get to 4.2ghz with 1.28v on the cpu

heres another good guide

http://www.clunk.org.uk/forums/overclocking/22106-core-...

Curious; what type (brand) of RAM are you using? I have Corsair Dominator set at 1.590 volts (rated max is 1.650 volts).
a b à CPUs
October 31, 2011 12:40:10 PM

Ubrales said:
Curious; what type (brand) of RAM are you using? I have Corsair Dominator set at 1.590 volts (rated max is 1.650 volts).


12gb of patriot viper low latency--rated for 8-8-8-24 but i have it at at 1.65v and 7-7-7-21 and 1t command rate

edit --1600mhz--memory multiplier 8 x 200mhz
!