4.6Ghz on Haswell, Looking at 4.8. Help!

lettuce

lettuce

lettuce

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I have achieved a 4.6 OC on my i74770k haswell chip (system in sig), these are the settings i used in the BIOS....

iToRoIihjD8Uq.BMP
iboqcUkHA1vHpg.BMP


ib170WKx6unfhT.BMP
iOIgFk9uG12BU.BMP


iYH5zyc6s2iQ6.BMP
ib0i9hBtN13VdH.BMP

Am now looking at 4.8Ghz, the only settings i have altered from my above OC are....

CPU Clock Ratio 4.8
Uncore Freq 4.7
Turbo ratio 4.8 (for all 4 cores)
Turbo Power Limit (watts) 100 (was on auto b4)
CPU Offset +0.190

This give me a voltage reading in CPU-Z of 1.320v, which im not sure about for a 24/7 OC???, OCCT lasts only about 3 minutes before blue screening. Is there any suggestion on getting this OC stable without upping the CPU voltage anymore??
 
did you catch the bsod code?

might need even more cpu v for 4.8ghz

try raising the power limit to 120w
 
wazza300 said:
did you catch the bsod code?

might need even more cpu v for 4.8ghz

try raising the power limit to 120w
Click to expand...

More than 1.320???....thats getting into dangerous territory then isnt it??. I have tried a value of 300 for Turbo Power Limit, but didnt help


stuie said:
What temperatures are you getting with that clock?
Click to expand...

On my 4.6 OC????....max temp for all cores was 62,62,63,62c after 3hr 20 in ADIA64
 
ur ok for testing but idk with haswell,i think they said 1.3v for ivy but ive seen folks use much much higher 1.4v+
 
Just odd that i can get a stable OC @ 4.6 with 1.205v but need over 1.3 to get into windows with 4.8Ghz
 
Mine will boot into Windows on the same board @ 4.8Ghz with <1.3v on the same board.

Forget about stress testing it though. It's 90c...
 
wazza300 said:
youll find they need a big bump in voltage after a certain clock
Click to expand...

This is exactly what I've found with Haswell.

4.6GHz 1.21V
4.7GHz 1.26V
4.8GHz 1.35V

I can actually boot into Windows and run SuperPI 32M at 4.8GHz at just 1.25V but to get stable in Prime95 I'm needed to bump it up quite a lot and even then I'm not sure it's entirely fully stable. Then to boot in Windows at 4.9GHz and run PI again looking at 1.36V

For 24/7 use I think I'm going to settle for 4.7GHz.
 
another indication or too low a cpu voltage on ivy anyway is amd catalyst control centre closes due to a problem at startup

two or three clicks more cpu offset cures it,don't know if you get that on haswell
 
Hmmm, i moved away from CPU Offset of voltage to see if i could get 4.8 stable so went back to manual, tried 1.3v and got 8 minutes out of OCCT (the most ive got b4), then tired 1.31, about 6 minutes in OCCT, then 1.32 and 1.32 and OCCT only last about 1 minute. How come ive added more voltage yet the stress doesnt last as long?
 
Last edited:
you tend to need slightly more offset as apposed to a fixed voltage,problem with that is cpu doesn't downclock

idk what llc level your using maybe one level higher?

vcore will droop slightly anyway so you never actually use what you set,slightly less
 
Have noticed that CPU Base Clock need to be raised to 101 to 103Mhz to get it to report at 100mhz in CPU-Z, was this the same for Z77 mobos?
 
A few pointers from me,

• LLC+ Phase control set to Turbo/extreme.
• Increase the Core+Turbo power limits (300/150 people say, I just do 300/300)
 
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