QX6700 @ 3.4 ghz Need to go higher, any advice ?

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BenNg

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Sep 16, 2006
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I got my Qx6700 to 3.4 fully stable with the following setting
Cpu freq: 340
Vcore: 1.378
Multiplier: 10 (I can't go any higher, qx6700 limit 10 ????)
Dram timing by SPD
Dram freq: 680
Dram voltage 2.0V
I am using swiftech H220 water cooling, currently iddle at 40C and full load all 4 cores 100% at 58C
My spec: P5W DH, 4g of DDR2 800, 480W Antec PSU, and a low end graphic card (I don't need much graphic)
I tried 3.6 with vcore 1.4375 but it crash after 10 mins full load and Core Temp reached 64C
Some one have experience with Qx6700, please give me some advice. My goal is 4.0 ghz
 
I got my Qx6700 to 3.4 fully stable with the following setting
Cpu freq: 340
Vcore: 1.378
Multiplier: 10 (I can't go any higher, qx6700 limit 10 ????)
Dram timing by SPD
Dram freq: 680
Dram voltage 2.0V
I am using swiftech H220 water cooling, currently iddle at 40C and full load all 4 cores 100% at 58C
My spec: P5W DH, 4g of DDR2 800, 480W Antec PSU, and a low end graphic card (I don't need much graphic)
I tried 3.6 with vcore 1.4375 but it crash after 10 mins full load and Core Temp reached 64C
Some one have experience with Qx6700, please give me some advice. My goal is 4.0 ghz
Click to expand...

You will not get a Qx6700 to 4 GHz on water. It runs insanely hot OC'd. The phase people are having to retune their units to deal with running this processor full out. You are getting 58C @ 1.378 using water. Think about that. You will need closing in on 1.6 vcore to hit 4 GHZ in all probability if your cpu clocks like many people are seeing. Now extrapolate from 58/1.378 to X/1.6 (and it's not a linear rise and its not in your favor). Further, you could be getting instability from doing this with 4 gig of RAM. Next, what Antec PSU? You want solidly stable heavy duty quality power for high overclocks on Qx6700 and 4 gig of RAM. 480W is low for this CPU, IMO. Plus it's Antec, which isn't top tier in any event.
 
I use it for heavy computation, not for gaming. I do think that my PSU is weak, however, do you think the psu is a real factor at this point, all power flow is stable and sufficient when i check them. But the temp and voltage is the problem I have. I do not know any other cooling beside water cooling. Is there a good cooling trick that I don't know about ?
 
I use it for heavy computation, not for gaming. I do think that my PSU is weak, however, do you think the psu is a real factor at this point, all power flow is stable and sufficient when i check them. But the temp and voltage is the problem I have. I do not know any other cooling beside water cooling. Is there a good cooling trick that I don't know about ?
Click to expand...

Unless you want to go TEC, phase change or chillers you are ultimately limited in your overclock. I'm not saying you should move to these advanced/riskier cooling techniques. You have to do your own risk vs. reward vs. cost analysis.

As to your PSU, QX6700 is an $1100+ processor. The quality of your PSU should be on par, especially if you are going to OC it substantially. Where does your PSU fall on this list?
http://www.xtremesystems.org/forums/showthread.php?t=108088

See the last few pages of this thread regarding some of the difficulty people are seeing even with phase cooling for OC'd QX6700:
http://www.xtremesystems.org/forums/showthread.php?t=92509&page=13

Also, what kind of computation? Where does the stress lie? RAM bound? Paging to hard drive a lot?
 
Swiftech will provide enough cooling to reach 4Ghz, dont worry about that.

Raise vMCH to the max. the NB will run very hot after this of course, thats why I strongly advice you to slap a small fan on it (or even water cool it).
Run the advertised voltage on the RAM but use 5-5-5-15 2T timings.
Vcore shouldnt go over 1.45v to keep temps acceptable.
Give vFSB some help with the voltage and raise vICH (SB) by just a notch.

Remember that you have a Tjunction of 100c, so youve got more headroom when it comes to temperatures than a C2D.
 
10X multiplier is the max for the Qx6700.

To date, the only member of the C2 family that you can up the multiplier on is the x6800.

Everything I have heard tells me that you can not push your cpu verry far.
Proper cooling and power supply to 4 cores in that small of a package make it next to impossible to reach the same levels of OC'ing as it's dual core brethren.

You have already gotten substansial increases out of your investment.
It is running at ~127.5% of stock already which is verry respectiable.

With the Qx6700 costing bout $1600 us, I would recomend erroring on the side of caution and leaving it were it is.
 
Swiftech will provide enough cooling to reach 4Ghz, dont worry about that.

Raise vMCH to the max. the NB will run very hot after this of course, thats why I strongly advice you to slap a small fan on it (or even water cool it).
Run the advertised voltage on the RAM but use 5-5-5-15 2T timings.
Vcore shouldnt go over 1.45v to keep temps acceptable.
Give vFSB some help with the voltage and raise vICH (SB) by just a notch.

Remember that you have a Tjunction of 100c, so youve got more headroom when it comes to temperatures than a C2D.
Click to expand...

He has vcore of 1.378 @ 3.4GHz. Going to 1.45v will not get him to 4 GHz on this processor. Water cooling, unless you have a golden processor, will not run this quad core at 4 GHz in any event. It's just too hot. Espcially since it seems he wants it there for daily use.
 
With the Qx6700 costing bout $1600 us, I would recomend erroring on the side of caution and leaving it were it is.
Click to expand...

You are correct that it is best to be cautious, but your price sounds like the newegg one (which is insane). That proc can be had for $1200 retail here:
http://www.tankguys.biz/intel-quad-core-qx6700-kentsfield-retail-p-1701.html

And I've seen it for just over $1k occassionally elsewhere. Very careful shopping is needed on this proc.
 
I also somewhat doubt he can hit 4ghz if he is already at 58C under load with the water kit at only 3.4ghz. Xtremesystems had a thread when coolaler first got a QX6700 and under a cascade he could only hit 4.0ghz on one of the chips he tested. Remember that with 4 cores it will be limited by it's weakest core and your odds of getting a "golden" cpu decline greatly when sticking more cores on the die.
 
I also somewhat doubt he can hit 4ghz if he is already at 58C under load with the water kit at only 3.4ghz. Xtremesystems had a thread when coolaler first got a QX6700 and under a cascade he could only hit 4.0ghz on one of the chips he tested. Remember that with 4 cores it will be limited by it's weakest core and your odds of getting a "golden" cpu decline greatly when sticking more cores on the die.
Click to expand...
Yup.
 
Temperatures dont concern me, since its clear that this wont be a 24/7 OC.
And Coolaler tested an ES, the ES for C2Q were poorly produced in comparison to the few retail samples in the market. In any case I think the MB will be the limited factor, the P5W is knowned for having a very weak NBCC.
 
Temperatures dont concern me, since its clear that this wont be a 24/7 OC.
And Coolaler tested an ES, the ES for C2Q were poorly produced in comparison to the few retail samples in the market. In any case I think the MB will be the limited factor, the P5W is knowned for having a very weak NBCC.
Click to expand...

He said he wants it for heavy computation. That implies extended periods of heavy load to me.
Temperatures may not concern you, but I suspect they concern the guy with the $1200 cpu you are advising.
If he's 58C at only 3.4 GHz on water what do you think he will be pulling at 4 GHz? There is usually a huge vcore differential between these performance levels.
 
The 4Ghz wont be 24/7 thats for sure, but any speed he achieves stabily at my recommended settings could be.

Temperatures may not concern you, but I suspect they concern the guy with the $1200 cpu you are advising.
Click to expand...
Remember that you have a Tjunction of 100c, so youve got more headroom when it comes to temperatures than a C2D.
Click to expand...
:lol:
 
First let’s see where your thermal limits are.
Set the Vcore to 1.55 absolute max allowed by Intel.
Run up the FSB to 366X10 make sure hyper path 3 is disabled in the chipset section of the bios menu.
Run prime 95 on all four cores and see if your temps reach no higher than 61.4C lets call it 62C.
If your stable and temps are in limits you can bring up the FSB by small increments until you achieve your max Oc on water.
If you have this pump http://www.swiftnets.com/products/mcp655.asp
Make sure the potentiometer on the back of the mcp655 pump is maxed out if you have the latest revised pump. (Fully clockwise)
Watch the flow thru the reservoir to ensure your flow is actually increasing.
This board is a little weak on the high end of the FSB so leave the multiplier at 10
Some of these boards have a hard time at around 300fsb so up the Northbridge volts to 1.45 or 1.55 and go straight to 366 the same happens around 380 to 400.
You may have to do a series of resets to stabilize the board so write down the settings because the board freeks out when you push it until you hit the sweet spot.
if your able to keep your temps low and are not afraid of Vcore you can push it further but if you hit your thermal limits at 366 @ 1.55 of cant post you have to approach this from a different angle
 
The 4Ghz wont be 24/7 thats for sure, but any speed he achieves stabily at my recommended settings could be.
Click to expand...
Again, he said he wants it for heavy computation. That implies extended periods of heavy load to me. You think otherwise why? Do you interpret his statement:
I use it for heavy computation, not for gaming.
Click to expand...
as Spi 1M only or something?

I don't see people running their primary computational activities (i.e. whatever daily WORK they are doing) at 4 GHz with water on the Quads. If you do, please link to those people and what it is they are using and doing.
 
Run prime 95 on all four cores and see if your temps reach no higher than 61.4C lets call it 62C.
Click to expand...
Gaah, no. That measurement was taken on the surface of the IHS on C2Ds, the temperatures reflected by TAT and CoreTemp are equations from the thermal probe within the CPU, therefore they WILL be higher.
100c (Tjunction) is the actual temperature to avoid at all times.
This article will cerainly help.
 
Tjunction is meltdown my friend.
the only temp you can monitor is with core temp and the asus software pc Probe II along with a few other generics.
the Temps to monitor are as stated.
the cpu will handle anything over 80C
where in theory it will shut down at its set point.
you can not monitor Tjunction
read the data sheets to understand my reply .
this is where Intel sets its thermal limits and I dont think he has a thermal probe a mica cutter and the fluke to measure the actual temp at the heat spreader between the waterblock and cpu
 
Tjunction is not meant to be monitored, its as you said "the meltdown" for every CPU, its a value setted by Intel (even that if youre knowable in C++ you can change it). But C2s throttle at such temp to prevent damage.
It seems to me that we are on the same idea, did you read the article?
 
Doesn't he have a QX6700, is that not an Extreme processor which would include an unlocked multiplier..., just wondering cause i thought all Extreme editions were unlocked? not that would help much,

and one last thing, why do you need to increase the speed of your processor since it is pretty much one of the most powerful single socket setups around.., i mean thats like saying my Bugatti Veyron isn't fast enough i need 300 more hp, you've already beaten everyone else and then some, how much more power do you need!? 😛 😛 😛 Take it easy Captain Kirk, "scotty, i need more power" lol
 
yes I read the article and I want no part of your argument . :wink:
You cant change a binned chip or we would all own X6800's
but if you figure it out let me know because I sure need to unlock upwards 8)
 
Tjunction is not meant to be monitored, its as you said "the meltdown" for every CPU, its a value setted by Intel (even that if youre knowable in C++ you can change it).
Click to expand...
You can change it? What are you talking about? If you are talking reprogramming core temp...who would care? If you are talking changing the property of the chip itself... :roll:
I know my C++. Explain to me in your own words how to change it.
 
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