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Can't get my E6750 from 3.4ghz to 3.6ghz

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January 18, 2010 2:58:27 PM

I've recently started overclocking my E6750 (after installing a zalman CNPS 9700). Getting to 3.4ghz was easy, but now i'm trying to get it to run at 3.6ghz and i'm running into a few issues. The max clock speed i've got to is 3.52ghz, to do this i have had to raise the vCore to 1.38v from 1.35v. Heat isn't really a problem, i've got good airflow (temps go up to about 56C after running prime95).

As soon as i raise the FSB to 445mhz, that's where the problems start, after running prime95 for 2-3 mins my comp shuts down. I've tried raising the vCore to 1.4.. same thing happens. I've tried raising the FSB voltage slightly, that doesn't work.

Is this the end of the road for my e6750? Or am i missing something? :pfff: 

P35-DS3P
E6750 @ 3.52ghz (440mhz x 8) vCore 1.38
4GB Corsair DDR2 880mhz (keeping FSB : DRAM at 1:1 )

More about : e6750 4ghz 6ghz

a b K Overclocking
January 18, 2010 3:37:46 PM

Well, have you tried raising the nb voltage? You may need to because the FSB is extremely high.
January 18, 2010 3:56:27 PM

You don't specifically say, but I'm guessing your RAM is DD2-800? Don't forget that they are getting overclocked as well when you increase the FSB. They may need a voltage bump or looser timings or both to keep going.
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a b K Overclocking
January 18, 2010 4:01:32 PM

Im assuming that you dropped the ram ratio to 1:1, or disconnected it from the FSB?
January 18, 2010 4:49:42 PM

Yep, my RAM is DDR2 - 800mhz. I've got it at 1:1 so it's up to 900mhz now (fsb 450mhz). I've upped the DDR voltage to 2.0v from 1.8v. I'm guessing that should be enough? After reading overshocked's reply i've upped the nb voltage by 0.1v, but i'm not sure how far i can go with this. Going to run prime95 again.. will let you know how that goes.
January 18, 2010 5:08:41 PM

Same thing, prime 95 runs for 2-3 mins and then my comp shuts down. At this point i'm wondering whether it's even worth trying to squeeze an extra 200mhz out of the cpu...
a b K Overclocking
January 18, 2010 5:32:07 PM

Na, this is the ram.... ram doesnt overclock very well.
January 18, 2010 5:53:49 PM

Are you sure about that? I had it running at 1050mhz(or something near that) before I started running into problems. I then adjusted it to run at 1:1 as I thought this might have been the problem.
a b K Overclocking
January 18, 2010 5:55:34 PM

Another thing to try is to check if the motherboard is limited to 440 FSB, bring down the multi one tick from 8x to 7x, then see if you can bump the FSB a little more. that'll rule out if it is the CPU or the motherboard to be the limiting factor.
a b K Overclocking
January 18, 2010 5:56:08 PM

WOW, lol nice ram. most doesn't pass 850. Did you stress test it at 1050?
January 18, 2010 6:00:14 PM

Yes, this is what it was running at when I had the cpu running at 3.4ghz. Prime95 ran all night no probs..
a b K Overclocking
January 18, 2010 6:07:33 PM

Loosen your RAM timings. Your motherboard may have tried to shorten them when you set the Ratio at 1:1. Also, raise the NB voltage slightly.
January 18, 2010 7:56:29 PM

Currently the timings are set to 5-5-5-18. Would 6-6-6-20 be ok? Also, how much can I raise the NB voltage by? My Mobo is GA-EP35-DS3P, I'm not sure what the default voltage is.. I've searched on google but can't find it anywhere
January 19, 2010 6:13:12 PM

jonpaul37 said:
Another thing to try is to check if the motherboard is limited to 440 FSB, bring down the multi one tick from 8x to 7x, then see if you can bump the FSB a little more. that'll rule out if it is the CPU or the motherboard to be the limiting factor.


Thanks for your comment Jonpaul, as a noob overclocker I never thought of trying this. Well I've tried it, raised the FSB to 450, dropped the multiplier to 7x, raised the vCore to 1.45v and raised the FSB, RAM and NB voltages to make sure that they weren't causing the problem and after 5 mins of running prime 95 I got the blue screen...

Now the FSB is at 440mhz with 8x multiplier, vCore is at 1.38v and all the others are set to standard, ran prime95 for an hour and no problems, so I'm assuming my motherboard or cpu are to blame. Oh well, 3.52ghz still isn't bad.

Thanks to all for the input! :D 

a b K Overclocking
January 19, 2010 6:21:57 PM

that would mean that the Motherboard is the limiting factor and will not like anything higher than the 440 FSB. The CPU could potentially go higher but it may not be worth getting another motherboard to test it, LOL, plus, 3.52 is more than enough. :D 
a b å Intel
a c 197 K Overclocking
January 19, 2010 6:42:16 PM

It's also very possible that you have simply reached the limit of the chip.
a b K Overclocking
January 19, 2010 6:57:39 PM

jsc said:
It's also very possible that you have simply reached the limit of the chip.



If he lowered the multi to 7x from 8x, wouldn't he have a little more room to up the FSB a little more as he would be @ 3.02 as opposed to 3.52? Or are you meaning that the CPU does not like higher than 440 FSB?
a b å Intel
a c 197 K Overclocking
January 21, 2010 1:48:05 PM

I was talking about the CPU core itself. It may not be able to run faster than 3.5 GHz.
February 24, 2010 3:30:01 AM

Not all chips can run at those speeds. You gonna have to live with it... (or get a faster CPU).
a b å Intel
a c 197 K Overclocking
February 26, 2010 12:19:47 PM

A clear case of YMMV.
February 26, 2010 10:13:33 PM

My E6750 is maxed out on 465FSB, on 466FSB it just doesn't POST.
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