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Trying to get my 2500K to 4.5Ghz

post #1 of 8
Thread Starter 
Some background info:
This is a brand new system, however I bought the CPU in Jan/Feb (it had been idling in my HTPC until last week).

System:
2500K @ 4.5Ghz (not quite stable yet)
H212 EVO cooler with 2x CM fans (in push / pull config) turned down all the way to 1100RPM.
Thermal compound: MX-4
Corsair 500R case with 7 fans (positive pressure build)
ASRock P67 Extreme4 Gen 3 mobo

Testing:
I'm using prime95 blend with IntelBurnTest for validation.

My 4.5Ghz attempts:
1st try @ 1.32V: Prime95 failed with rounding error after 3 hours:
2nd try @ 1.33V: Prime95 failed with CRC error after 5.5 hours:
3rd try @ 1.34V: Prime95 failed with rounding error after 15 hours
4th try @ 1.35V: Testing now ...

My temps are OK, not great, but not terrible either. During Prime sessions they max out at 65C. IBT adds about 5C to that baseline. What's interseting is that the CPU always fails in Core0, which is also the coolest one (by 4C).

Let's say the 1.35 proves to be stable for 18-24 hours. Is this a stable system (assuming that no crashes / errors from other sources)? Or should I just back down to 4.3-4.4Ghz with more reasoable voltages.
post #2 of 8
1.35V is very safe and so is 65-70°C, so shooting for 4.5 GHz is a great idea. It's the most common overclock for the 2500K/2600K.

If it can last 18-24 hours in Prime95's Blend test (of course, it must be Blend for Sandy Bridge), then that's rock-solid stable. However, if you are using an Offset voltage, then you may get BSOD's or lock-ups either while idling or during very low-load moments. The way to avoid that (if you're using an Offset) is by disabling "C3" and "C6".

Nice work so far, by the way!
Edited by TwoCables - 11/7/11 at 10:32am
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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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It's a computer!
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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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post #3 of 8
You are very close. A little more Vcore is all it needs. If 1.350v passes 18hrs, I'd call it stable.
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Red X9
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Corsair Vengence Pro 32gig 2400mhz c11 red (4x8... 6x 256gig (1.5tb) in Raid 0 , OS / Gaming Drive 2 x Liteon 256gig (512gig) storage drives Asus Dvd-RW 
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post #4 of 8
if you wanna drop temps alittle... drop your pll to 1.7 i would also set your vtt to around 1.14 and pll overvoltage to enabled. these settings should help stabilize you as well.
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
1.35V is very safe and so is 65-70°C, so shooting for 4.5 GHz is a great idea. It's the most common overclock for the 2500K/2600K.

If it can last 18-24 hours in Prime95's Blend test (it must be Blend for Sandy Bridge), then that's rock-solid stable. However, if you are using an Offset voltage, then you may get BSOD's or lock-ups either while idling or during very low-load moments. The way to avoid that (if you're using an Offset) is by disabling "C3" and "C6".

Nice work so far, by the way!
Thanks

I'm using fixed voltage settings. I set the LLC to level 2 (this setting on my mobo ranges from 1 - 5 or disabled - 1 producing least amount of voltage drop). As far as testing - I always run IBT for 10 or so minutes (10 tests @ 4GB). If I get no errors I proceed to run the blend test. At the same time I try to use the machine for every day stuff (browsing, email) while "priming" .
post #6 of 8
I am now sitting pretty at 1.356v for 4.8GHz.

1.35v should do well for you. Like others said, don't forget the VCCIO and VTT voltages.

I use offset mode and had to bump up the offset due to low voltage when idling.
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Steak_N_Eggs
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post #7 of 8
Thread Starter 
Quote:
Originally Posted by Tipless View Post
if you wanna drop temps alittle... drop your pll to 1.7 i would also set your vtt to around 1.14 and pll overvoltage to enabled. these settings should help stabilize you as well.
PLL overvoltage is enabled, not sure what my other settings are. Will check / make changes when I get home.
post #8 of 8
Internal PLL Overvoltage isn't needed for 4.5 GHz. Disabling it will reduce the POST time slightly as well.
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
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