OC My i7 940

[jwenham]

I am going to listen in on this thread if I am not disturbing, maybe also chip in with questions from time to time. My I7-940 system is all set up and what I found puzzling is that while the system always passes Mem86+ testing, boots in Windows and proves to be Prime stable at any overclock - it turns out never stable in FSX in the end. Mostly I encounter reboots in FSX after some half an hour flying even after the system was stable with Prime for several hours. On stock FSX is absolutely stable.

Also am not entirely clear on how to finetune DRam and VTT voltages although as I said my settings prove to be OK with memtest and Prime.

Thank you in advance and I am listening.

Alex

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Intel i7 940 2.93
Asus P6T Deluxe V2 MOBO
3gb OCZ Extreme 1600 8-8-8-24
8800 GTS 512
Akasa Nero 967 cooler
Chiedtec 750 W PSU
250 Gb WD HD
300 Gb WD Velociraptor HD
19" Samsung 940BW Widescreen
Track IR 4
XP 32bit SP3

First thought would be not enough ram and 32 bit OS. With your hardware you really need 6 gigs and a 64 bit OS (Trust me).

[Axelb9]

First thought would be not enough ram and 32 bit OS. With your hardware you really need 6 gigs and a 64 bit OS (Trust me).

Thanks, I thought that sooner or later someone would pick on that and I tend to believe that there could be some (if not much) effect on general performance however I do not think it has much to do with overclocking stability. I never ever have OOMs and at stock voltages FSX is as solid as can be. I would tend to think that the 64 bit OS would only concern and positively influence a situation with OOMs. Hopefully I am not wrong alltogether.

[NickN]

You guys want clock settings and voltages.. here they are ..

but you must apply the correct BLOCK, memory speed and timing and the right Vcore (CPU Voltage) based on your memory and your CPU clock speed and the temp of the CPU

http://www.simforums.com/forums/forum_p ... 227#174227

all other settings are EXACTLY the same for all clocks. I noted the settings that may need to be adjusted. Even if you are not clocked with 1600+ memory your QPI/DRAM Voltage should be 1.35-1.37v and the DRAM 1.65-1.66v


and DONT MESS with Amplitude or SKEW.. those settings are for people like me with a background electronic engineering and should only be applied by a qualified tech when needed.

[jwenham]

I have the 940 and this is how I have mine set 100% stable:

CPU Ratio - 21
BCLK - 191
DRAM Freq -1531 using 1600 ram
CPU voltage - 1.34375
QPI - 1.325
Dram Bus Voltage - 1.64

I have tried and tried and cant get a OCCT stable clock using the 22 cpu ratio.
Good luck and let us know how you do with the OC.

Jim

[Axelb9]

I have the 940 and this is how I have mine set 100% stable:

CPU Ratio - 21
BCLK - 191
DRAM Freq -1531 using 1600 ram
CPU voltage - 1.34375
QPI - 1.325
Dram Bus Voltage - 1.64

I have tried and tried and cant get a OCCT stable clock using the 22 cpu ratio.
Good luck and let us know how you do with the OC.

Jim

Thank you Jim, that is exactly my target. I have set my eyes on 21 x 191  as well.

Actually yesterday I managed to achieve an FSX stable OC for the first time (which is also OCCT stable) so hurray

I am quite far from the target though. This is where I am at right now:

CPU Ratio - 21
BCLK - 175
DRAM Freq -1400 using 1600 ram
CPU voltage - 1.30
QPI - 1.35
Dram Bus Voltage - 1.64

Have you optimized QPI voltage at all or just set at what you have it now and prayed? Does it have any effect on temps in your opinion? How is that setup going over large forested areas - can you do very dense autogen without stutters?

Alex

[jwenham]

Yes I optimized the QPI. I kept going down 1 notch at a time untill not stable in OCCT then set it a 1 notch above that level. As far as the temp QPI voltage has I did see a very small drop as I was lowering it but nothing earth shattering to make any big difference. The Vcore is where most of the heat is comming from as well as any residual heat from the VC and PSU. Go ahead and go for the 4 ghz settings Nick has posted and optimize from there and see what happens. The settings he gave are very safe and 99.9 % sure you wont hurt anything but OC'ing is a risk and not a 100% sure bet.