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Unstable i5 2500k system at base clock (reboots)

post #1 of 6
Thread Starter 
Hi all,

This is the first machine I build and I am in dire need of assistance.
My computer became unstable after I tried overclocking it to 4.0GHz following this guide: http://www.clunk.org.uk/forums/overc...beginners.html
So I reset the mobo CMOS using the jumper function to guarantee all setting would come back to default. The problem is that the computer kept unstable even after setting it to base clock. I ran tests and play games (to test) and I'll get system reboots when the system is under stress. Here's the list of what I did so far:
- The system reboots when I'm testing Large FFTs on Prime95 after not even 2 minutes.
- I ran Small FFTs for more than 2 hours on Prime 95 and it remained stable. I even ran it along with OCCT for some time just to push it even further and it didn't reboot.
- Also ran IntelBurnTest on high and it passed the 5 tests.
- FurMark Burntest for around 1 hour - GPU reached 79 celcius max (75 avg.)
- I ran memtest overnight and it passed 5 times. Factory defaults 9-9-9-27-1 (1.65v). I just changed the last number to 2 since a friend recommended.
- Play Witcher 2 and DiRT 3 - the system will reboot itself after playing from 15 to 45 minutes. Also, I noticed that on DiRT3 the game sometimes gets "jumpy" (like 2 FPS) for a few seconds. I also saw some pink artifacts when crashing on walls with the car when my pc was still overclocked.


Note that I probably did not fry anything since CPU Vcore was never set above 1.3v when overclocked to 4.0GHz. Also, 1.70v was the highest I went with memory.

This is my system spec:

- COOLER MASTER Hyper 212 Plus- http://www.newegg.com/Product/Produc...82E16835103065

- Western Digital Caviar Black WD1002FAEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s- http://www.newegg.com/Product/Produc...82E16822136533

- Kingston HyperX 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) - http://www.newegg.com/Product/Produc...82E16820104173

- Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) 4 x 256KB L2 Cache 6MB - http://www.newegg.com/Product/Produc...82E16819115072

- Antec EarthWatts EA750 750W Continuous Power ATX12V version 2.3 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC "compatible with Core i7/Core i5" Power Supply - http://www.newegg.com/Product/Produc...82E16817371026

- SAPPHIRE 100312-3SR Radeon HD 6950 Dirt3 Edition 2GB 256-bit GDDR5 PCI Express 2.1 - http://www.newegg.com/Product/Produc...82E16814102945

- ASUS P8P67 PRO - http://www.newegg.com/Product/Produc...82E16813131771

- COOLER MASTER HAF 912 - http://www.newegg.com/Product/Produc...82E16811119233
Any ideas of what's going on?

If someone could please help me out it would be great!

thanks in advance
Edited by Akae - 8/20/11 at 11:01am
post #2 of 6
Thread Starter 
update:
ok, so i changed the memory voltage to 1.5 and I could run a large FFT test for almost 24 hours. Sweet. I think I might have figured the issue. going to run more tests and post results.
any ideas/suggestions/opinions?
post #3 of 6
none of your links work
it looks alive
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Sandy Transformed
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CPUMotherboardGraphicsRAM
i5 2500K [5ghz 1.44v 24/7] Asus Maximus IV Extreme SLI GTX 460 @ 920/1840/4100 [1.11v] 4GB Dominator GT @ 2133mhz CL8 [1.65v] 
Hard DriveHard DriveCoolingOS
Intel X25-M G2 80GB 3x Samsung F3 500GB RAID 0 EK Supreme HF Full Copper Windows 7 Ultimate 64bit 
MonitorPowerCaseAudio
LG42SL9500 42" 1080p [Surround Soon] XFX XXX Edition 650w Xigmatec Elysium JVC HA-RX700 [foam mod] 
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it looks alive
(17 items)
 
Sandy Transformed
(69 photos)
 
CPUMotherboardGraphicsRAM
i5 2500K [5ghz 1.44v 24/7] Asus Maximus IV Extreme SLI GTX 460 @ 920/1840/4100 [1.11v] 4GB Dominator GT @ 2133mhz CL8 [1.65v] 
Hard DriveHard DriveCoolingOS
Intel X25-M G2 80GB 3x Samsung F3 500GB RAID 0 EK Supreme HF Full Copper Windows 7 Ultimate 64bit 
MonitorPowerCaseAudio
LG42SL9500 42" 1080p [Surround Soon] XFX XXX Edition 650w Xigmatec Elysium JVC HA-RX700 [foam mod] 
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post #4 of 6
Thread Starter 
Quote:
Originally Posted by munaim1 View Post
none of your links work
fixed. sorry about that.
post #5 of 6
Really looks like the memory, it's a 1.65V kit which will work fine, but likely needs more than 1.5V to run it's rated speed & timings.
    
CPUMotherboardGraphicsRAM
i7 990x/3930k/3770k/4770k GB x58a-OC/Asus RIVE/x79 gd65/z77 mpower/z77 MV... gtx480s/gtx580s/7970s/680s/Titan Hyper/PSC/BBSE/Hynix/Samsung 
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CPUMotherboardGraphicsRAM
i7 990x/3930k/3770k/4770k GB x58a-OC/Asus RIVE/x79 gd65/z77 mpower/z77 MV... gtx480s/gtx580s/7970s/680s/Titan Hyper/PSC/BBSE/Hynix/Samsung 
Hard DriveOptical DriveCoolingOS
HDDs/SSDs DVD Air/water/phase/copper pot Windowz 
MonitorKeyboardPowerCase
samsung 2320 Razer Lycosa ax1200 carboard box 
Mouse
Trackball 
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Reply
post #6 of 6
Thread Starter 
ok so after playing Dirt3 for half hour, I still notice "jumpy" frames and some pink artifacts tears on the screen sometimes when my car crashes or hit a tree. The computer did not reboot during the time I was playing, but again, it was just for 30 minutes.
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