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E6420 OC questions

post #1 of 9
Thread Starter 
Hi I'm new here. Lol. Also first time doing a moderate bit of overclocking.

Got a E6420, Asus P5B Deluxe, Zalman 9700 and OCZ PC-6400 2GB Plat Rev2.

At the moment I am at 2.67Ghz (333x8) and it is stable (using Prime95 and Orthos). Temperatures seem fine (52 Max on TAT).

I'd just like to ask a few questions:

1. Currently the vCore is set to 1.3625V in the Bios, but CPU-Z, Asus PC Probe and the BIOS think it is 1.32V and Core Temp thinks it is 1.35V. So what is it and how much should I use?

2. When I tried 2.8Ghz (350x8) it seemed perfectly stable (via P95 and Orthos), but for some odd reason a game crashed it in 15-20 minutes. Perhaps do I need to increase voltage to NB or PCI-E? I am pretty sure I have locked PCI-E at 100Mhz.

3. How should I get beyond 350 FSB. At 366 it seemed not to boot. Is there a strap limit there? Or do I need to increase Vcore and VNorthBridge?

4. Finally what temperatures should I believe (i.e. what program - BIOS, Systool, Speedfan, Core temp or ASUS) and what should be the upper limit (I am thinking about 65 for Tjunction in TAT and maybe 55 for Tcase?!)

Thanks very much.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core 2 - E6420 (@3.00 375x8) Asus P5B Deluxe Wifi-AP X1950XT 2GB OCZ DDR2-800 Plat Rev2 
Hard DriveOSMonitorPower
2x 320GB Vista 32-bit Dell 20" LCD Tagan 480W 
Case
Antec P120 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core 2 - E6420 (@3.00 375x8) Asus P5B Deluxe Wifi-AP X1950XT 2GB OCZ DDR2-800 Plat Rev2 
Hard DriveOSMonitorPower
2x 320GB Vista 32-bit Dell 20" LCD Tagan 480W 
Case
Antec P120 
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post #2 of 9
I have an e6420 and up until 2.9ghz I think I didn't have to change voltages for anything, but then again it might vary with the motherboard. The 1.35v in your COretemp shows the default of your CPU I think. Also, how long do you let orthos run for? Usually to make sure it's rock solid people leave it for about 6 hours.
post #3 of 9
Ryzen 7 1700
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Samsung 950 Pro 512GB PCIe/NVME SSD Xigmatek Scylla 240 AIO Win10 Pro X64 Qnix QX2710LED @ 110hz 
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Ryzen 7 1700
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Samsung 950 Pro 512GB PCIe/NVME SSD Xigmatek Scylla 240 AIO Win10 Pro X64 Qnix QX2710LED @ 110hz 
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Cooler Master Masterset MS121  EVGA G2 850 w/EVGA Black Cableset Lian Li Test Bench Cooler Master Masterset MS121  
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post #4 of 9
Thread Starter 
I seem unable to get beyond 370. I tried to avoid the 360-400 hole, by going to 402 and 8x, but it wouldn't boot. I then tried 1.4V (probably actually 1.36Vcore) and 1.45V for NB, but still didn't work.

Any ideas?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core 2 - E6420 (@3.00 375x8) Asus P5B Deluxe Wifi-AP X1950XT 2GB OCZ DDR2-800 Plat Rev2 
Hard DriveOSMonitorPower
2x 320GB Vista 32-bit Dell 20" LCD Tagan 480W 
Case
Antec P120 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core 2 - E6420 (@3.00 375x8) Asus P5B Deluxe Wifi-AP X1950XT 2GB OCZ DDR2-800 Plat Rev2 
Hard DriveOSMonitorPower
2x 320GB Vista 32-bit Dell 20" LCD Tagan 480W 
Case
Antec P120 
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post #5 of 9
Might be your ram limiting you. Check the timings on it.
post #6 of 9
i needed 1.45v to go over FSB 400. running 420 at those volts now. (seeing your temps, you could try 1.45 as well)
measured voltage is 1.42 idle, and 1.38 load. dont mind it too much. whats important is your temps, as long as they're below 60C you can continue.
post #7 of 9
Hello Mileswu and welcome to the Forum!

I've got exactly the same set up as you and am running at 3.2Ghz with 1.32v.

A few things which destabilized my system at the beginning were the Mainboard voltage settings.
Check that uve got your memory on the specified voltage (for my corsair its 2.1v).
Set FSB terminantion to 1.2 (lowest)
Set NB Vcore to 1.45
SB vcore 1.5
ICH to 1.2125 (i think its that, the larger of the two options)

Then, as someone already mentioned set your RAM timings ultra-loose so that they wont mess things up. Up the FSB ( I had no problems with POST at 400 when I had the Mainboard voltages like stated above, lower NB vcore and it wouldnt Post)
Also, when increasing FSB check your RAM divider. Just make sure ur RAM are at or below 400MHz (their spec) and POST shouldnt be a problem.

Also, dont use TAT to test your stability, Intel themselves have said its not optimally safe when overclocking. Use Prime95 or Orthos.
Happy Sunshine
(13 items)
 
  
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E6420 @ 3.5 Ghz (500x7) 1.42v Asus P5B-Deluxe Gainward 8800 GTS @ 650/2010 Crucial Ballistix DDR2-6400-C4@ 1000MHz CL-5 
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Happy Sunshine
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6420 @ 3.5 Ghz (500x7) 1.42v Asus P5B-Deluxe Gainward 8800 GTS @ 650/2010 Crucial Ballistix DDR2-6400-C4@ 1000MHz CL-5 
OSMonitorPowerCase
WinXP 32bit NEC 1970GX Targan 580W PSU Thermaltake Xaser3 
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post #8 of 9
Thread Starter 
Thanks all.

It POSTed at 400+ now, it was the auto-detection of my RAM timings. However, it was not stable at 400x8, it crashed windows while I was running TAT for temperature checking. Should I increase Vcore?

Ebsel1: You said you were running at 1.32V. Is that what you have set or is that what you are seeing the BIOS monitor or CPU-Z? Because I have set 1.375V and the BIOS reports 1.33 and CPU-Z 1.336 (but 1.312V on load). Is that this Vdroop, and which voltages should I believe?

It seems to be running fine now at 375x8, but I have not Games, which is where it crashed last time at 360x8. Now running Orthos for a couple of hours to see.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core 2 - E6420 (@3.00 375x8) Asus P5B Deluxe Wifi-AP X1950XT 2GB OCZ DDR2-800 Plat Rev2 
Hard DriveOSMonitorPower
2x 320GB Vista 32-bit Dell 20" LCD Tagan 480W 
Case
Antec P120 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core 2 - E6420 (@3.00 375x8) Asus P5B Deluxe Wifi-AP X1950XT 2GB OCZ DDR2-800 Plat Rev2 
Hard DriveOSMonitorPower
2x 320GB Vista 32-bit Dell 20" LCD Tagan 480W 
Case
Antec P120 
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Reply
post #9 of 9
I run 1.32v in the bios. CpuZ often does not exactly show the vcore, and if it drops under load then it is indeed the vdroop. No need to worry about that. Take the settings in the BIOS as the ones to trust. U can up the voltage there til 1.4, max 1.45.

Except for that just make sure its not ur RAM which is causing the destabilisation, and work your way up with cpu voltage to run it stable. If it wont run stable then uve reached the max of your chip with your cooling. I seem to have gotten a great chip, some are better, some are worse.
Happy Sunshine
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6420 @ 3.5 Ghz (500x7) 1.42v Asus P5B-Deluxe Gainward 8800 GTS @ 650/2010 Crucial Ballistix DDR2-6400-C4@ 1000MHz CL-5 
OSMonitorPowerCase
WinXP 32bit NEC 1970GX Targan 580W PSU Thermaltake Xaser3 
  hide details  
Reply
Happy Sunshine
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6420 @ 3.5 Ghz (500x7) 1.42v Asus P5B-Deluxe Gainward 8800 GTS @ 650/2010 Crucial Ballistix DDR2-6400-C4@ 1000MHz CL-5 
OSMonitorPowerCase
WinXP 32bit NEC 1970GX Targan 580W PSU Thermaltake Xaser3 
  hide details  
Reply
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