Overclocking e6550

Intel/ Patriot viper
August 17, 2008 at 15:41:49
Specs: Vista, e6550/DDR2 1066MHz

Okay this is my first time overclocking and I want to take my e6550 to 2.8-3.0Ghz on my gigabyte GA-P35C-DS3R. All settings are as it was when I just installed everything.



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August 17, 2008 at 15:52:10

To get your CPU up to 2.8GHz, lower the RAM speed from DDR1066 to DDR667, lock the PCI-e at 100MHz, & raise the CPU freq from 333MHz to 400Mhz.

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August 17, 2008 at 16:00:08

Underclocking the RAM to DDR2 800 MhZ and setting the FSB to 1600 MhZ(400 MhZ system clock) gives you 2.8 GhZ since the E6550 has a multiplier of 7. You probably won't have to change any voltages to get that to work and be stable.

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August 17, 2008 at 18:36:28

Okay when I went to my bios the multiplier was set at 6x. Whats up with that?

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August 17, 2008 at 18:51:25

You have to change some AUTO settings in the BIOS to manual. It depends on your motherboard.

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August 17, 2008 at 19:07:10

okay i've tried everything, this is what my bios looks like:

Robust Graphics Booster [Auto]
CPU Clock Ratio [6x]<--wont let me change
CPU Host Clock Control [Enabled]
CPU Host Frequency [200] <--wont let me change
PCI Express Frequency [100]
C.I.A.2 [Disabled]
System Memory Multiplier [Auto]
Memory Frequency 667 400 (haven't put new ram in yet, was checking out what I have to do first)

The rest is the voltage settings which are either set at manual or normal. What could it be? Is it because I still have junkie ram in?

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August 17, 2008 at 19:44:49

I don't know what you mean by "junkie RAM". With the CPU at default settings (7 x 333), all you need is DDR667. For overclocking purposes, you need either DDR800 or DDR1066 but before you begin overclocking the CPU, the RAM should be manually underlocked to DDR667 & you have to disable the "CPU Host Clock Control"


Study the BIOS chapter in your manual.

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August 18, 2008 at 12:35:10

I mean't I'm only using ddr2 667 ram right now, I was checking things out before I overclock with the higher end ram. Okay the cpu is at (6 x 200) and it wont let me change the multiplier or cpu frequencies. Why is this? I set the CPU Host Clock Control to disabled like you said. But I still don't know how to manually underlock ram. Im really sorry if you're losing your patience.. this is my first time doing any of this. And I went through my manual it just explains what everything is, which I generally already knew.

Much appreciated


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August 18, 2008 at 15:09:34

"I'm only using ddr2 667 ram right now"

You should still be able to overclock slightly...it would be good practice.

"the cpu is at (6 x 200) and it wont let me change the multiplier or cpu frequencies"

Are you 100% sure about that? So your CPU is running at 1.2GHz instead of 2.33GHz? Are you 100% sure you have an E6550? Do you have CPUZ? If not, download, unzip & run it, then report back what's listed about your CPU:


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August 18, 2008 at 15:29:52

Sorry, my mistake in response #6...the "CPU Host Clock Control" needs to be ENABLED. Here's what your settings *should* look like BEFORE overclocking:

Robust Graphics Booster - Auto
CPU Clock Ratio - 7x
CPU Host Clock Control - Enabled
CPU Host Frequency (MHz) - 333
PCI Express Frequency(MHz) - 100
System Memory Multiplier (SPD) - 2.0
C.I.A.2 - Disabled

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August 18, 2008 at 19:01:37

Okay I did what you told me in the first place and here is what my bios looks like:

CPU Clock Ratio- 7x
CPU Host Control- Enabled
CPU Host Frequency- 400
PCI Express Frequency- 100
System Memory Multiplier- 2.0
Memory 800 800

okay but CPU-Z says:
Core Speed 2400MHz (generally stays there)
Multiplier- 6x
Bus Speed 400MHz
Rated FSB 1600MHz

So I dont know why they're different, and yes CPU-Z says Intel Core 2 Duo R6550 @2.33GHz

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August 18, 2008 at 19:03:02

Oh and CPU-Z says my ram is at 1:1 ratio

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August 18, 2008 at 19:13:17

CPU-Z is not reporting your overclock. Try a program like Everest Home Edition at http://www.lavalys.com/

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August 18, 2008 at 19:21:15

Wow! It worked ahaha. Thank you so much everest report 2800 clock speed!! Just for curiosity sake what would I have to do to voltages to push it to 3 or past 3Ghz when I get better cooling? Last question I swear lol.

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August 18, 2008 at 19:28:10

Take the FSB up to about 1800 MhZ, which would take you past 3.0 GhZ. I'm not sure what you would have to do with the voltages, though. I'm not sure your mboard would accept 1800 MhZ for the FSB. In that case, reboot and change it back in the BIOS.

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August 18, 2008 at 19:37:59

"CPU-Z says my ram is at 1:1 ratio"

Excellent, that's exactly what you want.

Are you running the DDR667 at 800MHz? or did you install the DDR1066?

What is your CPU temp? You probably don't need an aftermarket cooler. To get your CPU up to 3.0GHz+, just leave all the settings as they are except the CPU freq. Raise it from 400MHz to 430Mhz.

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August 19, 2008 at 12:43:15

Yup installed the DDR1066, Okay before I change it from 400MHz to 430MHz will I need to change voltages? Oh and went into my bios and system temp was 41 degrees and cpu was 31 degrees. From what I see thats pretty cool but then again it wasn't under load and hadn't been running for long.

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