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Q6600: Unable to overclock

post #1 of 12
Thread Starter 
I had a Core 2 Duo E6600 running at 3.2 GHz for awhile, and upgraded to a Q6600 a couple of months ago, stock clocked (same eVGA 680i motherboard). This week, I decided to try overclocking the Q6600, and so far my efforts have been complete failures. After reading the 680i/780i guides on the eVGA website and the various posts here, I see that running the QDR FSB at 1333 should be a walk in the park.

I set the FSB:RAM ratio to linked/synced, and set the FSB to 1333. Result: Vista instantly reboots just before showing login screen.

So I increase the voltages to those found in the 780i overclocking guide (should be the same for 680i): 1.4v CPU, 1.3v FSB, 1.4v SPP/NB, 1.525v MCP/SB, and 1.25v MCP<->SPP. Result: Same instant reboot. I have verified the CPU voltage using CPU-Z when I boot with stock clocking.

So I figure something is off with the memory. I then tried all of the following (individually and in groups):
* Increased RAM voltage to 2.0v (RAM is rated for 1.8v-2.0v).
* Unlinked RAM and set all speed/timings to what they were originally in stock mode.
* Tried with just 1 stick of RAM.
* Tried with just 1 stick of another set of RAM I have.

The result is always the same: Vista reboots right before showing login screen.

XP does the same thing, except I can see it at least try to show a BSoD for a fraction of a second before it reboots. I haven't tried booting Linux yet, but I can't imagine it'd be much different.

I had a Core 2 Duo overclocked to 3.2 GHz on this motherboard just fine. And the RAM I used for that build exhibits the same problem when I try to use it instead of the new RAM on this build. This makes me believe it's not a RAM issue, but I'm not exactly experienced with overclocking so who knows.

Any ideas of what to try next? It seems like 3.2 GHz should be an easily obtainable goal, but so far I can't boot with anything over 2.7 GHz.
post #2 of 12
What version is your 680i?

If it is a earlier AR version you will not be able to OC with a quad. The A1 version fixes those issues.

Check the stickers on the motherboard or the box to find out.
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The Leviathan
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post #3 of 12
yeah that would be my guess its probably a nf68-AR which is a no go with quads
    
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nope! 
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CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
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nope! 
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post #4 of 12
Thread Starter 
The eVGA part number is 122-CK-NF68-TR. So I'm guessing it's not an AR board?
post #5 of 12
I would try to lower the NB to 1.30, 1.5 is a little high. I have the ASUS 680i and run my Q6600 @ 1.27 vcore/1333FSB, 1.25 NB, 1.30 SB and 1.25v MCP<->SPP. You could just be overheating the NB. Although you may just have a weird board.
post #6 of 12
Thread Starter 
Thanks for the suggestions so far!

Using your voltage settings seemed to get me a little further. The only difference is I had to use 1.5v for the MCP/SB, the BIOS settings wouldn't let me go any lower. Instead of resetting, I was able to get an actual BSoD before the login screen. Interestingly, right before the BSoD the video card seemed to switch to the Windows default 800x600 VGA mode. I saw a rather huge mouse cursor for a second before the BSoD. It's like Windows couldn't detect the video card and used the default VGA driver, or the NVidia drivers failed to initialize. The video card is an NVidia 8800 GTX.

If I go back to unlinked 1066 FSB/800 RAM, then it boots just fine with your voltages and the 680i/780i guide voltages.

BSoD Details:
stop: c000021a {Fatal System Error}
Windows SubSystem system process terminated unexpectedly with an error code 0xc000001d
[paraphrased, hex values are real]
post #7 of 12
TR and AR boards are identical so its the mobo that's holding you back most you can hope for is 2.8 or so
    
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nope! 
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CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
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nope! 
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post #8 of 12
Thread Starter 
Aw great, that figures. Is it a hardware problem, or a BIOS problem? i.e. can the board be flashed with a newer BIOS to fix this?
post #9 of 12
its a hardware issue with how the power is delivered. you should be able to exchange your board give evga a call
    
CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
Mouse Pad
nope! 
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CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
Mouse Pad
nope! 
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post #10 of 12
Thread Starter 
I'll have to try that, but the board is 9 months old now so who knows. Thanks for the information!

If I decide to just get a 750i/780i board, is there anything to look out for with quad-core compatibility/overclockability?
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