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Best way to test for CPU vcore stability

post #1 of 7
Thread Starter 
I've seen too many guides with too many different information: I've heard Prime95 large FFT will be best, I've also heard small FFT and then I've heard Blend test.

What I have done is run Large FFT set to 5 min intervals for 8 HRs and its been stable. But then I read that Large FFT failures are due to low VTT settings (my RAM is overclocked to its standard 1600MHz rating). So now I bumped down my VCore and upped my VTT.

I am now following this guide http://www.overclock.net/t/838244/prime95-a-quick-dirty-guide-to-the-custom-settings that says to do a custom setting where I run 20K in place FFT for 2 hours to do a CPU focused test.

What is the best way of checking my CPU and Ram stability? After this custom run, I intend on doing Memtest for 5 hours while I'm gone at school and seeing what happens. Does this sound about right?

My processor is the i7-930. Yes I realize its not what most people here have and I have looked at the guide to OC'ing it but I feel it might be too general?
post #2 of 7
You must let Prime 95 complete all the tests. That takes about 23 hours. Others will say stable is after 8 hours, 12 hours (myself included) ,and so on. The quick and dirty guide is extremely helpful,but... ONLY to find the limits of the overclock you plan to do. Every test stresses different parts of hardware,so it would be prudent to run ALL of them.
thumb.gif
   
Frappenstein
(12 items)
 
CPUMotherboardGraphicsRAM
Phenom ii x4 965 BE GA-MA-790FXT-UD5P Sapphire R9 290 Tri-x OC Kingston Value RAM 
RAMHard DriveHard DriveOptical Drive
Kingston Value RAM Seagate Barracuda (Died) WD Caviar Black Sony DVD/RW 
Optical DriveCoolingOSMonitor
Sony DVD/RW Xigmatec Aegir SD128264 Win 7 Home Premium 64 bit LG 2443T 
PowerCase
ThermalTake Toughpower 800 (Non modular) ThermalTake Eureka 
CPUMotherboardGraphicsRAM
Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
Hard DriveOptical DriveCoolingOS
Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
MonitorKeyboardPowerCase
15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
CPUMotherboardGraphicsRAM
5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
Hard DriveHard DriveCoolingOS
Intel 750 Series 400GB WD Caviar Black 1 Tb H-100i Win 7 64 bit Ultimate 
PowerCase
Super Flower 1600W Platinum Coolermaster Cosmos2 
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Frappenstein
(12 items)
 
CPUMotherboardGraphicsRAM
Phenom ii x4 965 BE GA-MA-790FXT-UD5P Sapphire R9 290 Tri-x OC Kingston Value RAM 
RAMHard DriveHard DriveOptical Drive
Kingston Value RAM Seagate Barracuda (Died) WD Caviar Black Sony DVD/RW 
Optical DriveCoolingOSMonitor
Sony DVD/RW Xigmatec Aegir SD128264 Win 7 Home Premium 64 bit LG 2443T 
PowerCase
ThermalTake Toughpower 800 (Non modular) ThermalTake Eureka 
CPUMotherboardGraphicsRAM
Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
Hard DriveOptical DriveCoolingOS
Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
MonitorKeyboardPowerCase
15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
CPUMotherboardGraphicsRAM
5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
Hard DriveHard DriveCoolingOS
Intel 750 Series 400GB WD Caviar Black 1 Tb H-100i Win 7 64 bit Ultimate 
PowerCase
Super Flower 1600W Platinum Coolermaster Cosmos2 
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post #3 of 7
Thread Starter 
WHich one should I run for 24 hrs to check for system stability. I guess I'm more worried about Vcore since its the cause for 90% of all failures
post #4 of 7
Run blend,it tests everything. Up the Vcore a bit,and test again. And only mess around with one voltage at a time,otherwise you will need to Clear CMOS and start over.
   
Frappenstein
(12 items)
 
CPUMotherboardGraphicsRAM
Phenom ii x4 965 BE GA-MA-790FXT-UD5P Sapphire R9 290 Tri-x OC Kingston Value RAM 
RAMHard DriveHard DriveOptical Drive
Kingston Value RAM Seagate Barracuda (Died) WD Caviar Black Sony DVD/RW 
Optical DriveCoolingOSMonitor
Sony DVD/RW Xigmatec Aegir SD128264 Win 7 Home Premium 64 bit LG 2443T 
PowerCase
ThermalTake Toughpower 800 (Non modular) ThermalTake Eureka 
CPUMotherboardGraphicsRAM
Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
Hard DriveOptical DriveCoolingOS
Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
MonitorKeyboardPowerCase
15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
CPUMotherboardGraphicsRAM
5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
Hard DriveHard DriveCoolingOS
Intel 750 Series 400GB WD Caviar Black 1 Tb H-100i Win 7 64 bit Ultimate 
PowerCase
Super Flower 1600W Platinum Coolermaster Cosmos2 
  hide details  
Reply
   
Frappenstein
(12 items)
 
CPUMotherboardGraphicsRAM
Phenom ii x4 965 BE GA-MA-790FXT-UD5P Sapphire R9 290 Tri-x OC Kingston Value RAM 
RAMHard DriveHard DriveOptical Drive
Kingston Value RAM Seagate Barracuda (Died) WD Caviar Black Sony DVD/RW 
Optical DriveCoolingOSMonitor
Sony DVD/RW Xigmatec Aegir SD128264 Win 7 Home Premium 64 bit LG 2443T 
PowerCase
ThermalTake Toughpower 800 (Non modular) ThermalTake Eureka 
CPUMotherboardGraphicsRAM
Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
Hard DriveOptical DriveCoolingOS
Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
MonitorKeyboardPowerCase
15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
CPUMotherboardGraphicsRAM
5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
Hard DriveHard DriveCoolingOS
Intel 750 Series 400GB WD Caviar Black 1 Tb H-100i Win 7 64 bit Ultimate 
PowerCase
Super Flower 1600W Platinum Coolermaster Cosmos2 
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Reply
post #5 of 7
For me, if i can game and benchmark, it's stable.thumb.gif
post #6 of 7
Quote:
Originally Posted by JulioCesarSF View Post

For me, if i can game and benchmark, it's stable.thumb.gif
Agree and not agree. Nobody other than yourself can say if you are stable or not. BUT if the system is not stable even though it seems to be ok, corrupt data will start to be written in your HDD/SSD etc,and eventually you will need to format. thumb.gif
   
Frappenstein
(12 items)
 
CPUMotherboardGraphicsRAM
Phenom ii x4 965 BE GA-MA-790FXT-UD5P Sapphire R9 290 Tri-x OC Kingston Value RAM 
RAMHard DriveHard DriveOptical Drive
Kingston Value RAM Seagate Barracuda (Died) WD Caviar Black Sony DVD/RW 
Optical DriveCoolingOSMonitor
Sony DVD/RW Xigmatec Aegir SD128264 Win 7 Home Premium 64 bit LG 2443T 
PowerCase
ThermalTake Toughpower 800 (Non modular) ThermalTake Eureka 
CPUMotherboardGraphicsRAM
Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
Hard DriveOptical DriveCoolingOS
Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
MonitorKeyboardPowerCase
15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
CPUMotherboardGraphicsRAM
5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
Hard DriveHard DriveCoolingOS
Intel 750 Series 400GB WD Caviar Black 1 Tb H-100i Win 7 64 bit Ultimate 
PowerCase
Super Flower 1600W Platinum Coolermaster Cosmos2 
  hide details  
Reply
   
Frappenstein
(12 items)
 
CPUMotherboardGraphicsRAM
Phenom ii x4 965 BE GA-MA-790FXT-UD5P Sapphire R9 290 Tri-x OC Kingston Value RAM 
RAMHard DriveHard DriveOptical Drive
Kingston Value RAM Seagate Barracuda (Died) WD Caviar Black Sony DVD/RW 
Optical DriveCoolingOSMonitor
Sony DVD/RW Xigmatec Aegir SD128264 Win 7 Home Premium 64 bit LG 2443T 
PowerCase
ThermalTake Toughpower 800 (Non modular) ThermalTake Eureka 
CPUMotherboardGraphicsRAM
Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
Hard DriveOptical DriveCoolingOS
Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
MonitorKeyboardPowerCase
15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
CPUMotherboardGraphicsRAM
5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
Hard DriveHard DriveCoolingOS
Intel 750 Series 400GB WD Caviar Black 1 Tb H-100i Win 7 64 bit Ultimate 
PowerCase
Super Flower 1600W Platinum Coolermaster Cosmos2 
  hide details  
Reply
post #7 of 7
In my opinion it is not worth going too OCD with Prime95. A system that passes 24h of test is no more stable than one that passes 4h. What about if you stop the test at 24h just before an error would have been detected at 24h and 1 minute? Would that make the system "unstable"? When do you stop then?

In my experience over the years I found that once I pass an arbitrary and reasonable limit of stress testing, then I am good to go UNLESS instability is showing in real life usage (games, and apps in daily usage). This is the guideline I use when I OC my systems and never had a problem:

- Run Linx (with the latest Linpack) for about an hour or 10 cycles of 8GB. That will generate the most heat out of the CPU as well as the highest vdrop. If you pass this...
- Run Prime95 blend test for a couple of hours. This usually catches most of the instability of both CPU and RAM. If you pass this...
- Play games and run the software you normally use. If everything works, then you are good if not rinse and repeat.

I'm not saying this is the ultimate guide to OC testing (nobody can make that claim), but this is what has been working for me for many years from Athlon XP to Core i7.
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