How can I overclock my Intel E6750 higher?

[Ensimilia]

Hey guys
I'm wondering how I can overclock my Intel Core 2 Duo E6750 higher than i have so far.
I would like to get it up to 4Ghz. The highest I could reach so far was 3.70Ghz. If i set the FSB higher than 475x8 it reverts the settings and goes back to 2.66Ghz (333x8).

Of course I have invested in my system in order to do this:
- I replaced the intel stock cooler with a Cooler Matser Hyper TX3 Evo.
- I bought faster 4GB DDR3-1333Mhz CL 9 RAM instead of the 4GB DDR2-800Mhz CL5.

Here's a CPU-Z validation link of my highest overclock so far of 3.70Ghz: http://valid.x86.fr/hd3te8
At 3.60Ghz it was stable in Prime95 for 8+ hours without an error.

What settings do I need to adjust to reach 4Ghz? When I increase FSB higher than 475x8 it goes back to 2.66Ghz, how can I prevent this from happening?
I already have advanced BIOS features like Thermal Monitoring and Enhanced Halt State set to [disabled]. As you can see here: http://i.imgur.com/d8AarYv.jpg?1

PS: As you can see here there are alot of people who managed to OC their E6750 higher than 3.70Ghz so it is perfectly possible: http://us.hardware.info/productinfo/2142/intel-core-2-duo-e6750/overclock

My PC specs:
CPU: Intel Core 2 Duo E7650 (2.66Ghz stock speed)
GPU: XFX Geforce 8500 GT
RAM: Corsair XMS3 4GB (2x2GB) DDR3-1333 CL 9
Mobo: Gigabyte P35C-DS3R
HDD 1: Seagate Barracuda 7200.10 250GB 7200RPM
PSU: Aopen Z400-08FC 400W
OS: Windows 10 Home 32-bit

Any help would be much appreciated :)

[Ensimilia]

Ok but how can i disable that it goes back to 2.66Ghz automatically?
Do you think this will be solved by itself by going for a better cooler like the Sycthe Mugen 4 ?
I have set PCI express frquency to 100Mhz now.

[Brimac]

How much money are you willing to dump into a system that you said were going to sell ?
You allready got a good oc with the parts you have, 400-450fsb is really good on a P35.

[Ensimilia]

The TX3 Evo cost me € 24,99 but if I can have it exchanged and then pay the price difference for the Sycthe Mugen 4 which is € 49,99 it will only cost me € 25.

https://www.alternate.be/Scythe/Mugen-4-PCGH-Edition-CPU-koeler/html/product/1097611?tk=7&lk=6098

[_I_]

instead of failing to follow overclocking steps
just sell it at stock speeds and say its overclockable
and let the next person follow directions on how to overclock it properly

[Ensimilia]

I'm overclocking it for the fun of it. And I probably won't sell it because it will be hard to make a profit from it. I'd rather keep it as a decent backup pc.

You are saying i'm failing to follow overclocking steps. But can you tell me what I'm doing wrong then? I have read numerous overclocking guides about dual cores by now but still can't push it higher than 3.72Ghz.

[_I_]

fsb overclock in small steps, 5-10mhz at a time

first lower the fsb back to stock 333mhz
and the ram mult to its lowet value, probably 666 or 533
and the core voltage back to stock

test with prime95 blend for 15+ minutes
max temp is around 65c

after 15+ minutes of prime95 blend test
temps low and its stable = raise fsb by 5-10mhz
temps low and its unstable = raise cpu core voltage by .05v
temps high and stable = lower core voltage by .05v
temps high and unstable = stop overclocking and go back to last good resutls, thats as high as you can go

[Ensimilia]

Lowest ram multiplier I can use is 2.00 so that equals to 667Mhz.
I will try everything you said right away. But you didn't say anyhting about the ram timings, what do I do with those? Leave it at auto or set it to manual and to default which is 9 - 9 - 9 - 24 for my RAM. Or do ram timings not matter at all?

First question: Leave ram timings at manual and set them to default (9-9-9-24) or leave it at auto?

Second question: What about RAM voltages? When do I need to start tweaking those?

[FluffyPinkDecoyBunny]

Regardless of what others have achieved with their E6750, you're not guaranteed to reach those same results. Buying other equipment to use to try to achive something higher than you've already hit is a waste of money.

My Phenom II x4 940, with a Cooler Master Hypter 212+ I was able to hit 3.6GHz. My case at the time (Cooler Master Cosmos 1000) had poor air circulation and it limited the ability of the 212+. I got my hands on a Corsair H50 for about $30 and it provided a better cooling soltuion in my tower. I was able to hit 3.712, but that's with cranking the voltage to the max limit of 1.55V. I settled for 3.6GHz on 1.4875V. The extra voltage to actually reach 3.712 wasn't worth it in my book.

If I only cranked on the FSB, instead of the multiplier, I could get upwards of 3.6. However, that meant to adjust timings on the RAM and to make sure the PCI-E lane wasn't adjusted and to keep the northbridge OC between 1800MHz (stock speed) and 2100MHz (was unstable at this speed without a big bump in voltage). I did extensive testing on benchmarks and I saw no worthwhile difference from upping the FSB or the multiplier. I stuck with just upping the multipler since it was a lot less hassle.

Anyway, once you tend to hit an unstable spot for OC'ing, unless you can really apply a better cooling solution and crank the voltage, you're really not going to get a better result.

[Ensimilia]

引用自 FluffyPinkDecoyBunny：

Anyway, once you tend to hit an unstable spot for OC'ing, unless you can really apply a better cooling solution and crank the voltage, you're really not going to get a better result.

1. I have bought the wrong cooler, the TX3 EVO is barely better than the intel stock cooler. I could have bought a Sycthe Mugen 4 or even a Cooler Master V8 GTS.

2. I can still crank the voltage higher to 1.8V or 2.0V but for 2.0V I will need a really better cooling solution because at 2.0V I was starting to reach Tjmax of 100°C.

引用自 _I_：

fsb overclock in small steps, 5-10mhz at a time

first lower the fsb back to stock 333mhz
and the ram mult to its lowet value, probably 666 or 533
and the core voltage back to stock

test with prime95 blend for 15+ minutes
max temp is around 65c

Update: I did what you said and Prime95 has now been running for 28 minutes at stock FSB with stock voltage and temperatures peaked at exactly 65°C. I monitor my temps with the latest version of RealTemp. I will now start raising the FSB in 10Mhz increments and each time let Prime95 run for 15+ minutes.

[_I_]

stock ddr2 ram voltage is 1.8v
keep it there

your cpuz ss shows the ram at x1 = same as fsb
with the ddr2 800 dimm dont go much over a fsb of 400

you can test to see how fast the ram can go by doing the above, and lower the cpu multi to x4-6
to reduce the cpu overclock and just oc the ram to find out its failing point

[Ensimilia]

引用自 _I_：

stock ddr2 ram voltage is 1.8v
keep it there

your cpuz ss shows the ram at x1 = same as fsb
with the ddr2 800 dimm dont go much over a fsb of 400

you can test to see how fast the ram can go by doing the above, and lower the cpu multi to x4-6
to reduce the cpu overclock and just oc the ram to find out its failing point

Nonono xD i'm using this RAM now: Corsair XMS3 4GB (2x2GB) DDR3-1333 CL 9
The DDR2 RAM was in there previously. Now it's DDR3-1333Mhz.

[_I_]

check the ram xmp profiels with cpuz spd tab, select the dimm

if its rated for 1.5v, its safe to run it to around 1.7v

[Ensimilia]

It's rated at 1.5V that's what it was running at in CPU-Z at stock voltage. My RAM does not support intel XMP. I'm going to the shop now to try to exchange the cooler for a better one :D

[Ensimilia]

Hey guys I was able to exchange my CM TX3 EVO cooler for a Scythe Mugen Max which is supposed to be even better than a 212 EVO or a Scythe Mugen 4. I just ran Prime95 for 30minutes and temperatures peaked at only 60°C. I will start overclocking now in small steps making my way upwards from 2.66Ghz using the advice that _l_ gave me.

Here's a pic of the Sycthe Mugen Max + optional second fan that I bought along with it in my system. [i.imgur.com]

[Ensimilia]

I isolated the problem:
What happens is when I go over 3.80Ghz (475x8) the "CPU Host Clock Control" resets itself to [disabled].
I have advanced BIOS feautues like "CPU enhanced halt", "CPU thermal monitor 2" & "CPU EIST" already set to [disabled].

Here's a picture:
http://www.overclock.net/t/1570163/lightbox/post/24315061/id/2556932

Does anyone know how to prevent this from happening? I already updated to the latest BIOS version and I checked all the hidden BIOS options. =(