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Overclock E8400 + P5K-Pro

post #1 of 27
Thread Starter 
Hi guys,

First time post here, I do understand a little about overclocking, I spoke to a friend who helped me choose this specific set up so I could overclock. For the past two years I haven't bothered though. But now I'd like to open it's full potential.

Here's my setup

Motherboard : Asus P5K-Pro
CPU : Intel Core 2 Duo 3.00ghz (Zalman cooler, was advised not to use stock)
RAM : 4 x 1gb Corsair DDR2 6400 (800)
GPU : ATI Radeon HD 4870x2
PSU : Tagan 800w
HDD : 2 x 1tb 3.5" SATA + 1 x 500gb 3.5" SATA
DVD : 3 x SATA DVD-RW drives

Hopefully that covers everything that you will need to know.

Now, I've had a read up on various forums and have found that increasing FSB to 400 then I would be getting 3.6ghz, which I have. Sadly when it attempted to boot Windows it would crash, so I increased vcore to 1.30, which I have tested and all seems stable (tested with Prime 95, highest temp was 53 degrees).

Now, I did try putting the FSB to 443, which set it to 4.0ghz. I understood that it would likely need more voltage, so increased slightly to 1.35, but don't think that was enough as it BSOD when I ran Prime 95.

I have a horrible feeling my memory is holding me back here, I understand my gear is a few years old, and likely out of date but I'd like to open her up a little and get the use while I can.

Could anyone show me the way towards getting 4.0ghz stable? I've checked out all the settings in the BIOS and to be honest, some I have no idea what they are!

If my memory is holding me back then maybe I could upgrade, but I'm still limited to DDR2. Any advice on that, I understand that I can overclock my memory too?

Any way, hope I can push a little harder and reap a little more speed from this!

Thanks for your help!

Jason
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post #2 of 27
Which version of the E8400 do you have? The 65nm or 45nm version (CPU-Z can tell you, if you don't know)?

What are your RAM timings set at and what does the manufacturer say they should be? RAM voltage?

Also, try getting a stable overclock with just one stick of RAM (well, maybe two... I don't think Windows 7 would like only 1GB).

Post what settings in the BIOS you want to know more about, I'm sure the members here can help.
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post #3 of 27
Thread Starter 
I have the 45nm version, a check on the Corsair website shows timings as 5-5-5-18 and voltage as 1.8 (http://www.corsair.com/memory/xms-classic/xms2-ddr2-memory/cm2x1024-6400.html). I was advised on these specs from the information I'd like to be able to overclock all of this. I did buy another 2 sticks of the exact same RAM a few months later, they all should be identical.

I did see on the E8400 Club post, most people getting 4.0ghz + speeds so hopefully I'll be able to get there too. Is it a simple as adjusting FSB and vcore? What about the RAM? I'm curious about overclocking that too, but just aren't sure what's involved.

Thanks for your help, hope the info has helped.

Jason
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post #4 of 27
Well, I don't know how different the P5K is from the P5Q (read: I don't want to find a review of it right now since it's 1AM tongue.gif), but with my overclock I'm letting the BIOS handle overclocking the RAM. All I did for mine was tell it my timings and voltage (5-5-5-15, for me, at 2.1V), and let it do the rest. I notice on the website when I look, it says voltage should be 1.9V for the RAM. Also, is your RAM on the QVL?

If it's the 45nm, I'm surprised you have to run voltage so high. Does your BIOS have a setting called "Load-line Calibration" anywhere? If so, enable that.

Before you do enable it, open up CPU-Z or something similar and post what it says your voltage is. when I'm trying for 4.0Ghz, I have mine set at 1.3V in the BIOS and CPU-Z says I'm at about 1.280 at idle (1.29 under load). I'm curious to see if your voltage is drooping a lot or not.
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post #5 of 27
All E8400 are 45nm. There are two steppings, E0 and C0. The E0 would be the better clocking chips. The difference between a P5k and P5Q is that the P5K is a P35 board and the P5Q is a P45. Surprisingly, a P5K has LLC.
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post #6 of 27
Quote:
Originally Posted by Mikecdm;12491269 
All E8400 are 45nm. There are two steppings, E0 and C0. The E0 would be the better clocking chips. The difference between a P5k and P5Q is that the P5K is a P35 board and the P5Q is a P45. Surprisingly, a P5K has LLC.
Ah, my bad. I knew another 3.0Ghz version of the C2D existed with 65nm and just assumed it to have the same numbers. Thankyou for the correction.

That brings up another question though, what stepping do you have?
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post #7 of 27
Thread Starter 
Right, just got home from work, got my list of answers ready!

Here we go!

My RAM is listed on the QVL, although under DIMM Socket Support it says that "Supports 4 modules inserted into both the yellow and black slots as two pairs of Dual-channel memory configuration" - now I have 4 single 1gb sticks plugged in. Does that have a major impact? But it says " Supports one module inserted in any slot as Single-channel memory configuration" and "Supports one pair of modules inserted into eithor the yellow slots or the black slots as one pair of Dual-channel memory configuration" are OK with this memory (I've checked that the part number matches).

I have the C0 chip, found that in CPU-Z, again is that a major issue? I set my timings in the BIOS, am going to copy all the settings I have so far, will post that as soon as I can.

Thanks for your assistance with this, much appreciated smile.gif

Jason
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post #8 of 27
Thread Starter 
Quote:
Originally Posted by James [a_leon];12495937 
That brings up another question though, what stepping do you have?

In CPU-Z it shows as 6 .... I have no idea what that means though!
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post #9 of 27
Quote:
Originally Posted by hyperjase;12511350 
In CPU-Z it shows as 6 .... I have no idea what that means though!

Meant to ask about revision, sorry. And you gave that in your previous post.

With C0, I'm told those don't like to overclock as nicely.

When you're trying for 4.0Ghz, can you post all of the settings that you have in your BIOS (that would be on the same page you're in when you're setting your voltages and what not)?
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post #10 of 27
Thread Starter 
Here are the settings as I have them for 3.6ghz, I wasn't sure which I needed to change for 4.0ghz.

Ai Overclock Tuner : Manual
CPU Ratio Setting : Auto
FSB Strap to North Bridge : Auto
FSB Frequence : 400
PCIE Frequency : Auto
DRAM Frequency : Auto
DRAM Command Rate : Auto
DRAM Timing Control : Manual
- CAS# Latency : 5 DRAM Clocks
- RAS# to CAS# Delay : 5 DRAM Clocks
- RAS# PRE Time : 5 DRAM Clocks
- RAS# ACT Time : 18 DRAM Clocks
- RAS# to RAS# Delay : Auto
- REF Cycle Time : Auto
- WRITE Recovery Time : Auto
- WRITE to READ Delay : Auto
- READ to PRE Time : Auto
DRAM Static Control : Auto
Transaction Booster : Auto

CPU Voltage : 1.30000
CPU PLL Voltage : Auto
FSB Termination Voltage : Auto
DRAM Voltage : 1.80
NB Voltage : Auto
SB Voltage : Auto
Clock Over-Charging Voltage : Auto

Load-Line Calibration : Enabled
CPU GTL Voltage Reference : Auto
NB GTL Voltage Reference : Auto
CPU Spread Spectrum : Disabled
PCIE Spread Spectrum : Disabled

The only ones I have altered are for the FSB Frequency, DRAM Timing Control, CPU Voltage, DRAM Voltage, Load-Line Calibration, CPU Spread Spectrum and PCIE Spread Spectrum (most of these I have seen in many places as disabled).

Hope this sheds so light on the situation. I did find a post on another forum which showed someone attempting 4.0ghz on the same board and CPU but having problems, I did test these but then for whatever reason it showed my CPU as underclocked.

Thanks for your help!

Jason
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