vCore too high??

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prplvelvet

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Nov 19, 2006
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I am running my E6600 at 3.6GHz, but can't get it stable in prime95 unless I really crank the vcore up.

Idle - 32C - 1.525V
dual prime95 load - 52C - 1.46V

Any suggestions on how to bring that voltage down?

Running with Asus P5B deluxe and swiftech water cooling on the cpu.
I am kinda disappointed with the OC results I am getting. The temps are ok, but those voltages are too high for my liking. I was thinking I would easily be able to get to 4GHz with watercooling, but with these vcore levels there's no way.

Thanks.
 
What motherboard/memory/PSU do you have? With a Swiftech kit, assuming you have at least a single 120mm rad and an Apogee block, I wouldn't think it should hit 52C under load with a 1.46 vcore. My mainly Swiftech kit keeps my D805 @ 4.0ghz (1.55vcore) at 31C under load for a few hours.
 
I am running with an Asus P5B mobo, OCZ platinum memory rev 2 (PC6400) and swifechs dual 120mm rad with the apogee block.
 
I'm new at this so if I say something stupid, ignore me.

Are you getting to 3.6 GHz with a 300 MHz FSB and a 10x CPU multiplier? Or a 400 MHz FSB and a 9x CPU multiplier? I found I can run the latter at a lower Vcore and stay a little cooler. Plus your memory will run @ 800MHz if you have it set for 1:1. I've got an e6700, so it might be happier at lower voltage than an e6600.

I still have a stock cooler, so I can't run a Prime test @ 3.6 GHz. I can load WinXP and just do basic stuff, but as soon as I turn Prime on, the temps shoot over 70C real fast and Prime shuts down (that's a good thing). I can run 90% on Prime @ 3.6 GHz and the temps will stay below 70C.

Tom
 
for me to run stable i had to up my CPU to 1.55v
running at full load i would hit 65C.
I ran Prime95 for 24 hours stable...
no problems
 
Older Week CPU need more volts. What is your CPU built it has something like L29Bxxx the 29 in my case is the week and the B is a B Stepping.

A's also needs more volts

Im currently at 400*9 in my E6600 at 1.4 volts everybody needs different volts i can barely touch 3.8 and i think my problem is my MoBo.

Remember that OCZ Platinum Rev2 Memory are Promos chips that are rated at 2.1v and don't like volts that much.

What are you other settings. NB Volts, MCH Volts, SB Volt. I have a P5W DH MoBo so i don't know what options you have. there are a lot of factors to get to 4ghz. not just WC.
 
WOW ......1.525?
i hit a wall with my ga-965p-ds3 and 6600 @ 3.4 at 1.41 volts. i was scared to go any higher even though my machine is also watercooled.
the highest temp easytune reports is 40 deg cel. but everest ultimate shows that each core is at 60 deg cel. with 100% cpu usage. which one should i believe?
 
I am running FSB @ 400MHz with 9x multiplier.

I've run the RAM at 444 stable in memtest for several hours, so I am not really worried about RAM.

I have also played with NB, MCH and SB Volts. Manually setting any of these doesn't make a difference. Right now I have them set to AUTO except memory and vcore settings.

PSU shouldn't be an issue, I have an 850W OCZ.

CPU batch# is L629B885 and I just noticed that it says 1.35V max! oops.

I am not worried about running a little hotter, but I am concerned about how high the voltage is. I am surprised it's running so hot with watercooling though. I was expecting much lower temps.
 
Source Explanation

Now what I did not show on this latest graph is that from 360fsb to 399fsb the memory was VERY unstable, infact scrolling errors in memtest were the norm in all tests, not just test 5. This proves under the 1067 strap the 965 chipset is hitting the same clock speed limitations as the 975 chipset, the only difference is the board actually still tries to run, on all the 975 boards i have tested once the chipset hits its max clock the boards just give up.

One other thing is 400fsb has an added tweak. 399fsb had memtest bandwidth of 4799MB's but was completely unstable, 400fsb had bandwidth of 4812MB/s and was completely stable... but as soon as I moved to 401fsb bandwidth shot down to 4324MB/s.
This situation reminds me of the old P4P800 turbo mode at 200fsb where Asus forced PAT and a latency change on the chipset to make the boards look good for reviews. I have a feeling the 1333 strap is forced at 400fsb but the latency we see at 1067 strap is still in play maybe...so it may be worth setting 400fsb, boot to windows and clock higher with clockgen for benchmark runs with this board

To finish...if you are clocking 1:1 I seriously suggest you skip 360 to 400fsb and push up from 401, the errors you see are NB related and not the memory in most cases.
Click to expand...

Read that. This guy is the man, 1000x better than me but he explains things well.

Basically step up the FSB above 400 and go from there. Apparently there are alot of memory and NB errors from 360-399 FSB, so skip it.
 
makes sense,
but what would be an acceptable amount of voltage too add to the cpu to get it too clock higher?
I have heard in the past that some boards that don't have the additional power conditioning circuits in them don't overclock well with the higher clocked core2 chips. from this explanation it sounds like anything with a high multiplier is not that great.
bummer.
 
This is the data sheet for the core 2 duo E6600
This doesn’t mean you should run your processor at absolute maximum but the guide line is if it’s stable and within thermal limits you should be ok.
Anything outside of the rated specs is at your own risks.

 
HEY!

If I skip from 360 to 399FSB wouldnt that make my system NOT to boot and crash? :S

Im kinda confused now, I heard that you should increase the FSB by 2's or 3's max.

Sorry Im a noob, explain me if Im wrong
 
the object is to increase the fsb slowly until you cant stabilize your system.
after you get to the higher end 1333 strap you go past that limitation of the northbridge.
test first then crank it up :wink:
 
after 333 your already there.
the limitations of the north bridge are right around this area depending on your motherboard and a little luck.
this simply means after you stabilize your oc lets say at 366 fsb and start to have problems go to 400 or 401+ if your 1:1
 
8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O 8O

I just saw your score with the E6600 and I have to say IM IMPRESSED!!!

you are a real good overclocker! I hope I could just get up to 400Mhz thats my goal! 3.6Ghz with 1:1 with the RAM.

By the way, I plan to overclock without overclocking the RAM. Im not gonna even touch the RAM. Is that good? Will that work?
 
your left with little choice with the increase of the fsb once you get to 400.
your ram should handle that and much more.
3.6 GHz 400 fsb 1:1 is ddr2 800 so OC away.
if you get stuck on your ram.... alot of advise is here and its free 😀
 
You have become my messiah from now on :)

My RAM will support that I guarantee! and I will try to rich 3.8Ghz if everything goes as expected! I assure you that!
 
Well yes I have some things in mind like

Do not pass 1.55 vcore cuz that might make my cpu become hotter than hell and also risk of damage.
Make sure my CPU doesnt go over 55 celsious when in Load (not sure if at 3.6ghz or 3.8Ghz my CPU would reach this temp)
 
61.4C is Intel’s max temp and during dual prime is expectable.
Under normal use even while gaming you will seldom exceed 50C if your cooling is adequate.
 
Ill be using the Zalman CNPS9700
Plus my case is the ThermalTake Tsunami w/ side panel. Just to let you know it has 1 120mm fan in the back, 1 80mm fan in the side door and 1 120mm in the front for the hard drives.

That would keep my CPU cool enough. Still at 3.6Ghz and 3.8Ghz what would be my approx temps?

I forgot to mention that one other thing in my mind is to run Prime95 to check stability.

Finally, just to know, what is your temp in idle and load?
 
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