E8400

Willbo

Willbo

Willbo

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Been looking at the CPUs on OCUK and seen that some are now "guaranteed" to reach a certain speed and on the advert they give a description of what you need to do, for example this is on the E8600;

OcUK is now guaranteeing that when you purchase one of these E8600 processors it will run at 4.00GHz or faster prime stable! In order to achieve this you are required to enter your motherboards BIOS and make the following changes in the CPU section of the BIOS:-
1. CPU Setup - User Defined
2. Multiplier - 10 / Default
3. Front Side Bus (FSB) - 400MHz
4. CPU Core voltage - You might need to take this upto 1.40v maximum but generally 1.38v is fine dependent on the motherboard.​

Going on this basis, what would the basic settings be for upgrading an E8400? Would it be very similar to this? I'm a complete novice to OC'ing and if this could act as a guide to a couple of settings in the BIOS to change I'd be happy
 
What mother board and ram are you running?
Will the 8400 be a CO or EO stepping?
I have just upgraded my system to a Maximus 2 m/b and a 8400 EO cpu.
Currently sitting at 4.2 Ghz 467Mhz * 9 at 1.268V on water.

Let me know and I will try and help.

Matt
 
I'm currently running 4GB (4 x 1) Geil PC2-6400C4 800MHz Ultra Low Latency DDR2 with a Gigabyte GA-P35C-DS3R motherboard.

Would love to get into OC'ing because I've heard about such good OC's on the E8400...if I could push it as high as poss wit my Noctua NH-U12P CPU cooler that would be great and I'd really appreciate your help Matt.

How can I find out about what stepping it is? I bought the CPU back in January of this year if thats any help, and at the time (I know everyones CPU might be different) but people were talking about hitting 3.6ghz + on air cooling
 
If you bought it in January then it's a C0 stepping.

They only started making retail E0 steppings in Week 20 of this year. However, many of the C0 chips were still great clockers, and you should expect a heck of a lot more than 3.6ghz!
 
Would be great if I could...I know every CPU is differen but I've just had a look at your OC Database and noticed that someone has submitted an E8400 on a GA-P35-DS3R mobo with a clock speed of 4104...I know it obviously depends on patience to keep trying and testing to push as far as possible, and obviously the exact batch of CPU and revision of mobo, but that would be great to get anywhere near that.


Just not sure how I go about it
 
hi willbo - if you grap a download of cpuz you will find that program very useful

it will give you the stepping and everything else you need to know about the chip
 
Cool, will have a look for it (the joys of a quiet day in work :))

Just read an E8400 OC'ing guide and was very helpful, did it on a Gigabyte board so should be the same layout as my BIOS which will be useful. They got it to 3.6ghz easily, by changing the CPU FSB, PCI Express Bus and Memory multiplier, but were able to get to 4ghz by changing the CPU voltage as well.

I know my memory is DDR2-800, which will be able to cope with the 2 x multiplier, but if I push my memory beyond, for example...forcing it to run at 890mhz, will the memory be ok?
 
Willbo said:
Cool, will have a look for it (the joys of a quiet day in work :))

Just read an E8400 OC'ing guide and was very helpful, did it on a Gigabyte board so should be the same layout as my BIOS which will be useful. They got it to 3.6ghz easily, by changing the CPU FSB, PCI Express Bus and Memory multiplier, but were able to get to 4ghz by changing the CPU voltage as well.

I know my memory is DDR2-800, which will be able to cope with the 2 x multiplier, but if I push my memory beyond, for example...forcing it to run at 890mhz, will the memory be ok?
Click to expand...

you might be ok on your memory depending on what brand it is

the best way to go about overclocking is to get your memory as close to the manufaturers rating as you can that way it eliminates the possibility of a BSOD due to memory failing - if the memory is set to what it can do and there IS a crash - then its the cpu that is unstable

get the cpu up to speed first then tighten up your memory

when you come to do it - post here with your bios settings and all other relavent info - everyone will help you out

the more info you give the more help you will get in my experience
 
Thought I said earlier, but my memory is Geil PC2-6400C4 800MHz Ultra Low Latency DDR2.

So when I get home tonight if I try and OC to the settings that will take me to 3.6 on OC'ing the CPU alone, and go from there memory wise to see just how high I can take it?
 
The Gigabyte P35 boards are still good overclockers for the Wolfdales.

On my P35-DS3L its running happily on 4Ghz with 1.318v. All other voltage settings are on stock so no uppage on MCH, FSB etc...

My XMS2 is on 2.1v running at 5-4-4-12 at 888Mhz. I also have 4x1Gb sticks.

It might be an idea to have a 120mm fan blowing on your Northbridge Heatsink and memory if you can fit one in.

Your Geil should have no problem hitting 900Mhz. However, it will put more stress on the Northbridge, hence the 120mm fan. ;)
 
didnt know you could get 120mm fans to blow on the northbridge,

Sorry if its a dumb question but I'm new on all this OC since the days of changing a jumper on a sys board set what speed the CPU ran at :)
 
Just sit it on the GFX card pointing at the Northbridge Heatsink.

Heres mine:

4un5.jpg
 
Is that only really necessary if I push everything to the limits? Or just a safe bet to have no matter what?

So far I've changed the CPU Host Freq to 400mhz, set the PCI Express Freq to 100mhz, set the system memory multiplier to 2.00B and set the timing controls for the memory to the timings specified on the memory itself...this has got me 3.6ghz and no real difference to heat and no problems with booting into Vista
 
Well I origionally had it for my E6320 as it was highly overclocked along with the memory. I am getting another cooler shortly but noticed that many coolers now will not give me the room for a 120mm fan so it was pointless telling you as you probably dont have an Akasa Evo 120 anyway.

You're memory is running at its stock speed of 800mhz with 1:1 ratio to the CPU so thats good.

Is you're vcore on auto? Probably is as it may run that speed even on stock voltages. Try for 3.8Ghz (422FSB). I got mine stable with 1.26v through it. Had to slacken my timings a little to 5-4-4-12 on the memory though but kept 2.1v through it.

There was no need to change any of the motherboard voltages (MCH, FSB etc) although every board is different I suppose.
 
I just followed a guide on the internet I found for E8400s for gettin 3.6ghz and that was the settings in the BIOS he changed, so just followed suite to get a rough idea of whats what before experimenting more with peoples help.

Think my vcore is on auto yeah, well the CPU Voltage Control setting is on Normal and the Normal CPU Vcore is greyed out and not able to be changed.

Cant see where I'd change the voltage for the memory.
 
When in the bios, press Ctrl+F1 and the overclocking settings will show.

You can then manually change your voltages for motherboard, CPU and Memory.
 
OK will have a look, does that enable me to change some of the settings then that I couldnt alter before? Because F1 in my BIOS brings up the help I think.

Will give it a go and see what happens because currently I've been using the MB Intelligent Tweakers (M.I.T.) in the Gigabyte BIOS
 
Yup, CTRL + F1 will get all the settings up for tweaking voltages in M.I.T. You may have to manually set the voltages for your memory also.

See what the manufacturer defaults are and check in the bios. I have to set mine to +0.4 to give me 2.1v.
 
OK confused now. Used the following settings, got into Windows but now goes to blue screen each time with memory dump.

The settings I changed are;

CPU Host Clock Control = Enabled
CPU Host Freq = 400
PCI Express Frequency = 100
System Memory Multiplier = 2.00B
DRAM Timing Selectable = Manual
CAS Latency Time = 4
DRAM RAS to CAS Delay = 4
DRAM RAS Precharge = 4
Precharge Delay = 12

And that was it, to give me 3.6ghz, but like I say...I'm getting memory dumps now.
 
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