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First-ever (and successful?) OC to 4.8, but w/cooling concerns

post #1 of 4
Thread Starter 
This is my first-ever overclocking attempt, and while I'm semi-happy with it overall, I'd like some input from those with more experience than me regarding 100% load cycle temps.

==================================================

BUILD SPECS:

Case: Rosewill Challenger
Intel Core i5-2500K 3.3 (w/4.8 OC)
Asus Sabertooth P67 (Rev. 3.0) - 1502 BIOS
PSU: Antec High Current Gamer Series HCG-900 900W (bottom intake, rear exhaust)
GPU: GeForce GTX 560Ti 1GB
Cooler Master Hyper 212+ (single 120mm push fan)
Corsair Vengeance DDR3 1600 (4 x 4GB)
Boot drive: Corsair M4 128GB SSD
Storage: 2 x Seagate Barracuda 7200.12 500GB SATA 6.0Gb/s; 2TB Western Digital Elements external USB
Win7 Home Premium 64-bit

Fans:
120mm front intake
120mm rear exhaust
120mm side intake
140mm top exhaust
120mm CPU cooler (push mode, aimed towards rear exhaust)
50mm motherboard assist

==================================================

I just built this new rig a week ago, and decided a couple days ago to try overclocking. Being a total newbie at this, I have very little understanding about such things. However, using the Asus UEFI and following a guide on another forum that was written by an Asus rep, I have my i5-2500K overclocked to 4.8 with the following specs:

Turbo Ratio: By Per Core (set to 48 on all four)
Internal PLL Overvoltage: Auto
Load-line Calibration: Ultra-High
VRM Fixed Frequency Mode: 350
Duty Control: T.Probe
CPU Voltage: Manual Mode @ 1.425

So...the rig runs well, and after giving it a full day doing light-duty stuff, I decided to hit it with Prime95 to see just how stable it would be. I ran it for almost two hours and got no errors, but the temperatures were a bit higher than I'd like to see, as reported by Real Temp. With idle temps about 38C and the ambient room temp about 75F, the workout with Prime95 was pushing the core temps into the mid-to-upper 70s, with a few seconds getting into the low-to-mid '80s...and a couple short spikes hitting 85C. It would only hit that 85C for a couple seconds, and then drop back down to the upper-70s. However, at 85C my motherboard flashed an on-screen warning at me, and even though the temps mostly leveled-off in the upper-70s, I decided to stop the test. Within 3-4 seconds the temps had returned to 38C.

Since the Hyper 212+ only had a single push fan, and I had several other new fans to use, I decided to try adding a second pull fan. The CoolerMaster fan that came with the Hyper 212+ has a 4-pin mobo header connector and a Molex connector for a 2-pin fan, so I hooked the second pull fan to the Molex connector, so that both fans were being powered by the same mobo header...and then fired things up again. However, the temps rose even faster than before and mostly leveled off in the low-80s, but again hitting the 85C mark pretty quickly, so I again shut it down. I removed the second pull fan and fired it up again...and found the temps didn't rise as quickly, but I was still bumping into the upper-70s and low-80s.

After thinking about it, I decided that maybe the cause of the slightly-higher temps with the second pull fan was because it was a different brand (Rosewill, that came with the case), and was possibly running at a slightly different RPM, essentially causing an airflow obstruction. So I'm thinking that I might have better luck running two identical CoolerMaster fans, running both 4-pin fans off the same mobo header with a splitter. (The Asus manual states this header can handle 1A (12W).) However, the reading I've done suggests that a second fan might only drop the temps a couple degrees at most, and probably isn't worth the trouble overall.

FYI: I did remove the cooler, cleaned it and the CPU up and checked for straightness, then reapplied the paste and reinstalled. Idle temps remained the same at 38C.

Another thought I had was possibly dropping the Vcore voltage down a bit, thinking that less voltage would equal less heat. Am I thinking right? What voltage setting would you recommend I start with?

I know that with how I use my computer, I'll virtually never see a 100% duty cycle, even with some mild gaming that I might occasionally do, so I'd probably be OK, but if I decide to try bumping the OC up some more just to see what it's capable of, the cooling issues will need to be dealt with first. Then I can continue learning as I go. I'd definitely appreciate any input I can get. Thanks!


    
CPUMotherboardGraphicsRAM
i5 2500K 3.3GHz (@ 4.8GHz) Asus Sabertooth P67 (Rev3) Gigabyte GeForce GTX 560Ti 4 x 4GB Corsair Vengence DDR3 1600 
Hard DriveOptical DriveOSMonitor
2 x 500GB SG Barracuda; 2TB WD; Crucial 128GB SSD ASUS 24X Sata DVD Burner Win 7 x64 AOC 21" LCD 
KeyboardPowerCaseMouse
Gigabyte GK-K6800 Antec High Current Gamer Series 900W Rosewill Challenger (soon w/window) Gigabyte GM-M6800 optical USB 
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CPUMotherboardGraphicsRAM
i5 2500K 3.3GHz (@ 4.8GHz) Asus Sabertooth P67 (Rev3) Gigabyte GeForce GTX 560Ti 4 x 4GB Corsair Vengence DDR3 1600 
Hard DriveOptical DriveOSMonitor
2 x 500GB SG Barracuda; 2TB WD; Crucial 128GB SSD ASUS 24X Sata DVD Burner Win 7 x64 AOC 21" LCD 
KeyboardPowerCaseMouse
Gigabyte GK-K6800 Antec High Current Gamer Series 900W Rosewill Challenger (soon w/window) Gigabyte GM-M6800 optical USB 
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post #2 of 4
Definitely try to lower the vcore, it is the main cause for the temperature. Also when you would run IBT the temperatures are likely to go even higher.
I can't really recommend a vcore voltage as it changes on a per chip bases, I use 1.295 for my 4.5GHz. About the fans try switching their positions and such and find the best configuration.
Edited by grivy - 11/3/11 at 12:40pm
yes
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500k @ 4.5GHz Asus P8Z68-V IGP HD3000 @ 1.9GHz  Kingston 8 GB 1600 
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 3  Samsung EG 2TB WD Red 3 TB Samsung SH-S223C 
CoolingOSMonitorKeyboard
Scythe mugen 2 Rev. B Windows 8 Pro LG 32LG3000 Logitech K360 Purple Boulder 
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Antec Basiq BP550Plus Xigmatek Midgard Logitech MX Air 
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yes
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CPUMotherboardGraphicsRAM
Intel Core i5 2500k @ 4.5GHz Asus P8Z68-V IGP HD3000 @ 1.9GHz  Kingston 8 GB 1600 
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 3  Samsung EG 2TB WD Red 3 TB Samsung SH-S223C 
CoolingOSMonitorKeyboard
Scythe mugen 2 Rev. B Windows 8 Pro LG 32LG3000 Logitech K360 Purple Boulder 
PowerCaseMouse
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post #3 of 4
Well 1.375v is Intel's max rated voltage. At this point you may need a better air cooler. Like NH-D14 or Silver arrow. Those coolers beat even corsair's H80. So hyper 212+ is a nice cooler but it isn't enough for 4.8ghz.
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CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
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WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
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Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
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logitech mx air None Monsoon MM-700 
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Sandy Thunder
(18 items)
 
QuickSilver X1
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
AudioOther
Bose Music Monitor Nuforce Icon HDP 
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
MouseMouse PadAudio
logitech mx air None Monsoon MM-700 
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post #4 of 4

hi i found this a while ago,

hope it helps to push your chip to outer limits


Edited by justanewguy - 11/3/11 at 1:14pm
HAF silent-X
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CoolingOSMonitorPower
Thermalright Archon PP 2x TY-140 Win7 x64 Enterprise Sony 42" LED Backlight LCD TV 1080p HD+ Seasonic M12D 850W 80+ Gold 
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Cooler Master HAF-X Scythe Kaze Master 
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HAF silent-X
(18 items)
 
chargin ma lazor
(12 photos)
Nibble the World!
(1 photos)
CPUMotherboardGraphicsGraphics
Intel Xtreme QX9770 @4GHz Asus P5Q3 Deluxe Sapphire HD 6970 2GB cooled by Alpenföhn Peter 
GraphicsRAMHard DriveHard Drive
Sapphire HD 6950 @ 6970 [for sale] 16GB Geil Value Plus DDR3 @1600Mhz Corsair Force GT 240GB SSD SAMSUNG SpinPoint F3 7200 
CoolingOSMonitorPower
Thermalright Archon PP 2x TY-140 Win7 x64 Enterprise Sony 42" LED Backlight LCD TV 1080p HD+ Seasonic M12D 850W 80+ Gold 
CaseOther
Cooler Master HAF-X Scythe Kaze Master 
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