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e6750 need help to oc to 3.2 ghz

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post #11 of 18 (permalink) Old 05-17-2018, 02:36 PM
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all easy fixes

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post #12 of 18 (permalink) Old 05-17-2018, 03:01 PM
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I needed 1.28v for 3.2Ghz back in the day for my E6750.
Add +0.2 on the NB over stock and increase the CPU VTT to 1.35v and see where that leads you.
You're also probably crashing because you're trying to run CAS 4 at 750Mhz, not to mention with different sticks.
Try 5.5.5.18. I bet you'll be able to get 400Mhz with a multi of 8 for 3.2Ghz and a nice round 800Mhz on the rams.
From there on, up the NB freq until it crashes, up the NB voltage and core voltage and if none help, up the VTT voltage as well and see where that gets you.
Don't go over 1.45v for the CPU, VTT or 1.5v for NB. Keep the case as ventilated as possible.
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post #13 of 18 (permalink) Old 05-17-2018, 03:35 PM - Thread Starter
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Quote: Originally Posted by Cryptedvick View Post
I needed 1.28v for 3.2Ghz back in the day for my E6750.
Add +0.2 on the NB over stock and increase the CPU VTT to 1.35v and see where that leads you.
You're also probably crashing because you're trying to run CAS 4 at 750Mhz, not to mention with different sticks.
Try 5.5.5.18. I bet you'll be able to get 400Mhz with a multi of 8 for 3.2Ghz and a nice round 800Mhz on the rams.
From there on, up the NB freq until it crashes, up the NB voltage and core voltage and if none help, up the VTT voltage as well and see where that gets you.
Don't go over 1.45v for the CPU, VTT or 1.5v for NB. Keep the case as ventilated as possible.
Edit: Btw i also have the same graphic card. But i can't oc it.Sparkle editon.

My lowest cpu volt is 1.35 which goes min and max as 1,328-1,376 if i use that


Made VTT FSB volt 1.35
Made Cpu volt 1.40
Made NB volt 1.375
Made the rams 5 5 5 18 it crashed
Made the rams normal (auto) it crashed

It is not even fully stable at 3.0 ghz Always fails prime 95. But pc works normally.

But at 3.2 ghz it crashes or fails prime95 in seconds. I don't think my pc can run at 3.2ghz no matter what.

Now testing 2.8 ghz with 4 4 4 15 ram speeds to see if it fails prime95 even once.

Adding ram pictures since i don't think they are different inside. 2t one has a better cooling add-on.
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Last edited by Xentios; 05-17-2018 at 04:12 PM.
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post #14 of 18 (permalink) Old 05-17-2018, 04:09 PM - Thread Starter
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Well 30-60 minute of no error in prime 95 (I know you like 24 hour test but this is enough for me)

2.8 Ghz 7*400 mhz.
400*2 mhz 4 4 4 15 rams with 2t , 42 trfc
1.350 V Cpu
2.00 V Ram
Auto everything else

Max NB temp=78
Max Core temps=72 each (tjmax 95)
Motherboard Temp= 38-39

So my full stable stats are these.
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post #15 of 18 (permalink) Old 05-19-2018, 05:20 AM
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Quote: Originally Posted by Xentios View Post
Well 30-60 minute of no error in prime 95 (I know you like 24 hour test but this is enough for me)

2.8 Ghz 7*400 mhz.
400*2 mhz 4 4 4 15 rams with 2t , 42 trfc
1.350 V Cpu
2.00 V Ram
Auto everything else

Max NB temp=78
Max Core temps=72 each (tjmax 95)
Motherboard Temp= 38-39

So my full stable stats are these.
This seems like a definite motherboard limitation. The E6750 should easily do 3.2Ghz no matter what.
What mobo are you running anyway?
The pic I posted was on a Gigabyte P35 DS3.

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post #16 of 18 (permalink) Old 05-19-2018, 10:39 AM - Thread Starter
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Quote: Originally Posted by Cryptedvick View Post
This seems like a definite motherboard limitation. The E6750 should easily do 3.2Ghz no matter what.
What mobo are you running anyway?
The pic I posted was on a Gigabyte P35 DS3.
Msi p35 neo . Don't know why lowest Cpu core Volt is 1.35 V but if i wan't i can go to 2.5 V to burn my house . max Cpu core volt is over 2.5 V. I actually wonder what will happen if i give 2.5 v to my cpu : )
http://www.pc-specs.com/mobo/MSI/MSI...ompatible_GPUs
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post #17 of 18 (permalink) Old 05-20-2018, 06:09 AM - Thread Starter
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Ok i think i found my problem which is bad news for me.
E6750 is 60 W cpu
Board is 4 pin cpu power connector supports max 95 W

http://www.coolermaster.com/power-supply-calculator/

Using TDP %100

All empty watts=113 W
e6750 with 1,2 V=179 W (Diff 66 that means cpu uses 66 W)

e6750 with 1,35 V=191 W
2800 MHZ 1,35 V =195 W
3000 MHZ 1,4 V =207 W (diff 94 W which pc works normal but prime 95 errors)
3200 MHZ 1,4 V=213 W (diff 100 W) which 4 pin connector or MB can't handle.


this will ruin my 771 mod plans too : (

Edit: this does not explain why this does not work though
3200 MHZ 1,35 V=206 W (diff 93)
Maybe not that accurate.

Last edited by Xentios; 05-20-2018 at 06:18 AM.
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post #18 of 18 (permalink) Old 12-12-2019, 01:20 PM - Thread Starter
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Hello guys, i don't know people are still interested in old systems. Sorry if this is considered uping old posts.

I am using the same rams with a different motherboard now.

My problem is now Cpu-Z reads DC Mode as Asymmetric instead of symmetric.

New motherboard is
Asus P5K SE
BIOS: 0604

Cpu different for now. I will use a Xeon in future.

Also i set tRFC 42 at bios (which is max setting) but in windows CPU-Z reads as "54 clocks"

System is stable for now. I know nobody uses old pc anymore so this will be a self documentary post if it is allowed.
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