need help overclocking my QX6850

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Kaitlin Kaschak459

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ok so i have a QX6850 that is liquid cooled via an AIO. temps idle between 37-40c. at max load in prime95 in blend test at stock speeds 3.0GHz temps max out around 56-57c. while not new to overclocking my previous chip was a core 2 duo E8500 im new to overclocking quads so i have a few questions

#1 what temps should i watch out for while stress testing in prime i.e. keep CPU under X temp/temps when stressing for stable speeds

my goal is to reach 4.0GHz stable 24/7

#2 aside from reading the overclocking guide on here is there anything else i should know ABOUT MY QX6850 IN TERMS OF OVERCLOCKING I KNOW THESE THINGS ARE KNOWN TO BE HEATERS

lastly should i test under small FFT's or blend wanna make sure both cpu and ram are stable

also what options do i disable in the bios so while stress testing the cpu will run full speed all the time and not lower its multi and stuff

BEFORE I FORGET im using MX-4 as my thermal paste below is a link to my AIO just incase

http://www.coolermaster.com/cooling/...quid-lite-240/

AIO is run in push pull setup because i had the extra fans lying around
 
Solution
Lutfij
Keep your NB voltage and temps under control, upping the voltage does help with the system's stability but it also adds more heat as you progress with stressing. Conversely you can up the CPU voltage to counter lowered NB voltages but that would also mean you have heat to deal with from your CPU instead.

Your mileage will vary with the board you have at hand. I worked with the Asus Rampage Extreme(x48) to learn some things first hand. So long as you're not reaching Tj Max of the processor, you're good. Your link doesn't work for me so I can't say what sort of cooling you have at hand.

You can go through my AMS build log(in my sig to understand how I worked through the overclock).

I'll leave this here for further reading.
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Lutfij

Lutfij

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Keep your NB voltage and temps under control, upping the voltage does help with the system's stability but it also adds more heat as you progress with stressing. Conversely you can up the CPU voltage to counter lowered NB voltages but that would also mean you have heat to deal with from your CPU instead.

Your mileage will vary with the board you have at hand. I worked with the Asus Rampage Extreme(x48) to learn some things first hand. So long as you're not reaching Tj Max of the processor, you're good. Your link doesn't work for me so I can't say what sort of cooling you have at hand.

You can go through my AMS build log(in my sig to understand how I worked through the overclock).

I'll leave this here for further reading.
 
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Kaitlin Kaschak459

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this is the board im working with https://www.gigabyte.com/Motherboard/GA-EP45C-UD3R-rev-10#sp
 
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william p

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I got my QX6800 to run 4GHz on a locked BIOS Dell (CPUZ in my sig.) with a Dell heatpipe cooler. No stability there. But with the unlocked CPU it was very simple. Those 65nm CPUs can handle some Voltage. Since your board already has good VRM and chipset cooling, I would suggest raising the Voltage to 1.5875V. and set the multiplier to 12x333. You can actually do this in Windows, and if it crashes it will just reboot to normal speed/Voltage. Then start backing down/up the Voltage.
If you use Throttlestop 6.00 software you can control Voltage, and multiplier "on the run" in Windows. Find your settings, and then lock the OC down in the BIOS if you want to. You could raise FSB to 1600 in BIOS and start at 3.6GHz and run 10x400 also.
Here's a thread on this method.
https://www.techpowerup.com/forums/threads/throttlestop-overclocking-desktop-pcs.235975/
if your cooling is good you could be at 4GHz in about 10 minutes.
 
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Kaitlin Kaschak459

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4ghz was a no go even my 240mm AIO water cooling rad couldnt handle the temps it go up to the 80's at clost to 3.6ghz even with MX-4 thermal paste
 
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Kaitlin Kaschak459

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below is a link to my cpu cooler

http://www.coolermaster.com/cooling/cpu-liquid-cooler/masterliquid-lite-240/
 
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william p

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As I said no stability there (4GHz). I unplugged the PWM wire form my 2 motor fan, got a validation and shut it down. I was gaming at 3.72Ghz. Unfortunately the QX6850 has full multiplier steps like the other 65nm extremes. You might need to use SetFSB to turn down the FSB so you can add another multiplier, and then tune back up with SetFSB to 3.7-3.8GHz.
For example 13X300=3900 MHz/3.9GHz
I list 3.72GHz in my sig. but the validation link is for 4Ghz.
Temps in prime will be higher than normal use. I run 3x Prime 95 which simulates useful gaming loads since 100% CPU = bottleneck. 75% is useful load to represent gaming.
To get 4GHz on that CPU Dell used an H2C Peltier asisited water loop in their XPS 720/730 computers.
 
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william p

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I had something I had to go do. But you can read the link in my sig. to Overclocking Dell BTX Computers to get some ideas.
You don't say what MB you have.
CPUZ for QX6850
http://valid.x86.fr/top-cpu/496e74656c28522920436f726528544d29322045787472656d652043505520513638353020204020332e303047487a
CPUZ for QX6800 showing multiplier overclocks 15x266 fsb. Mine is #5, it was #2 at the time I posted it.
http://valid.x86.fr/top-cpu/496e74656c28522920436f726528544d29322045787472656d652043505520513638303020204020322e393347487a
You need to start right at he CPU heat spreader. Lapping it flat with progressively finer grades of sand paper on a piece of glass to get a better metal to metal contact with the heatsink which should already be polished if it's a good one. Research which TIM compound is the good one right now. Use as little as possible. You want the thinnest layer with no trapped air. This means a small dot in the center that pushes air out as it spreads.
VRM cooling if it isn't already there. Air flow In , through the cooler, and out the case, over the VRMs also. Be aware that air doesn't blow straight out the back of fans it spreads in a cone with a big dead spot in the middle, unless something constrains it. There are a lot of small things that add up a little bit at a time to get to 4GHz with one of these CPUs. Water cooling can't go below room temperature. The more RT air going through the radiator the closer it will get. But the heat has to be able to leave the CPU in the first place, and the MB needs to provide the Watts to run these old beasts.
You might ry LGA775 Club at OCN. They (We) love these things there.
http://www.overclock.net/forum/8-intel-general/952622-lga775-club.html
 
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Kaitlin Kaschak459

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this is the link to my mobo

https://www.gigabyte.com/Motherboard/GA-EP45C-UD3R-rev-10#ov

as for tim im using arctic cooling MX-4 alongside a 240mm aio
 
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william p

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4GHz stable probably isn't a realistic goal for that CPU. The QX9650 willl do that and a little more, and on an unlocked MB the Q9650 also. The problem with the unlocked 65nm CPUs is the faster the fsb the bigger the full multiplier steps become.The 45nm Etremes have 1/2 multiplier steps. Since that board supports 1600fsb you can set the CPU at 11x333=3.67 Ghz and start bumping the fsb up until you can't maintain temperature under load. The more Voltage the more speed, but also more heat. You just need to find what your cooling and CPU will tolerate. The cooler you have has a big enough radiator but the ribbed hoses, and rough water block will limit what it can do compared to a custom water loop. It will probably equal a high end air cooler. Water loops and air cooler both dump the heat into the surrounding air. They can't go cooler than that, only approach it more or less. 3.8GHz bench stable will probably be where you end up. maybe a little more. Kake sure you have a fan moving air aound the CPU/VRM area of the MB. It's easy to lose sight of that with a water loop.
 
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