When stress testing my 3770k at 4.7GHz with prime95 my multiplier holds x47 but then drops to x44 and then goes back up to x47 after awhile? How do it keep it at a stable x47?

Did you do the below?
 
From the Overclocking tab, navigate to CPU Configuration:

• C1E set to Disable - This is a powersaving feature

Next navigate to CPU Power Management Configuration:

• CPU C3, C6, and C7 Report also set to Disable

EVGA_JacobF


Did you do the below?

From the Overclocking tab, navigate to CPU Configuration:

• C1E set to Disable - This is a powersaving feature

Next navigate to CPU Power Management Configuration:

• CPU C3, C6, and C7 Report also set to Disable

Yes.

Hmm, let me check. Temps are good?

EVGA_JacobF


Hmm, let me check. Temps are good?

Temps are in the low 70's.

jacob, geez man, it's Saturday night and you bro are still helping others, remarkable!

Fixed the multiplier dropping issue. What I did was...
 
From the Overclocking tab in BIOS, navigate to CPU Configuration, then navigate to CPU Power Management Configuration and set:
 
IA Core Current Max(1/8 AMP): 2040
Power Limit 1 Value(1/8 WATT): 2040
Power Limit 2 Value(1/8 WATT): 2040
Long Duration Power Limit: 255
Long Duration Maintained: 120
Short Duration Power Limit: 255
 
Holds a steady x47 now.
 


^what were those values at at default?

feniks


^what were those values at at default?

IA Core Current Max(1/8 AMP): 896 
Power Limit 1 Value(1/8 WATT): 616
Power Limit 2 Value(1/8 WATT): 770
Long Duration Power Limit: 0
Long Duration Maintained: 1
Short Duration Power Limit: 0

My bus speed isn't reading 100.3. It's reading 99.8 in eleet.

Does anyone know what to increase bclk to in order for it to be this and I'm also having problems finding VTT which is what I assume you need to increase with bckl increases

You can try 101MHz
 
For BClock use VCCIO and VSA, but truthfully you likely will not need to increase any voltages.

for some reason both Z68 and Z77 undercock the BCLK slightly, perhaps it's related to some spread spectrums that are turned on by default and not an option to change in BIOS?
 
usually changing BCLK clock in BIOS from 10000 to 10033 (actual 100.33MHz) or 10025 value  in BIOS fixes it.
minimal bump in VCCSA might be needed to calm the stability issues. that's what I did on Z68 when trying to hit the 5000MHz mark.
 
Delirious, the old VTT/QPI is now the VCCSA (for all I/O devices) and VCCIO (for memory controller).
old FSB is now called BCLK. leave other voltages stock, I never had to touch anything else, generally the whole overclocking is done by increasing multiplier and vcore, at some point vccio may need a bump especially if combined with fast running memory and 4 slots occupied. bump vccsa only at higher clocks or when upping the bclk.

I'm able to get 4.88 gb on this 3770K but that's at a 50 multiplier and a 98 bus speed.   I want to round that up to 5 in eleet but the BCLK is not allowing me even small increments.  I mean I tried 10045 and 10072 (seems to want to default to those) but It won't boot into the OS and the bios gets finicky  I have all the voltages on auto except for the DIMM and CPU.   Even that small and I can't figure it out.  I did try 11000 and no dice.   So, I want to take the voltage off manual and try putting in a static value.  How did you do this Jacob?  Yours reads 100 and mine doesn't, Did you do anything different to the BCLK?  Voltage?
 
I might even reduce the multiplier and try higher BCLK because I'm raising BCKL in addition to the already high overclock.

Yes I increased the bclock just a tad.
 
Try 10100. May even try 10200

EVGA_JacobF


Yes I increased the bclock just a tad.

Try 10100. May even try 10200

So, you are leaving voltages on auto then?
 
I am very pleased with this board.  Last night I worked about 4 hours and took it to 4.8 stable and booted in with 5 ghz but have not stability tested that yet.  4.8 was 1.4 volts and 5 is taking 1.5  4.88 has a core max of 82 C.  Hot I know but maybe I can push it to 5ghz.

up the vccsa when upping bclk at same time. vccio may need a bump too. what BSOD numbers are you getting?

feniks


up the vccsa when upping bclk at same time. vccio may need a bump too.

I will do that tonight when I get home.   It just needs to be fine tuned.

I can't even bump the bclk even a little bit, every time I try to increase it the board will not boot and I have to clear cmos.

^is that with VCCSA voltage bumped up as well?
 
EDIT:
in Z77 FTW BIOS it is called CPU VSA, not VCCSA as it used to be in Z68 FTW. it should be the same thing, a System Agent voltage.

feniks


^is that with VCCSA voltage bumped up as well?

EDIT:
in Z77 FTW BIOS it is called CPU VSA, not VCCSA as it used to be in Z68 FTW. it should be the same thing, a System Agent voltage.

 
The VCCSA was at default of 1.250v. I am going to try and bump it up now and see what happens.

1.25v default for vccsa is not ... it should be around 0.94v or so.
 
anyways while bumping up bclk you may need both vcore bump (faster effective speed of cpu clock) and vccsa/cpuvca (system agent responsible for all other devices running off BCLK). it may also need a vccio (memory controller) bump as well since the memory is tied to bclk as well.
 
it's just like overclocking an old Q9450 by upping FSB (now BCLK), you pretty much need to up all voltages to make it working hehe.
 
if you can't up the bclk no matter what then maybe your cpu doesn't like it ...what post code error are you getting when it locks up before OS boots?

I jump bumped my VSA to 1.270v and now I can boot into windows with the bclk at 10039. The VSA should be at 0.94v? Why does the bios set it to 1.250v on default?

The voltage may be increased if you have high speed memory. (Voltage gets raised automatically to improve stability)

EVGA_JacobF


The voltage may be increased if you have high speed memory. (Voltage gets raised automatically to improve stability)

 
thanks. it's interesting. so you guys incorporated such mechanism in z77 BIOS to improve stability with high speed mem sticks or it's a generic z77 thing?

It really is needed for higher speed memories. It is up to the MB vendors (like EVGA) to implement this. XMP can also adjust some of these if enabled.

I also can't raise BCLK one little bit. Right now I'm completely prime95 stable at 4.8 ghz. I'm going to watch you guys. I have g skill 2666 and cant also get it higher than 2133 but I haven't touched any other voltage than dimm. I'm betting that you have to lower your memory speed prior to bumping up BCLK prior to raising it because BCLK pretty much bumps up everything.

4.8 is 1.325 vcore - average core temp is 77 C
4.9 is doable but temps reach 85 and that's my cutoff

EVGA_JacobF


It really is needed for higher speed memories. It is up to the MB vendors (like EVGA) to implement this. XMP can also adjust some of these if enabled.

 
I hear you. it's interesting, because I found that for long term silk smooth stability of my 4x4gb memory @ 2133MHz even on Z68, I need to up vccsa by 1 notch from stock setting (and of course I run much higher than stock vccio voltage).
another instance when I had to up the vccsa as a must was when stabilizing (under LinX) my 2600K @ 5GHz, it didn't want to run stable until vccsa was upped, and that was with my memory doing 1600Mhz at same time.

When running my bclk at 10039 my system runs sluggish (I can feel lag while scrolling on web pages) What would cause this?
 
Update: Fixed by bumping PCH a bit.

Delirious


I also can't raise BCLK one little bit. Right now I'm completely prime95 stable at 4.8 ghz. I'm going to watch you guys. I have g skill 2666 and cant also get it higher than 2133 but I haven't touched any other voltage than dimm. I'm betting that you have to lower your memory speed prior to bumping up BCLK prior to raising it because BCLK pretty much bumps up everything.

I've tested about 15 IB CPU's so far, and have had several that couldn't run with memory that high.  Kind of luck of the draw with the IMC as well the cores.
 
My best IMC could do ~3000MHz and the worst was similar to yours, being stuck around 2133-2200 or so.

Do you think that's hardware related like CPUs running high clocks?  Or can this be overcome by VCCIO voltage.  I'm curious to know what VCCIO voltage you had to use to get 3000....Or what voltage I should shoot for.   I think it being 4 dimms is the problem.  I'm looking at getting replacements but if you say on some hardware it's just not possible, then there ya go.