Help Overclocking a Maximus Gene V and 2700k. 8 Pack are you there?

8 Pack said:
With LLC at low to medium though yuo are followig Intels recomended voltage droop under load. They want this droop to occur to take into account for these spikes and protect the chip as its loaded. LLC at reg or medium is all that should be used when clocking for 24/7.
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but what im trying to get at is even in fixed mode you'll get the spikes, example if your aiming for 1.40-1.425v u would need to set the vcore to about 1.5-1.525v if your using LLC on low or medium so going from load to idle u could see spikes of 1.45-1.475v which isn't good.
 
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Right i've done some fiddling and the results are mixed

I've changed
VCCIO to 1.15v
VCCSA to 1.1v
LLC from very high to medium
CPU Voltage from 1.31v to 1.37v
PLL Overvoltage Enabled
Turned off all the C-States
PLL is still at 1.8 (didn't want to change too much at once, and something else i'll come back to in a bit)

I haven't changed The Skew Driving voltage from 1.050 to the 0.4 in your screen shot from the other thread (seemed like a massive jump and didn't want to go changing too much at once)

Now i'm not stable - i'm getting blue screens when try to run prime BUT my load temps seem to have dropped a bunch from when i was running LLC on very high - like 7-8 degrees - after 5mins of prime i'm now at 60 degrees C

CPU Voltage of 1.37 translates to 1.312/1.3.04 under load as measured by CPU-Z (Core temp however reports the vid under load as (1.3711)

Now i have a couple of questions.

OcUK state anything over 1.38 volts is getting into dodgy territory for sandy bridge cpus - is this right? OR will i be OK as i have better than stock cooling?

Is there a systematic method for tuning PLL?

Do i just get stable then lower the cpu voltage and experiment with different PLL values to see if i can return to stability?

Or would you get stable, then change PLL to see if you're still stable then try lowering the CPU voltage (which sounds like it will take a lot of time...)

Or do i just start really low say 1.45 like you said then work up (at the same time as CPU Voltage to find stable combinations)

Obviously i've changed a lot of values in one go already and want to get back to tuning just one thing at a time...

Any input or insight gratefully received

BTW see anything good at the cinema?

Dave
 
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ignore Core temp voltage vid... it basicly means it's what the cpu wants (the voltage value you set in the bios) but the cpu won't get that under load due to LLC but at idle the voltage may goto near the voltage value you set in the bios because your using fixed mode it doesn't drop at idle.

this was my point above when using fixed mode
 
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OK - what about Skew Driving Voltage??

And the 1.38 volts max?? I've read elsewhere Intel say 1.52 volts as long as the chips stay around 70 degrees....
 
No its Intel spec for Sandy 1.5v and SB-E 1.4v

Keep your eye on temps and dont stress test to the hilt. Use your PC as you normally would for stress testing and adjust from that.

Stress testing is a synthetic, un-natural pressure on the silicon and at the end of the day what does a month of prime prove and a year of IBT , It proves your system can run Linx and prime but nothing else!!!

Although I am not exactly the right person to be advising on safe volts he says with 1.8v through his Ivy and never one bit less
 
skew driving cool - gotcha

stress testing - i agree that's why i like prime95 blend, i feel it stresses but won't heat the chip up way beyond what i would experience gaming say.

I've upped the voltage to 1.39 and am still getting blue screens, with a dump error of 124 which apparently is VTT (VCCIO) voltage being wrong...hmm
 
8 Pack I was reading this thread with interest (Gene V + 3770k) - some great tips there - I was particularly interested in your comments re Vcore and LLC

my 3770k (rubbish one) - needs 1.32V @ LLC V. high

and 1.355V @LLC High (1.32V after droop)

not sure what is worse for the chip?

thanks
 
Ah man! i think i have 4.6 stable and am pushing for 4.7 but i just can't get it stable...

So far i'm at

CPU Voltage - 1.425
Ram 1.5
VCCSA 1.1
VCCIO 1.0
CPU PLL 1.5

Prime just keeps throwing up errors...

4.6 seemed to be stable way back at 1.39 volts

I'm also getting near the limit of my cooler - 73 degrees...any ideas 8 Pack?
 
Buckster said:
8 Pack I was reading this thread with interest (Gene V + 3770k) - some great tips there - I was particularly interested in your comments re Vcore and LLC

my 3770k (rubbish one) - needs 1.32V @ LLC V. high

and 1.355V @LLC High (1.32V after droop)

not sure what is worse for the chip?

thanks
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Hgher Vcore Lower LLC
 
BS Dave said:
Ah man! i think i have 4.6 stable and am pushing for 4.7 but i just can't get it stable...

So far i'm at

CPU Voltage - 1.425
Ram 1.5
VCCSA 1.1
VCCIO 1.0
CPU PLL 1.5

Prime just keeps throwing up errors...

4.6 seemed to be stable way back at 1.39 volts

I'm also getting near the limit of my cooler - 73 degrees...any ideas 8 Pack?
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Try tuning VCCIO
 
to be honest i've tried all different sorts of settings this afternoon and got nowhere. i think i'm gonna setting for 4.6 and get that locked down with as few volts as possible.

Bit of a shame as i had hopes for 4.8, and my previous chip a i5 750 did 4ghz (which in my mind was something pretty special)

4.6 in my books is distinctly middle of the class
 
BS Dave said:
to be honest i've tried all different sorts of settings this afternoon and got nowhere. i think i'm gonna setting for 4.6 and get that locked down with as few volts as possible.

Bit of a shame as i had hopes for 4.8, and my previous chip a i5 750 did 4ghz (which in my mind was something pretty special)

4.6 in my books is distinctly middle of the class
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As I am sure you are aware - not all cpu are equal.Perhaps you have an overclock limited cpu, but 4.6 stable isnt too shabby,Would have been nice to get more, but it always is a lottery with cpu.Enjoy it at 4.6.

Mark
 
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