I7 overclock failing IBT.

[setter]

Ive been testing an overclock on my i7 920 do stepping, ran ibt earlier at 3.8ghz on the followingsettings

cpu ratio, 21x
bclk, 183
pcie freq, 101 mhz
dram freq, 1467 mhz
uclk, 2935 mhz
qpi link rate, 6605mt/s
ram timings, 7-7-7-24

vcore, 1.2500
pll volts, 1.84
qpi volts, 1.2500
dram volts 1.64

Load temps at 66-61-64-61

On theese settings the system passed 16 tests out of twenty before failng, unlike p95, ibt is a bit harder to pin down errors. Any advice or tips on where im going wrong. Thanks in advance.

 

[setter]

Success at last

After raising voltages to.

vcore, 1.2750v
qpi, 1.300v
ioh, 1.2v
ich, 1.2v

Slight rise in temps of 3-4c but still pretty good.

 

[Arachnae]

As i put in your other thread, you might have a better overall system if you use 200x19 as 200 is a nicer number for the ram frequencies etc.

Just a thought

 

[STutheTerrorisT]

Well played Setter was following your other thread on qpi and pll volts with interest. I'm running 200x19 with slightly lower vcore and qpi, what did you set your pll to and have you got llc enabled (I appreciate that's a completely different topic of discussion tho ) ? Will dig my settings out tonight, have pages and pages of notes, worked up to a nice stable 4.0

I agree with what Arachnae suggests about trying blck at 200 and multi at 19. For me this fits nicely as I have my ram running at 1600..

One thing with your IBT tho, why does it show 16 threads ? Shouldn't it be 8 or have I missed something ? Also, have you tried using LinX ?

 

[reygjabla]

Success at last

After raising voltages to.

vcore, 1.2750v
qpi, 1.300v
ioh, 1.2v
ich, 1.2v

Slight rise in temps of 3-4c but still pretty good.

If you check Core Temp, you will notice that your TDP is 147.3 Watts instead of 130.0 Watts. I Agree to 200 Bclk as well to make your RAM run at stated speed.

 

[setter]

Well played Setter was following your other thread on qpi and pll volts with interest. I'm running 200x19 with slightly lower vcore and qpi, what did you set your pll to and have you got llc enabled (I appreciate that's a completely different topic of discussion tho ) ? Will dig my settings out tonight, have pages and pages of notes, worked up to a nice stable 4.0

I agree with what Arachnae suggests about trying blck at 200 and multi at 19. For me this fits nicely as I have my ram running at 1600..

One thing with your IBT tho, why does it show 16 threads ? Shouldn't it be 8 or have I missed something ? Also, have you tried using LinX ?

Pll was set to 1.84, and llc is enabled, the 16 threads have to be entered with ibt due to a bug in the program when running 8 threads. Look forward to seeing your settings mate.

If you check Core Temp, you will notice that your TDP is 147.3 Watts instead of 130.0 Watts. I Agree to 200 Bclk as well to make your RAM run at stated speed.

Could you explain why tdp is higher than standard 130 watts reygjabla, or is there a setting in bios ill need to change? I was thinking that perhaps it rises due to increased processor load and higher voltages, if anyone can shed some light on this id appreciate it. Also ill certainly try 200 bclk. Thanks for input guys.

 

[DragonQ]

Hmm, I should try 190x20 instead of 181x21 cos my RAM would run more quickly. The reason I can't go to 191x21 is that I get blue screens unless I disable C-states (which I want enabled for now) but if it's a problem with the CPU speed rather than QPI or RAM then I should be able to go for 190x20 since the CPU speed won't change.

 

[STutheTerrorisT]

Hey Setter...

This is what I've been using for the 3.8 and 4.0. Neither have turbo enabled.

For me, both of these settings are overnight Prime95 blend and Memtest stable and also LinX stable but am still fine tweeking them, I reckon some of the volts could be reduced a tad more !!

At 3.8 idles @ 31 32 34 31C and 4.0 @ 35 34 36 33C

3.8GHz
CPU Ratio 19
Speedstep DISABLE
BLCK FREQ 200
PCIE FREQ 101
DRAM FREQ 1603
ULCK FREQ AUTO
QPI FREQ AUTO

CPU VOLTS 1.2375
CPU PLL 1.90
QPI/DRAM 1.2375
IOH VOLTS 1.20
IOH PCIE AUTO
ICH VOLT 1.20
ICH PCIE AUTO
DRAM BUS VOLT 1.66

LOADLINE CALL ENABLE
CPU DIFF AMP AUTO
CPU CLOCK SKEW AUTO
CPU SPREAD SPEC DISABLE
IOH CLOCK SKEW AUTO
PCIE SPREADSPEC DISABLE


4.00GHz
CPU Ratio 20
Speedstep DISABLE
BLCK FREQ 200
PCIE FREQ 101
DRAM FREQ 1603
ULCK FREQ AUTO
QPI FREQ AUTO

CPU VOLTS 1.3000
CPU PLL 1.90
QPI/DRAM 1.35
IOH VOLTS 1.24
IOH PCIE AUTO
ICH VOLT 1.20
ICH PCIE AUTO
DRAM BUS VOLT 1.66

LOADLINE CALL ENABLE
CPU DIFF AMP 800mV
CPU CLOCK SKEW DELAY 100PS
CPU SPREAD SPEC DISABLE
IOH CLOCK SKEW DELAY 100PS
PCIE SPREADSPEC DISABLE

I fully appreciate what's right for one ain't always right for someone else but it's a guide and worth trying... No doubt you'll fine tweek them yourself

Good luck with it and keep us updated.. I had so much fun spending hours reading up, making notes trying to get the bloody thing stable ha-ha-ha-ha

(I'm on Vista Premium 64bit, have 6GB of Patriot Viper 10666 (1333MHz) running at 1600MHz and am powered with a Thermaltake Toughpower 1000w)

 

[setter]

Thanks stu, im gonna try to hit 4.0ghz first with turbo enabled, 21x193 bclk, (ive been going up in increments of 10) this will leave my ram running a wee bit below spec of 1600mhz, timings at 7-7-7-24, not much of a performance loss i suppose. Ill definitey try with a lower ratio as well to get the ram running at rated speed of 1600mhz.

 

[STutheTerrorisT]

All good mate.. You won't notice the slight difference in memory speed for everyday normal use.. Happy tweaking ha-ha !!

Have also noticed that in Everest under Computer - DMI - Processors and clicking on your cpu, it show the VID of the chip, if you were wondernig.. I may be mistaken with this tho, mine shows 1.2v even though in the bios I've had 1.3 and 1.4 set as the volts.. If anyone else knows different please feel free to correct me..

 

[setter]

Dont have everest myself, but it does seem odd that vid info is missing on the i7 cpu's, with speedstep/c1e disabled i think mine was around 1.2 at stock., though upto 3.6ghz i was running it at 1.18.

 

[kyleax1]

LinX is good, it doesn't push as hard though. I ran 50 loops of LinX and my max temps were 2-3c lower then 20 runs of IBT.

Download LinX though and make sure you are stable for 50runs using maximum ram.

Also run 8-12 hours of each Prime95 preset test.

Once you have passed all these you know you are as close to 100% stable as possible.

 

[setter]

Ive used linX in the past and p95, small fft and blend. p95 may take a bit longer but it is actually my preferred testing app, 8 hours minimum is my normal p95 test regime on both fft and blend.

 

[capriboy1978]

CAn anyine elaborate about ibt using 8 threads? My system is failing ibt left right and centre at the moment (HT on) when running 8 threads.


edit


no idea why but when set to 16 threads it's stable. On the reverse a stable OC at max settings using 16 threads is unstable when using 4 (50% load on the cpu). OC is driving me nuts!!!!