O/C Advise: 920@4GHZ - UD3R Mobo

Atomic

Atomic

Atomic

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27 Jan 2005
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830
I have a stable 4GHZ O/C, but I want to play with the memory and reduce the CPU voltage is that's possible and wise to do. I have no idea how to play about with the memory settings and that is totally alien to me.

I'd like some advise on this is possible, and below are my current settings and configuration:


CPU: I7 920 D0 stepping
Mobo: Gigabyte x58A-Ud3R Rev 1.0 with F5 BIOS
RAM: OCZ 3x2GB RAM 1333mhz-CL 9-9-9-20 (CAS-TRCD-TRP-TRAS)
Case: Coolermaster Dominator 2 with additional fans
Cooler: Noctual dual fan and dual radiator beast.
GFX: HIS 5850 running at stock speed (would like to overclock)
PSU: Antec Truepower 750W

Current BIOS Settings:

CPU Clock Ration: [x20]
Turbo Boost: [Enabled]
CPU Clock Ration: [x36]
Uncore: [x13]
Isochronous support: [Disabled]
BCLK: [200]

Performance Enhance: [Auto]
System Memory Multiplier: [6.0]
Dram Timings: [Auto]
Load Line Calibration: [Standard]

CPU Vcore: [Auto]
QPI: [Auto]
IOH: [Auto]
DRAM: [Auto]


Temps & Voltages According to Easy Tuner 6:

CPU: 1.360V
DRAM: 1.584
CPU Temp: 33 C idle
GFX Temp: 49 C idle




CPUZ is reading my memory at:

NB Frequency: 1200MHZ
DRAM Freq: 600MHZ
 
that's a 4.2GHz OC because you have turbo enabled

keep the memory speed as low as possible, otherwise the CPU OC may become unstable

1.36v? have you even tried prime95 or IBT to see if it's stable? I'm guessing not because even with water cooling you'd be expecting >80C. IMO max volts you should put through an i7 is 1.32v and 4GHz should only need 1.25v
 
dear god man! never, ever run a high OC with voltages on Auto... the vast majority of motherboards will over-volt horribly, with the possibility of frying everything.

Dropping the Voltage won't hurt at all. The worst that can happen is it becomes unstable, in which case you just bump it back up a little. Bear in mind, the voltage difference between your Vcore and DRAM should be less than 0.5V (not sure about QPI and IOH though).

As for the actual OC... i7s OC much better with an odd (non-even) multiplier. Try that.

You could push the BCLK to 222 before the RAM hits its rated speed, but you might prefer to play with the timings (might be able to squeeze them down, as you are below rated speed).

I can't tell you what settings will work, but just try dropping the numbers down a little bit, run Memtest to find out if it stable, go back and try other stuff. The Command Rate should be 1 or 2 (2 is better), all others lower is better. The CAS latency makes the most difference to performance.
 
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Okay, I've just got my first BSOD as a result of overlocking and testing with Orthos.

Jist of the Message:

[Clock interupt not received on secondary processor. Stop: 0x00000101]


I've lowered the CPU volts to 1.25.

I've changed teh memory settings to reflect my ram timings of 9-9-9-20 with command rate of auto.

I have ran orthos for one hour with no BSOD under auto voltage. Do I need to up the voltage of the CPU.

I've not changed any other voltages. I have also disabled Turbo.

PC runs find on idle and I have idle temps of 31 C

*POST EDIT*

I've upped the voltage to 1.28125 in the BIOS. Ran orthod for 20 minutes before a BSOD. max temps were 62C. Shall I up the CPU Volts a bit or do I need to give my memory more volts or something?
 
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turn turbo off and go back down to 1.25v, should be fine then

or alternatively turn the volts up to 1.29 or 1.3 and see if it's stable
 
wilko49 said:
dear god man! never, ever run a high OC with voltages on Auto... the vast majority of motherboards will over-volt horribly, with the possibility of frying everything.
Click to expand...

No modern non bargain basement motherboard will overvolt to the degree it will take all your components.
 
Okay:

I've turned turbo off.

I've put the volts to 1.3 in the BIOS

Set memory to AUTO but with multipler of 6 so my memory is actually running at 1200 when it's stock is 1333mhz

Set DRAM to auto.

Computer was unstable at 1.25 volts, but seems far more stable at 1.3. that's set in the BIOS.

However, I've just ran Orthos for a half hour (I know it should be longer) but everything seemed fine so far. However, CPUZ is reading the voltage at 1.232 and it does change a bit as Orthos is running.

1.jpg
 
I've seen a Gigabyte P55 board on a Vcore of 1.5V using auto voltages, which is quite a lot higher than most people would let their CPU run at. So yeah... I feel my comment is justified.

Try upping the clock drives, should be under Advanced Frequency Settings.
 
Okay, I've made a little progress, but not much. My system does not seem stable at 1.25 volts set in BIOS.

My system does seem stable with higher voltage as you can see below. My problem is temps and would maybe best to have them lower.

I have tighten, or at least I think I have, tightened my RAM timings to 8-8-8-16 when they are stock at 9-9-9-20. @ 1333MHZ I've read the '20' should be 24? Also people are running these at 1.66 volts at 1800mhz. I can set the MHZ but not sure what options changes the RAM Voltage?

I also think I need to lower the voltages of the CPU, but I'm not sure what setting other voltages need to be at such as DRAM and QPI VTT.

Is it a good idea to focus on lowering the CPU voltage a little and then work on the other voltages?

I've ran Lynx without errors and his mid 80's after a day of computing use and various other benchmark tests.

2.jpg
 
Mines set at 1.275 for both qpi and vcore, with load line callibration on, underload this drops to 1.256, i could probably get away with maybe abit less on the vcore, but as my clock is stable and heat is not an issue, im gonna leave it be.

It main to volts u want to set manually are cpu vcore, and qpi/vtt (this more then any) the lower u can get qpi the better, as having this to high can cause a lot of heat. I notice from easy tune its set for 1.35v, thats rather high for that clock, id try and lower that, and the vcore also for lower temps.
 
Thanks to all who are helping me or giving advice. I am very appreciative :)

I've made huge progress, I hope.

I've enabled LLC at Level 2

I've set BCLK to 211 and multiplier to x19. This seems more stable than 200 and x20

I've just ran Prime 995 FFT for 4 hours and no errors or warnings. I'm happy with that so far.

If I lower my volts in BIOS my 1 notch prime gets various errors, so had to up the volts to what you can see in the image below and everything seems stable. It's been a warm day and in my room which can get quite warm I think the temps look acceptable at mid 77's

I'm just wondering if I can make additional tweaks to other areas such as QPI PLL, QPI PTT etc. I've left these on auto in bios.

I've also allowed BIOS to auto set the RAM and it is underclocking it I think. I want to come to the RAM soon, but want to get CPU stable and running good.




4hoursprime.jpg
 
What exactly does load line calibration do then? I've got my 920 running at 3.8GHz using 181x21 with 1.25625V but would be tempted to push for more if what Nodiggidy123 says is true.

edit: missed out a digit on the voltatge as kindly pointed out below.
 
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1.5625v?

LN2 users barely use more than that

anyway LLC essentially changes vcore and multiplier depending on load % and heat
 
I have no idea why my system is not stable. Linx fails have the first round of testing.

Does anything stand out in the screenshot that needs tweaking. If I lower the Vcore anymore Prime95 fails within seconds. These settings below still get Linx errors, but does make it past the first few mins of Prime95 - though I do need to leave it longer.

4.jpg
 
You may need to increase VTT for the high bclk you are running, whats it currently set to?

Also if its failing IBT and passing a "few" minutes of prime then it sounds like it needs vcore raising as well
 
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