I7 4Ghz OC Stability...

Still cant seem to get prime blend stable for more than about 4 hours. Passes occt test now but prime95 blend crashes after 4-5 hours.

Bulldog, I wont get a stable OC with that low a vcore at 4Ghz, and I notice your memory is massively underclocked. 191x19..?, isnt that 3.8Ghz with turbo on.
 
Im not sure how you guys are having such lucky with low Vcore and high oc

im at 3.8ghz and need 1.3v vcore in bios. needs 1.37v for 4ghz.

either i have a very bad chip or im crap at OC
 
bulldog147 said:
Make sure your motherboard (gigabyte ex58-ud5) got 5 blue lights (next to memory ram) and nothing elses (no yellow, green or red light) as it mean stable overclocked and stable voltages.
Click to expand...

I got the five blue lights on for the overclock, 1 green for the memory voltage which is 1.64v, and there is 1 green by the cpu.
 
DavyBoy said:
I am curious as to why you dont have your RAM running @ 1528MHz, you do have 1600MHz RAM right?

Why don't you have the mem multi @ 8x and your uncore multi set to 16x???

Seems a little strange having 1600MHz RAM underclocked to 1146MHz... if your RAM is only 1333MHz then ignore what I have just said!!! :P
Click to expand...

Yes my memory ram is 1333MHz as it had 6 x 2Gb of 1333MHz with maximum voltage for these ram are 1.50v as I am using 12Gb of ram on my 64 bit windows 7.

I will going to buy new memory ram with very low latency at 2000MHz (6 x 2Gb) at 1.640v but it very expensive at the moment. :(

Thanks for like my monitor (guess what ? - I use the same 17" monitor since 1997 - would you believe how good my monitor so far)
 
Gaidin109 said:
Bulldog, I wont get a stable OC with that low a vcore at 4Ghz, and I notice your memory is massively underclocked. 191x19..?, isnt that 3.8Ghz with turbo on.
Click to expand...

Yes, I am using 191x19 with turbo on with intel turbo boost enabled too that push my cpu clock speed from 3.82Ghz to 4Ghz with 4011Mhz clock speed with a very low vcore voltage.

I can use 200x20 with turbo off and intel turbo boost disabled but it need stable at 200x20 at 1.25vcore at the bios but I prefer to have my lower vcore at 1.17v at the bios for 4Ghz which it more than enough to stable my pc and probably OCUK had gave me a cherry chip :)
 
boldenc said:
bulldog vcore is really very low, the bios reads it as VID 1.14375v
mine the bios reads it 1.26575v
Click to expand...

Yes, I know it a very low voltage but surprise me it stable my pc for over 3 weeks now with my H50 with no crashes, no freeze and more important no blue screen death or boot up failure. (touch my wooden table) I guess I am lucky indeed to have my cherry chip.
 
DavyBoy said:
Could you let me see the RAM timing screens in Advanced DRAM Features, you know the Advanced RAM timings, and also a look in the Advanced Voltage Control as well if you don't mind?

Oh, and also Uncore & QPI Features, Advanced Clock Control, and Advanced CPU Features as well please!!! :D
Click to expand...

Sure, no problem, I will do it later on depend if my wife are not plan to go out tonight with me for a meal ! My wife often using her laptop as she never understand the world of my desktop pc overclocked and told me to stop spending any more cash at OCUK. :(
 
Hi boldenc, I have tried mine with the same voltages as you are using, and it just refuses to go there mate...

Out of curiousity, which RAM are you using?

Your timings are nice and tight, I have tried using 8-7-7-21-1T for my 1600MHz Dominators, but I get an immediate BSOD when I fire up Prime or LinX...

This chip is a nasty sample.. I want my old chip back, as I don't think the RAM issue I was experiencing had anything to do with the chip now.. I think it was my Zalman mounting bracket that was causing the problems, as strange as that sounds, there have been other people online who had the same issue, and loosening their HSF screws sorted the problem for them...
 
DavyBoy, before you give up on 4ghz try this...

Set bios back to defaults to begin. Then set as below (anything not shown below leave as default):

CPU clock 20x
CPU 3.82ghz (191x20)

Under advanced cpu features

Intel Turbo (enabled)
CPU core (all)
Multi threading (enabled)
*everything else in here enabled except:
state support (disabled)

Back to main tweaker screen...

QPI (auto)
QPI 6.87

Baseclock (BCLK) -Enabled
BCLK Freq - 191

Under advanced clock control

Base clock - enabled
BCLK - 191
PCI Express freq - 101
C.I.A.2 - disabled

CPU clock drive - 900mv
PCI Express clock - 700mv
cpu clock skew - 0ps
IOH clock skew - 0ps

Back to main tweaker screen...

Performance Enhance (standard)
System memory (auto)
memory freq - 1528 (*as long as you have 1600mhz ram)
Dram Timing - manual

*Now set your ram timings slack, something like 9-9-9-28-2 on all channels (A,B,C), ..tighten ram timings later ..once you know cpu is stable @ 4ghz.



Load line calibration - ENABLED *important

CPU vcore 1.3000v
QPI /vtt voltage - AUTO
IOH - AUTO
Dram Voltage - 1.64v (*if your ram is rated at 1.65v)


Try those settings for 4ghz, if its unstable but your temps are ok, try keeping all those settings as they are above, but just nudging the vcore up from 1.3000v, one step at a time on the voltage options until its stable. Give up on the above if its not stable before you reach 1.35v.

Goodluck
 
hmmm, too all 4ghz oc people with low Vcores. Did you enable LLC to get your vcore that low?

if you did, then it'll make sense to me, otherwise im quite dissapointed in my I7 :(
 
Finally passed OCCT with flying colours, seems it was a memory timing problem and qpi/vtt volts. vcore is set at 1.216 and it all seems cool. My VID is 1.1625 by the way so not quite as good as 1.14 of bulldog, lucky chap.
 
Got a nice stable OC now thankx to Bulldog explaining the motherboard lights.
Passed OCCT, Linpack, IBT on maximum 16threads, and 2 hours Prime95 Blend. Used 191x19 and got the memory timings down to 8,8,8,24,2T with only 1.5v, and you can see the rest in the pic.......



stableblend.jpg
 
Thanks for the suggestion mate, but it isn't going to happen with this CPU I'm afraid...

I was up til 4am yesterday, and I spent the entire day trying loads of different settings in the BIOS, and nothing will give me 4GHz.. I have tested right up to 1.35v Vcore, loosened up my RAM timings, QPI/Vtt I have tested from stock right up to 1.4v, tried underclocking RAM by using 6x mem multi, and it isn't happening at all..

I have got it stable @ 3.8GHz, I need 1.275v in the BIOS for Vcore (1.264v in CPUZ) and I need 1.300v QPI/Vtt..

The thing that is really making me frustrated with this chip is the temps..

With my old processor at stock it would idle @ 36c, but this dog is @ 44c when it is at stock, my old chip would sit at 44c when it was clocked to 4GHz, but this chip is idling @ 51c on the hottest core, and it hits 88c under load when running LinX...

And the last processor was being cooled by an old Zalman 9700NT, I am using a TRUE on this new chip, and the temps are unacceptable... even with 2 fans on the heatsink.. infact there is absolutely no difference in temps when using 1 fan or 2 fans, so I have went back to using just 1...

I thought maybe I hadn't seated the TRUE properly, but I have reseated it about 3 times now and applied a little more TIM and it hasn't made a blind bit of difference...

I am going to dig out my 2nd TRUE and test it, just incase the one I am using has a dodgy base... you never know...

I find it strange how my old Zalman kept my last chip so cool yet my TRUE a HSF that a lot of people say is the best there is, is struggling to keep my chip cool!!!

Really really frustrating tbh.. I was always under the impression that ALL D0 stepping i920's could hit 4GHz without to much problems.. but I have been proven wrong with this nasty sample...

I am buying another 920 at the start of next month for my second build, but I am really worried that I get another crappy chip again... I don't want to throw away yet more money on something that won't run stable @ 4GHz... :( :(

It is really annoying, because my last chip would do 4GHz no problem, and it looks as though it wasn't even my chip that was causing the problems I was having before anyway... But there really isn't anything I can do about it now..

Hopefully I can get a decent sample when I buy my second processor though.. hell I would pay extra just to get one of these cherry chips that require extremely low voltages for 4GHz!!

I don't know why they don't sell 920's that are guaranteed to run at 4GHz like they used to do with the old Q6600's... maybe they will start something like this though.. I recon there would be plenty of folk out there that would be willing to pay extra for these chips...
 
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LoL.. thanks for the suggestions mate.. but I have tried all of this!!!

I already said in my last post that I tested QPI/Vtt from stock right up to 1.4v, I have played around with all other voltages as well to no avail.. I won't give up on it quite just yet!

My RAM needs 1.65v for 1528MHz, any less then it just BSOD's straight away..

CPU and clock cycle sets itself to those values you have stated when you first load Optimized Defaults.. so there really isn't any need for me to change them, however, if you don't load Optimized Defaults first, then it will be at 700...

I will test out my 2nd TRUE tomorrow now to see if that will help my temps any, because atm they are just way to high for my liking..

I've went and setup my 2 Raptors in RAID0 and have just finished installing Win7, and I am just finishing off loading all my drivers up..

I will get some stress testing done tomorrow now as I really need to get to bed!!!
 
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