Overclock.net › Forums › Intel › Intel CPUs › Prime95 FATAL ERROR Rounding Question
New Posts  All Forums:Forum Nav:

Prime95 FATAL ERROR Rounding Question

post #1 of 11
Thread Starter 
I've been experimenting with different FSB and multi settings and found that the best benchmark score in 3DMark06 so far is when I set FSB to 420MHz, multi 9, although I haven't yet gone over 430MHz. The highest I have had my CPU running is with 390MHz FSB, multi 10.

So I decided it was time to check stability at different settings. And I get the message below; at 430MHz FSB this occurs after 6 minutes and at 420MHz after 28 minutes and its always on core 3.

FATAL ERROR: Rounding was 0.5, expected less than 0.4 Hardware failure detected, consult stress .txt file. Etc, etc......

When running Prime96 my CPU is within Intels recommended thermal specification but there is a difference in core temps, these seem to range as follows:

CPU: between 50 and 62
Core1:between 44 and 56
Core2:between 44 and 56
Core3:between 50 and 60
Core4:between 50 and 60

My Vcore is set at 1.3625v, memory to CPU ratio is 1:1.

I haven't had time yet but I'm going to run Prime96 at stock setting to see what results I get.

Have I got a CPU with a bad core or is this quite common when overclocking, have I just got to find the sweet spot?



Blue Dragon
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Core i7-2700K Sandybridge Socket LGA1155 Asus P8Z68 DELUXE Intel Z68 (Socket 1155) DDR3 EVGA GeForce GTX 580 Superclocked with Backplate EVGA GeForce GTX 580 Superclocked with Backplate 
RAMHard DriveOptical DriveCooling
Vengeance DDR3 1866 Mhz Crucial RealSSD M4 Plextor PX-LB950SA Koolance CPU-370 
CoolingOSMonitorKeyboard
Koolance VID-NX580 Windows 7 64bit Dell Ultrasharp 24" Logitech G15 Gaming Keyboard 
PowerCaseMouse
Corsair AX1200 Corsair Obsidian 800D Logitech G5 Gaming Mouse 
  hide details  
Reply
Blue Dragon
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Core i7-2700K Sandybridge Socket LGA1155 Asus P8Z68 DELUXE Intel Z68 (Socket 1155) DDR3 EVGA GeForce GTX 580 Superclocked with Backplate EVGA GeForce GTX 580 Superclocked with Backplate 
RAMHard DriveOptical DriveCooling
Vengeance DDR3 1866 Mhz Crucial RealSSD M4 Plextor PX-LB950SA Koolance CPU-370 
CoolingOSMonitorKeyboard
Koolance VID-NX580 Windows 7 64bit Dell Ultrasharp 24" Logitech G15 Gaming Keyboard 
PowerCaseMouse
Corsair AX1200 Corsair Obsidian 800D Logitech G5 Gaming Mouse 
  hide details  
Reply
post #2 of 11
You could try to go over 430 on your FSB.
Quad Machine
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 @ 3.6Ghz @1.39v L733/ E8500 ASUS Blitz Formula SE 8800 GTS 512 G92 stable @818/1917/1107 4x1GB 800Mhz Transcend Axeram N 5-5-5-15 @1066Mhz 
Hard DriveOptical DriveOSMonitor
WD 320GB SATA II+250GB Hitachi 7200rpm IDE LG DVD-RW 3ple-Boot: SuSE 10.3 - XP x64 - Vista Ultimate x64 ASUS 22" VW222S 1680x1050 
KeyboardPowerCaseMouse
Logitech MX3000 Laser Thermaltake Toughpower 750W SLI Ready Thermaltake Armor V8003SWA with 25cm side fan Logitech G9 
Mouse Pad
Alienware 
  hide details  
Reply
Quad Machine
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 @ 3.6Ghz @1.39v L733/ E8500 ASUS Blitz Formula SE 8800 GTS 512 G92 stable @818/1917/1107 4x1GB 800Mhz Transcend Axeram N 5-5-5-15 @1066Mhz 
Hard DriveOptical DriveOSMonitor
WD 320GB SATA II+250GB Hitachi 7200rpm IDE LG DVD-RW 3ple-Boot: SuSE 10.3 - XP x64 - Vista Ultimate x64 ASUS 22" VW222S 1680x1050 
KeyboardPowerCaseMouse
Logitech MX3000 Laser Thermaltake Toughpower 750W SLI Ready Thermaltake Armor V8003SWA with 25cm side fan Logitech G9 
Mouse Pad
Alienware 
  hide details  
Reply
post #3 of 11
when you get rounding errors it an unstable o/c. your chip is probably fine, you need to bump up the vcore a notch or 2. i'm not sure what the max volts are for that QX9650, look it up, and make sure you dont go over it, you'll be fine.
My Gaming System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.0GHz @ 1.25v ASUS P6X58D-E GTX 580 Gskill 1600's 3x2 
Hard DriveOSMonitorKeyboard
2x Corsair F120's in RAID0 Win 7 Ultimate 64bit Apple 30" 2560x1600 microsoft reclusa 
PowerCaseMouse
1000w Corsair antec 1200 razer diamondback 
  hide details  
Reply
My Gaming System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.0GHz @ 1.25v ASUS P6X58D-E GTX 580 Gskill 1600's 3x2 
Hard DriveOSMonitorKeyboard
2x Corsair F120's in RAID0 Win 7 Ultimate 64bit Apple 30" 2560x1600 microsoft reclusa 
PowerCaseMouse
1000w Corsair antec 1200 razer diamondback 
  hide details  
Reply
post #4 of 11
don't be alarmed. It just means your cpu isn't stable.

Try other settings.
Just a comp.
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 GO @ 3.6 Ghz 1.48 v bios Asus P5K eVGA 9800GTX 770/1944/2300 4 GB Patriot Extreme PC2-6400 
Hard DriveOptical DriveOSMonitor
150 GB WD Raptor 500 GB Barracuda 160 GB IDE HD LITE-ON DVD-RW Dual boot Vista / XP 32 Bit Samsung 226BW 22" WS 
KeyboardPowerCaseMouse
Emachines Antec Truepower Trio 650 W Antec Nine Hundred Microsoft Comfort Optical Mouse 3000 
Mouse Pad
Regular 
  hide details  
Reply
Just a comp.
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 GO @ 3.6 Ghz 1.48 v bios Asus P5K eVGA 9800GTX 770/1944/2300 4 GB Patriot Extreme PC2-6400 
Hard DriveOptical DriveOSMonitor
150 GB WD Raptor 500 GB Barracuda 160 GB IDE HD LITE-ON DVD-RW Dual boot Vista / XP 32 Bit Samsung 226BW 22" WS 
KeyboardPowerCaseMouse
Emachines Antec Truepower Trio 650 W Antec Nine Hundred Microsoft Comfort Optical Mouse 3000 
Mouse Pad
Regular 
  hide details  
Reply
post #5 of 11
Yup, bump vcore. Make sure RAM is getting enough voltage, along with north bridge to try things as well. Also, if you run the small FFT succesfully, it leans towards the cpu being stable. If you then failed the blend test, it suggests RAM and/or northbridge are involved.
Optimus Prime 95
(13 items)
 
  
CPUMotherboardGraphicsRAM
q6600 (G0) @ 3.6; lapped EVGA 780i MSI 8800GT 512MB SLI 4x1GB Ballistix 8500 
Hard DriveOptical DriveOSMonitor
750Gb Samsung f1 Lite-On AIO Lightscribe Vista 64 Ultimate Sanyo PLV-Z4 
KeyboardPowerCaseMouse
Logitech Crapola Special 700W Rocketfish Antec 900 ULTIMATE, so you know it's serious... Logitech Crapola Special 
  hide details  
Reply
Optimus Prime 95
(13 items)
 
  
CPUMotherboardGraphicsRAM
q6600 (G0) @ 3.6; lapped EVGA 780i MSI 8800GT 512MB SLI 4x1GB Ballistix 8500 
Hard DriveOptical DriveOSMonitor
750Gb Samsung f1 Lite-On AIO Lightscribe Vista 64 Ultimate Sanyo PLV-Z4 
KeyboardPowerCaseMouse
Logitech Crapola Special 700W Rocketfish Antec 900 ULTIMATE, so you know it's serious... Logitech Crapola Special 
  hide details  
Reply
post #6 of 11
Quote:
Originally Posted by Abilor View Post
Yup, bump vcore. Make sure RAM is getting enough voltage, along with north bridge to try things as well. Also, if you run the small FFT succesfully, it leans towards the cpu being stable. If you then failed the blend test, it suggests RAM and/or northbridge are involved.
^What he said. While OC'ing I found out that 95% of the time it was my RAM settings causing the instability.
Over Budget
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 @ 3.6GHZ(450*8). EVGA 780i A1. EVGA 8800GTS (G92). 2x1GB OCZ PC26400 @ 900mhz/4-4-4-15-1T. 
Hard DriveOptical DriveOSKeyboard
WD Raptor X 150GB, Seagate 7200.11 1TB. Lite-On Lightscribe DVD Burner. XP Pro 32bit/Vista Ultimate 32bit (Dual Boot). Anyware PK-205 Slim. 
PowerCaseMouse
Antec Neo-Link 1.2KW (1 650W, 1 550W). Antec P190. Logitech G9. 
  hide details  
Reply
Over Budget
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 @ 3.6GHZ(450*8). EVGA 780i A1. EVGA 8800GTS (G92). 2x1GB OCZ PC26400 @ 900mhz/4-4-4-15-1T. 
Hard DriveOptical DriveOSKeyboard
WD Raptor X 150GB, Seagate 7200.11 1TB. Lite-On Lightscribe DVD Burner. XP Pro 32bit/Vista Ultimate 32bit (Dual Boot). Anyware PK-205 Slim. 
PowerCaseMouse
Antec Neo-Link 1.2KW (1 650W, 1 550W). Antec P190. Logitech G9. 
  hide details  
Reply
post #7 of 11
rounding error means you need more vcore
My Box
(15 items)
 
  
CPUMotherboardGraphicsRAM
I7 37700K ASrock Z77 Fatl1ty Pro Sapphire 7970 Vapor-X G.SKILL RIPJAW 16GB 
Hard DriveHard DriveOptical DriveCooling
Samsung 840 Pro 128GB SSD WD 250GB LB Blue ray rewriter Noctuna NH-D14 
OSMonitorPowerCase
Windows 8.1 QNIX 27" QX2710 2560x1440P Seasonic X-850w Corsair 500R 
  hide details  
Reply
My Box
(15 items)
 
  
CPUMotherboardGraphicsRAM
I7 37700K ASrock Z77 Fatl1ty Pro Sapphire 7970 Vapor-X G.SKILL RIPJAW 16GB 
Hard DriveHard DriveOptical DriveCooling
Samsung 840 Pro 128GB SSD WD 250GB LB Blue ray rewriter Noctuna NH-D14 
OSMonitorPowerCase
Windows 8.1 QNIX 27" QX2710 2560x1440P Seasonic X-850w Corsair 500R 
  hide details  
Reply
post #8 of 11
It also could be the ram voltage or the northbridge voltage. It usually helps to increase the NB to 1.4v or 1.55v when o/c'ing. Also try 2.1v ram voltage. You can always drop these back down if it turns out the cpu voltage that is too low. The maximum cpu voltage is 1.3625v on these, although you could set the bios at 1.4v and you may see 1.36v in reality (CPU-Z) with vDrop.
post #9 of 11
Thread Starter 
Thanks everyone for the feedback, there are some useful tips here.

Last night I experimented with different Vcore settings; I started at 1.3625v went into windows and loaded cpuz and noticed that the mobo undervolts a bit. So went back to BIOS and raised the voltage a couple of settings and repeated this process until I got to a point where cpuz was reporting 1.362v.

I notice that this board seems to overvolt the ram voltage a bit so I set my RAM voltage at 2.1v and went through the same process until Everest was reporting DIMM volts at 2.1v.

My NB and SB voltages are set in BIOS at auto, Everest reports that these are 1.63v and 1.07v.

I haven't run Prime95 for a great length of time yet as I went out last night and I don't like the idea of leaving the PC running without monitoring it. However, I did manage Prime95 for 1 hour without any errors.

The cpu core temps seem a bit odd though, Everest reports that cores 1 and 2 are always runing at least 10 degs C lower than cores 3 and 4.

Thanks again everyone for the good feedback, I'm gonna try running Prime95 for 8 hours and I'll report back in a couple of weeks as I'm off on holiday to do a spot of scuba diving.
Blue Dragon
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Core i7-2700K Sandybridge Socket LGA1155 Asus P8Z68 DELUXE Intel Z68 (Socket 1155) DDR3 EVGA GeForce GTX 580 Superclocked with Backplate EVGA GeForce GTX 580 Superclocked with Backplate 
RAMHard DriveOptical DriveCooling
Vengeance DDR3 1866 Mhz Crucial RealSSD M4 Plextor PX-LB950SA Koolance CPU-370 
CoolingOSMonitorKeyboard
Koolance VID-NX580 Windows 7 64bit Dell Ultrasharp 24" Logitech G15 Gaming Keyboard 
PowerCaseMouse
Corsair AX1200 Corsair Obsidian 800D Logitech G5 Gaming Mouse 
  hide details  
Reply
Blue Dragon
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Core i7-2700K Sandybridge Socket LGA1155 Asus P8Z68 DELUXE Intel Z68 (Socket 1155) DDR3 EVGA GeForce GTX 580 Superclocked with Backplate EVGA GeForce GTX 580 Superclocked with Backplate 
RAMHard DriveOptical DriveCooling
Vengeance DDR3 1866 Mhz Crucial RealSSD M4 Plextor PX-LB950SA Koolance CPU-370 
CoolingOSMonitorKeyboard
Koolance VID-NX580 Windows 7 64bit Dell Ultrasharp 24" Logitech G15 Gaming Keyboard 
PowerCaseMouse
Corsair AX1200 Corsair Obsidian 800D Logitech G5 Gaming Mouse 
  hide details  
Reply
post #10 of 11
Thread Starter 
I managed to get a bit of Prime95 testing in last night while packing up to go on my scuba trip and managed just over 4 hours without any errors so things are looking better.

+reps for the advice.

Sniffs .............
Blue Dragon
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Core i7-2700K Sandybridge Socket LGA1155 Asus P8Z68 DELUXE Intel Z68 (Socket 1155) DDR3 EVGA GeForce GTX 580 Superclocked with Backplate EVGA GeForce GTX 580 Superclocked with Backplate 
RAMHard DriveOptical DriveCooling
Vengeance DDR3 1866 Mhz Crucial RealSSD M4 Plextor PX-LB950SA Koolance CPU-370 
CoolingOSMonitorKeyboard
Koolance VID-NX580 Windows 7 64bit Dell Ultrasharp 24" Logitech G15 Gaming Keyboard 
PowerCaseMouse
Corsair AX1200 Corsair Obsidian 800D Logitech G5 Gaming Mouse 
  hide details  
Reply
Blue Dragon
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Core i7-2700K Sandybridge Socket LGA1155 Asus P8Z68 DELUXE Intel Z68 (Socket 1155) DDR3 EVGA GeForce GTX 580 Superclocked with Backplate EVGA GeForce GTX 580 Superclocked with Backplate 
RAMHard DriveOptical DriveCooling
Vengeance DDR3 1866 Mhz Crucial RealSSD M4 Plextor PX-LB950SA Koolance CPU-370 
CoolingOSMonitorKeyboard
Koolance VID-NX580 Windows 7 64bit Dell Ultrasharp 24" Logitech G15 Gaming Keyboard 
PowerCaseMouse
Corsair AX1200 Corsair Obsidian 800D Logitech G5 Gaming Mouse 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Intel CPUs
Overclock.net › Forums › Intel › Intel CPUs › Prime95 FATAL ERROR Rounding Question