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2500k stable at 4.3ghz. No post at 4.4ghz. I'm confused.

post #1 of 5
Thread Starter 
I've been raising my clocks about 200mhz at a time today and I've been able to do 5-round max ram IBT runs all the way up to 4.3ghz. Up until now, everything in the bios of my ASRock Extreme7 Gen3 mobo is at auto or stock except the ram which I have set to 1333mhz for now.

Setting the CPU multiplier to 44x results in no post. I've set Vcore up to 1.3V with CPU PLL Overvoltage enabled (i.e. no vdroop) and load line calibration jacked up. Still no post.

My understanding is that I should at least get a post at these levels without much effort. What am I missing?

Temps are fine at 65C load. At 4.3ghz I see 1.28V vcore max on all auto settings.

Are the turbo duration and power settings involved in this perhaps?

Edit - I've also tried the following:

Turbo Short Duration Power Limit 250
Turbo Long Duration Power Limit 250
Core Current Limit 250
Vcore Fixed 1.35
QPI PLL 1.79
Overvoltage enabled

Still no post at 4.4ghz

CPU Batch: 3125B516
Edited by Cubemonkey - 10/6/11 at 9:18pm
post #2 of 5
Have you set your VRM Frequency to 350?

Otherwise it may just be a case of the CPU needing a higher voltage bump to hit 4.4GHz.
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My System
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CPUMotherboardGraphicsRAM
[i7 2600k - 5.XGHz @ X.XXv] [ASUS P8P67 Pro B3] [2x MSI 7970s in Crossfire @ 1125/1650] [8GB G.Skill Ripjaws X 2x4GB] 
Hard DriveHard DriveCoolingCooling
[2TB Hitachi] [Crucial M4 SSD 64GB] [Antec Kuhler H20 920] [Lian-Li BZ BZ-502B] 
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[G.Skill Turbulence II RAM Cooler] [Windows 7 Ultimate 64bit] [2x BenQ XL2410T @ 120Hz] [Razer Lycosa] 
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[Corsair AX1200] [Silverstone Raven RV02-EW] [Razer DeathAdder] [Razer Goliathus] 
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post #3 of 5
Thread Starter 
I don't even remember seeing VRM Frequency anywhere. I must have missed it. Could that really keep it from posting?
post #4 of 5
Bring vcore up to 1.4v and see if it boots. 4.4 at 1.3v isn't achievable on all chips. Also, remember silicon doesn't OC linearly. It's entirely possible you'll need a large vcore jump to go from 4.3 to 4.4. I know my 2600k hits 4.8 at 1.38v but won't stably do 4.9 till I go 1.46v, and won't hit 5.0 even with 1.5v
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Alduin-WIP
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i7-2600k GA Z68XP-UD4 MSI 6950 2gb Twin Frozr III MSI 6950 2gb Twin Frozr III 
RAMHard DriveHard DriveHard Drive
G Skill Sniper Crucial M4 256GB Spinpoint F4 2TB Spinpoint F4 2TB 
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Spinpoint F4 2TB Thermalright HR-02 Windows 7 Professional 64 bit Dell U2311H x3 Portrait Eyefinity 
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Corsair AX750 Silverstone FT02 Sleeving, acrylic, lighting and whole buncha ot... Laser Cutting and Engraving 
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post #5 of 5
Thread Starter 
Just occurred to me that's this may be a psu issue. Before I bought the new mobo and CPU, I upgraded my psu to the Corsair AX850. When I subsequently went to OC my 920, which I hadn't done in awhile...it wouldn't post. Even a light OC like 3.4ghz. I used to run it at 3.9.
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