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Can't reach 4.5 no matter what I do

post #1 of 14
Thread Starter 
Am I just unlucky? My usual OC is at 4.4 with offset -0.015v(1.224-1.232v), completely rock solid stable, and I don't know if it's my CPU or mobo, but something about 4.5, my system just does not like. I would be getting horrid missing textures and visual artifacts to the point of not being able to see anything in game(Far Cry 3), system freezes, even when getting into UEFI the screen is all black and as I move my mouse it would clear the picture where the mouse would be moved but would still be frozen and couldn't choose options.

Also, it took offset +0.025(1.264-1.280v) just to be able to stay in windows as well, so that's a hefty jump in voltage. Had to use reset bios button, and now I'm back at my 4.4 OC which I guess is fine, but the number 4.5 just looks so much more aesthetically pleasing to me haha. So anyone have insight on what's stopping me here?
Edited by venomblade - 2/2/13 at 8:41pm
post #2 of 14

This is fairly normal.  When I take my 2500K from 4.7 GHz to 4.8, I have to increase the voltage from 1.376V to 1.408V.

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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

This is fairly normal.  When I take my 2500K from 4.7 GHz to 4.8, I have to increase the voltage from 1.376V to 1.408V.

Dang, so I really am lacking in the amount of voltage I've chosen for 4.5 huh. If that's the case I'll most likely stay at 4.4. With voltage that high at 4.5 my temps weren't to my liking when priming,(85c max) With my current OC I hit 75c in prime and rarely 70 in games, so I guess I'll just be content with what I've got until I feel it's necessary to get better cooling.
post #4 of 14
Quote:
Originally Posted by venomblade View Post


Dang, so I really am lacking in the amount of voltage I've chosen for 4.5 huh. If that's the case I'll most likely stay at 4.4. With voltage that high at 4.5 my temps weren't to my liking when priming,(85c max) With my current OC I hit 75c in prime and rarely 70 in games, so I guess I'll just be content with what I've got until I feel it's necessary to get better cooling.

 

Yeah, I guess that's not a bad idea.  :/

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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #5 of 14
That sounds like bad luck on the chip. Mine runs 4.3 @ 1.14-1.15 rock solid. Havent really tried for more yet since I just got my new HSF. Temps max at about 58C hottest core in prime95. It will boot at that voltage at 4.4 but eventually locks up.
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by batman900 View Post

That sounds like bad luck on the chip. Mine runs 4.3 @ 1.14-1.15 rock solid. Havent really tried for more yet since I just got my new HSF. Temps max at about 58C hottest core in prime95. It will boot at that voltage at 4.4 but eventually locks up.

Yea I see people all around hitting the same clocks as me with much lower voltage, guess I am just unlucky. Went thru nearly 3 PSUs within two weeks because they all had horrid cases of coil whine, and I got a "dud" 560ti that couldn't even hit 940mhz on the core when the model I had was notorious for hitting 1ghz. Don't think I'm a winner in the silicon lottery haha.
Edited by venomblade - 2/2/13 at 10:24pm
post #7 of 14
Might try playing with your cpu pll i could't get 5ghz stable till i lowerd my pll to 1.65, but from 4800@1.416 5ghz needs 1.48-1.50 to be stable sometimes cpus need a huge bump to run a little faster.
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SABERWOLF
(18 items)
 
XEON-WOLF
(18 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7-6800K MSI X99A GAMING PRO CARBON EVGA GTX 1080 FTW Hydro Copper G.SKILL TridentZ Series 
Hard DriveCoolingCoolingCooling
Samsung EVO 850 500 EK-SBAY Dual DDC 3.2 PWM Serial Alphacool NexXxoS ST30 Full Copper Radiator 360 Hardware Labs Black Ice SR2 Multiport Black Car... 
CoolingCoolingOSMonitor
EK-CoolStream RAD XTC 420 koolance 380i Windows 10 Pro ASUS VW246H Black 24" 2ms 
PowerCaseMouseAudio
SeaSonic M12D SS-850 850W  Thermaltake core x71 CM Storm Sentinel Advance II Corsair Void 
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RAMHard DriveHard DriveHard Drive
F3-12800CL9S-4GBRL WDC WD1001FALS-00J7B1 ST31000340AS WDC WD7500AAKS-00RBA0 
Hard DriveOptical DriveCoolingOS
Hitachi HDS723020BLA642 ihas 624-A SilverStone Heligon HE01 windows 10 64 Pro 
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post #8 of 14
Try enabling Internal PLL Overvoltage, if it isn't already. It can often help you get through a wall like you are experiencing.
post #9 of 14

I thought that Internal PLL Overvoltage is only needed if Windows won't start at higher multipliers.

It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #10 of 14
I've also seen it help in situations where the next multiplier isn't stable even with a crazy amount of additional Vcore. So, for example, if you can get 4.7 at 1.35V but 4.8 takes 1.45, sometimes Internal PLL Overvoltage helps there. Sometimes let you grab an additional multiplier or two.

I agree that you normally wouldn't need it at just 4.4~4.5 though.
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