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Maximum Voltage recommended for a 65nm CPU

post #1 of 4
Thread Starter 
I have the Q6600 B3 stepping and I'm currently working on overclocking
from 1.4V at 3.1GHZ, I'm at 1.5V at 3.3GHZ

my goal is to reach 3.6GHZ stable with voltages under 1.6V

my rig is in my signature, and I have the corsair H50
which kept my Q6600 @ 3.1GHZ 1.4V Idle=22C and Load=36C
which is now Q6600 @ 3.375GHZ 1.5V Idle=32C and Load 51C

So back to my original question, what would be the maximum recommended voltage? for a stable overclock?
post #2 of 4
For Intel's 65nm Core2s like the Q6600, the maximum safe voltage is supposed to be about 1.55V (the voltage you'd see in CPU-Z).

But the maximum recommended voltage for a safe overclock is a voltage that makes the overclock rock-solid stable (as proven by thorough stress testing).

So, always go by the voltage in CPU-Z, not what's selected in the BIOS.
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It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #3 of 4
Thread Starter 
I see you favor CPU-Z over the BIOS

thats kinda weird, because the BIOS sets the voltage

How long should my overclock be under Prime95 before its considered stable?
post #4 of 4
Quote:
Originally Posted by TerminatorXT View Post
I see you favor CPU-Z over the BIOS

thats kinda weird, because the BIOS sets the voltage

How long should my overclock be under Prime95 before its considered stable?
It's not that I favor it, but it's that it's showing the actual voltage that is running through the CPU. There are 2 things you will notice, both of which are very normal and are an intentional design:
  • vDrop: this results in the voltage that you'll see when the system is idling.
  • vDroop: this results in the voltage you'll see when the CPU is under full load.
Regarding stability, this will come as a shock. But don't worry because it's actually quite easy. I'll start with Prime testing. If you have the 64-bit version of Windows 7, then use the 64-bit version of Prime95. If you have the 32-bit version of Windows 7, then use the 32-bit version of Prime95. To close Prime95 all the way when you're finished, right-click on its icon in the System Tray/Notification Area and choose "Exit".
  1. 12 hours of the Small FFTs test.
  2. 12 hours of the Blend test.
  3. 12 hours of the In place large FFTs
Then there's linpack testing. For that, I highly recommend LinX. Here's how I recommend using it (it's very similar to what its Read Me says):
  1. Begin from fresh boot.
  2. Click the button that says "All" next to where it shows the amount of memory to use.
    • If you have the 64-bit version of Windows 7, then make a mental note of how much memory it chose, and then un-click the button and reduce it by 10 MB at a time (or more) until the test starts. I was able to use 3400 MB. See how much you can get it to use!
    • If you have the 32-bit version, then you don't need to worry about it.
  3. Set it for 100 runs.
  4. Start the test.
  5. Be aware that this test will get the CPU about 10-15°C wamer than Prime testing. It will also heat up the memory a little more too.
Then there's Memtest. This doesn't stress the memory, but instead, it can reveal errors. The best way to use Memtest is to just run it and let it do about 10 passes. 1 pass is when it completes all 8 of its default tests.

There are other little things you can do, but damn: if it can do all of this, then you know it's stable.

If you want to make all of this easy, then do each test while you're sleeping. Besides, it's best to avoid doing anything with the computer while each test is running.
Edited by TwoCables - 12/10/09 at 9:58pm
It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (OS) 3 TB Toshiba P300 (storage) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
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