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Old 01-09-2009, 04:01 AM   #1
NeO
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Trying to reach 3.6GHz on i7 920 C0

Hi guys, it's been a long time since i asked help here and so far system is working really nice.

I alsways read this forum, tryin' to learn somethin' new and be less-noobish

I've finished my holidays so i'm back and since temps here are getting lower, i'm tryin' to push my 920 frequencies a lil' bit further.

Right now i'm rock-solid at 3.2GHz (tested with 6+ hours of prime95 and 6+ hours of memtest) and i'm getting awesome in-game performances and a fully stable machine (i use Inventor and Solid Works so my target are good speed, good temps and good stability).

My cpu is a 920 C0 stepping and my batch number is 3839A*** (sorry i can't remember the full number).

Here's my bios settings:

Genie BIOS Setting

CPU Feature
Set VR Current Limit Max: Disabled
Thermal Management Control: Disabled
EIST Function: Disabled
CxE Function: Disabled
Execute Disable Bit: Disabled
Virtualization Technology: Disabled
TDC Enable: Disabled
x TDC Limit: 0
TDP Enable: Disabled
x TDP Limit: 0

***** Logical Processor Setting *****
Intel HT Technology: Enabled
Active Processor Cores: All

DRAM Timing
Channel Interleave Setting: AUTO
Rank Interleave Setting: AUTO
Memory LowGap: 1536M

DRAM Command Rate: 2N
CAS Latency Time (tCL): 8
RAS# to CAS# Delay (tRCD): 8
RAS# Precharge (tRP): 8
Precharge Delay (tRAS): 24
REF to ACT Delay (tRFC): AUTO
Write to PRE Delay (tWR): AUTO
Rank Write to Read (tWTR): AUTO
ACT to ACT Delay (tRRD): AUTO
Row Cycle Time (tRC): AUTO
Read CAS# Precharge (tRTP): AUTO
Four ACT WIN Time (tFAW): AUTO

Voltage Setting
O.C. Shut Down Free: Enable O.C.S.D.F
CPU VID Control: 1.168750v
CPU VID Special Add Limit: Enabled
CPU VID Special Add: Auto
Vcore Droop Control: Enabled
DRAM Bus Voltage: 1.650v
DRAM PWM Switch Frequency: Nominal
DRAM PWM Phase Control: 2 Phase Operation
CPU VTT Special Add: AUTO
CPU VTT Voltage: 1.28v
VTT PWM Switch Frequency: Nominal
VTT PWM Phase Control: 2 Phase Operation
CPU PLL Voltage: 1.80v
IOH/ICH 1.1V Voltage: 1.11v
IOH Analog Voltage: 1.10v
ICH 1.5 Voltage: 1.5v
ICH 1.05V Voltage: 1.05v
DIMM 1/2 DQ/DQSTB Bus VREF: -00.0%
DIMM 3/4 DQ/DQSTB Bus VREF: -00.0%
DIMM 5/6 DQ/DQSTB Bus VREF: -00.0%
ADDR/CMD VREF Control: Disabled
x DIMM 1/2 ADDR/CMD Bus VREF: 110
x DIMM 3/4 ADDR/CMD Bus VREF: 110
x DIMM 5/6 ADDR/CMD Bus VREF: 110
CPU QPI Drive Strength: Normal
IOH QPI Drive Strength: Normal

Exit Setup Shut down: Mode 2
O.C. Fail Retry Counter: Enabled
O.C. Fail CMOS Reload: Disabled

PPM Function: Enabled
Turbo Mode Function: Disabled
1 core Max Turbo Ratio: 22x
2 core Max Turbo Ratio: 21x
3 core Max Turbo Ratio: 21x
4 core Max Turbo Ratio: 21x
CPU Non-Turbo Clock Ratio: 20x

* BCLK/UCLK/QPI Controller Settings *
QPI Control Settings: Enabled
QPI Link Fast Mode: Enabled
QPI Frequency: AUTO
CPU Base Clock (BCLK): 160 Mhz
Boot Up CPU Base Clock: AUTO
PCIE Clock: 101 Mhz
DRAM Frequency: 10:
UnCore Frequency: 20x
CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled

_________________________________________

With these settings i have good temps i thins (in idle 38C for the hottest core, with 28.4C in my room) and 60 - 61C under prime95.



So, since i want to push my 920 to 3600MHz i've read a lot of George's posts, in these topic:

http://i4memory.com/f80/dfi-lanparty...n-guide-12855/ ---> to have a sort of guide line on how to set the bios when u wanna oc your cpu, i've used George's settings to reach 3.2GHz at first, than i lowered CPU VID and other voltages as low as possible. I also used this guide to understand bios voices and to understand the right settings for CPU VTT, CPU VID, Memory ecc.

http://i4memory.com/f55/intel-core-i...ide-x58-13051/ ---> to understand what type of cpu i have and what kind of voltages it like.

I've also read the guide to understand the DFI on board messages when you get an error.

So, the most important thing that i've learned on i7 cpu's is that they are strictly connected to dram memory, and the most important voltages for a "standard" overclock like mine are CPU VID, CPU VTT and DRAM BUS VOLTAGE.

Also, if you want to get higher cpu speed i've understand that u have to look at other voltages but i think that this is not my scenario

i'm not interested in ultra high frequencies like 4.2 - 4.3GHz daily ('cause i don't have the know-how and the proper cooling to reach them). Right now i'm focused on my 3.6GHz 24/7 and i tried to reach that frequency but i need your help, 'cause i faced a lil' bit of weired problems.

Here's a list of my attempt (i've only changed CPU VID CONTROL and CPU VTT):

settings are BCLK: 200 | MULTI: 19x | DRAM FREQUENCY: x8 | UNCORE FREQUENCY: x16

First attempt:
1) CPU VID: 1.25 and CPU VTT: 1.28 ----> BSOD as soon as the loading bar of Vista disappear

so i thought, well maybe i have to increase both vcore and cpu vtt, so:
2) CPU VID: 1.28750 and CPU VTT: 1.34 ----> I can get into Vista but as soon i launch Prim95 i get instant BSOD

so i thought, maybe i have to increase a lil' bit my vcore and lower my cpu vtt, so:
3) CPU VID: 1.306 and CPU VTT: 1.28 ----> I can get into Vista but as soon i launch Prim95 i get instant BSOD

at this point i'm a bit confused 'cause the only good thing is that i can get into windows but no matter how i adjust voltages i get the same f***in' bsod.

So i started to do random attempt, tryin' to understand how my cpu is goin' to respond at my changes:
4) CPU VID: 1.29 and CPU VTT: 1.34 ----> I can get into Vista but as soon i launch Prim95 i get instant BSOD

5) CPU VID: 1.3000 and CPU VTT: 1.34 ----> Prime95 works for like 6mins then, bsod.

here i thought well, it better than nothing, maybe i'm on the "right road", maybe my cpu like the fact that CPU VTT and CPU VID are close in voltages.

6) CPU VID: 1.306 and CPU VTT: 1.34 ----> Prime works for like 2mins then, bosd

i was like, wtf? -.- well maybe CPU VTT is too low?, let's try like this:

7) CPU VID: 1.3000 and CPU VTT: 1.36 ----> instant bsod as soon as i launch prime (-.-")

8) CPU VID: 1.306 and CPU VTT: 1.32 ----> instant bsod as soon as i launch prime ()

then a lil' bit of light:

9) CPU VID: 1.31250 and CPU VTT: 1.34 ----> Prime works for like 10 - 12 mins then i get bsod when test number 5 starts.

I know that my attempt are a bit "casual" and that i've changed 2 things at the same time (when the right way to find something is changing only one parameter) but i can't really understand my cpu. It seems that hgh CPU VTT and high CPU VID are the best way to reach 3600MHz. But then i think: if this is correct, why it needs only 1.28 CPU VTT and 1.16 CPU VID to reach 3.2GHz? I mean, 3600MHz it's just 400MHz more, i don't think i'm asking too much at my 920.

Oh btw i have a lil' bit of vdrop with some voltages, my vdrop on CPU VID is like 0.004v (if i set 1.3000v in bios, i read 1.296 with CPU-z) and i have vdrop with CPU VTT and DRAM BUS VOLTAGE (this one, if i set 1.65 i read 1.63 in PC HEALT STATUS).

I'm sorry if my english sucks and if i wrote too much but i need some help to reach this goal.

Thank you in advance to everyone is goin' to help me!

.::NeO::.

Last edited by NeO; 01-09-2009 at 04:08 AM.
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Old 01-09-2009, 10:24 PM   #2
NeO
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*bump*

no one can give me some tips please? I'm having really bad time with my poor attempts. Any suggestion would be really appreciated
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Old 01-09-2009, 10:57 PM   #3
eva2000
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Hi Neo you wrote 19x200bclk but that is 3.8ghz not 3.6ghz. Or you mean 18x200bclk ?

Did you try messing with IOH volts as explained at http://i4memory.com/f80/i7-920-d0-df...ability-16617/ ? I'd try vcore around 1.35-1.38v for 3.8ghz i7 920 C0 if you are testing 3.8ghz and not 3.6ghz.

As to vtt requirements they get higher as all parts of cpu and mem are related. As you raise bclk frequency you raise qpi frequency which both require more vcore and cpu vtt volts. As you raise bclk you raise memory frequency which in turn raises uncore frequency. As you raise memory frequency you need more vdimm and as you raise uncore frequency you need more cpu vtt.
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Old 02-09-2009, 04:59 AM   #4
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By eva2000 View Post
Hi Neo you wrote 19x200bclk but that is 3.8ghz not 3.6ghz. Or you mean 18x200bclk ?

Did you try messing with IOH volts as explained at http://i4memory.com/f80/i7-920-d0-df...ability-16617/ ? I'd try vcore around 1.35-1.38v for 3.8ghz i7 920 C0 if you are testing 3.8ghz and not 3.6ghz.

As to vtt requirements they get higher as all parts of cpu and mem are related. As you raise bclk frequency you raise qpi frequency which both require more vcore and cpu vtt volts. As you raise bclk you raise memory frequency which in turn raises uncore frequency. As you raise memory frequency you need more vdimm and as you raise uncore frequency you need more cpu vtt.
Sorry boss, typo error. I'm tryin' to reach 3600MHz with 200 BCKL and 18x Multi. I've set memory at 8x and uncore at 16x (double the memory) so i can have my ram at standard settings.

btw i need some help with the voltages, especially with the theorical "safe range" voltages for a 24/7 use.

I mean i can push volts up with no problem at all if a guru like you say that it's safe , but if i'm alone i'm a bit scared .

tomorrow i'm gonna make a better list with all my attempt (tryin to change only one parameter per time), so maybe i can give you better details.

thanks as always for your hints and tips George
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Old 02-09-2009, 01:34 PM   #5
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There's no need to worry about vcore voltage at least. Only thing to be aware of is CPU VTT and VDIMM differential voltage of 0.01v to 0.5v but as you know DFI automatically prevent the user setting VDIMM further than 0.5v apart from CPU VTT.
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Old 03-09-2009, 04:14 AM   #6
NeO
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Hi George,

i have some news, not really good but it's a start.

Well i've played around with voltages for about 4 hours and the situation is a lil' bit better but still sucks .

So, the first attempt is all about CPU VTT. I left vcore at 1.3250 and played with CPU VTT, here are the results:

CPU VID: 1.3250v (set in bios) + CPU VTT: 1.32v (set in bios) = 25 mins of Prime95, then bsod.

CPU VID: 1.3250v (set in bios) + CPU VTT: 1.34v (set in bios) = 25 mins of Prime95, then bsod.

CPU VID: 1.3250v (set in bios) + CPU VTT: 1.36v (set in bios) = like 2 mins of Prime95, then bsod.

CPU VID: 1.3250v (set in bios) + CPU VTT: 1.40v (set in bios) = 6 mins of Prime95, then bsod.
____________________________________________________________ _________________________

Then, confused as always, i've played with vcore voltage, trying to see if my situation get better, here are the results:

CPU VID: 1.33750v (set in bios) + CPU VTT: 1.32v (set in bios) = 10 mins of Prime95, then bsod.

CPU VID: 1.34750v (set in bios) + CPU VTT: 1.32v (set in bios) = 35 mins of Prime95, then bsod.
____________________________________________________________ _________________________

So, as you can see, the "better" one is the last one but i really think that i'm going' too mutch up with the voltages, especially 'cause i'm only at 3600MHz.

I tried to figure out what kind of cpu i have, and the only thing that i see is that my CPU don't like high CPU VTT (as i increase this voltage, results get worse).

It seems that 1.32v - 1.34v CPU VTT range is the best. I still have to find the right vcore (1.32v is just good as 1.34, 'cause this one only gave me 10 mins more of prime95, and i think that this is not a real improvement).

So, George, what do you suggest? I'm really not sure on what to do. Are my thoughts right, or I'm still missing something?

Please help me, i'm in your hands.

Thank you again guru ,

.::NeO::.

Last edited by NeO; 03-09-2009 at 04:20 AM.
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Old 04-09-2009, 02:03 AM   #7
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So, i'm here with some news.

I've tried the most basic thing that you do when u oc your system. So i lowered my memory freq at the minimum (1200MHz) with 8-8-8-24 2T timings and 1.65v (read 1.63) vdimm. Tried 1.3250 CPU VID and 1.32 CPU VTT with 200x18 BCLK and launched Prime95. Result = only 15 mins, then bsod.

So i raised CPU VTT @1.34 and again bsod after the same exact time. Then 1.36 ecc. Same result. Even at 1.44.

So i raised my ram voltage from 1.65 (read 1.63) to 1.665 (read 1.64) and 1.680 (read 1.66) with 1.44 CPU VTT with the same result. Bsod after 15 - 20mins of prime95.

Even with 1.48 and 1.50 CPU VTT.

So my problem isn't my CPU VTT or DRAM VOLTAGE.

Then i tried to set my memory at 1600MHz 8-8-8-24 2T and leave my DRAM VOLTAGE to 1.65 (read 1.63) and my CPU VTT to 1.32.

Raised my CPU VID from 1.3250 to 1.3500 and woot! 2h and 45 mins of prime95 with no errors, but then again bsod.

Now i'm testing with 1.3560 (if i'm not wrong) with the same settings (1.65 vdimm and 1.32 cpu vtt) and i'm pretty sure i'm on the right way to find my 100% stability.

vcore is 1.34 in idle and 1.312 under full load.

I know, voltages are a bit high if you consider that i'm only at 3600mhz but that's my cpu, maybe is a lil' unlucky.

I learned a new thing btw: my cpu do not like high CPU VTT (infact if i raise this voltage i have no benefit or situation get even worse) but do like high CPU VID.

btw i think that my temps are still fine (i'm on air). 73C under prime for the hottest core aren't that bad.

I've also played with IOH voltages but it seems to make no difference.

So, anyone here think that i'm doing the right things? Or i'm totally wrong and i'm missing something important?

Any help would be really appreciated, thank you in advance.

.::NeO::.
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Old 05-09-2009, 03:05 AM   #8
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well, i'm reaching the rock solid status step by step.

Definitely i've got a bad batch and bad cpu. This sucker require a lot of volts, infact i need 1.3760v to reach 3.6GHz (prime stable 4hours, still testing).

My cpu also do not like high CPU VTT. I left it at 1.32 (set in bios) 'cause is the best value, under that is unstable, over that is unstable.

I dunno if raising IOH, ICH voltages will help me get stable with less vcore, i dunno how much do i have to raise them.

If i get the chance i'll probably gonna change my C0 with a D0 stepping in the near future...



BTW i'm finding pretty strange that for 3.2GHz my cpu is stable at 1.168 and for only 400MHz more i have to raise vcore so much... never seen such a huge discrepance in only 400mhz...

last thing to try is to update my bios at the latest version...
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