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E6420 - A few questions

post #1 of 20
Thread Starter 
Hey Guys,

i am in a bit of a confused state of Overclocking my new baby, a e6420.
I have the following further hardware to complement: asus p5b deluxe, zalman 9700, 2x1GB Corsair TWIN2X2048-6400C4 and a 580 Watt Targan PSU.

So, i am currently happily overclocking, at the moment at 2800, 8x350 at 1.325v in the BIOS. The load temps as of this moment are 39/39, so thats nothing i can complain about .
Going up the ladder from 2133 i have however noticed a few things which i cant explain.

1) In CpuZ my vcore is 1.296 when idle and drops to 1.272 on load. this kinda confuses me because firstly, i dont understand why CpuZ gives me a different voltage than i set in the bios, and secondly why it drops on load. Is this something i should worry about? What should i trust when faced with cranking up the voltage to get a few more cylces? CpuZ or the Bios?

2)I have tried two settings involving an FSB of 400, namely 400x6 =2.4 and 400x7 =2.8. Funnily enough each time the PC boots, but Prime95 crashes after a few minutes. I can run 2.4 with multiplier 7 and it stays stable, and i can run 2.8 as i am now with multiplier 8. I just cant run an FSB of 400.

Since i have Ram rated for 400 i dont understand what the issue is. I am not OCing my ram yet, so whats the issue with the 400 FSB?

Any help would be greatly appreciated!

thanks!

Ebsel1
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post #2 of 20
Sometimes CPU-Z has a habit of displaying the BIOS wrong, so don't worry about this. Probably a better program to trust would be CoreTemp, that displays accurate temperature readings as well as the current Vcore. I've always found it very accurate and pretty much identical to the Vcore value shown in the BIOS.

For the second question, that motherboard should have no problem with a 400FSB. You don't need to overclock the RAM to get a 1:1 divider as PC6400 = 800Mhz which is suited for 400FSB perfectly. Maybe you could try loosening the memory timings to 5-5-5-15 or so to try and stabilise the system - it's worth a try

Let us know how you go on loosening the timings. I can't see it being a problem with the CPU or Motherboard, especially at such a rather low clock of 2.4 Ghz.
    
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post #3 of 20
Thread Starter 
thanks for the quick reply!

I will ignore the CpuZ vcore problem, especially since the volts arent giving me any trouble. I still dont get the problem my mobo could be having with the 400FSB, coz as u said my memory is rated for it. I am now at 3.08 with 8x385, and again things are running smoothly. [edit] with smoothly i mean 42C load temps.
that damn fsb 400 will get me again though at 3.2, i know it!
I will get back to ya with the lowered Ram timings. Could it maybe also be the Ram voltage thats causing an issue? its rated for 2.1v and thats what ive set it at.
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post #4 of 20
Thread Starter 
ok, so the same problem persists:

i set FSB to 400, multi to 8 giving me 3200 and ---- slap---- Prime95 freezes within seconds of starting. I lowered the Ram timings as you suggested but that doesnt seem to help.
now while writing this i lowered the FSB to 395, multi still 8 and smooth sailing it is at 41 load.

So, i though maybe some other settings must be wrong. The ones which came to mind which i set in ignorance and, basically, to not mess things up are all at their lowest possible setting:

NB voltage: 1.25
SB voltage: 1.5
FSB termination voltage: 1.2
ICH Chipset voltage: 1.057

Is one of these maybe the cause for the unmotivated FSB400? I really dont want to try more than FSB400 as i never really intended to OC extremely and 3.2 is a very nice result imho. But i would really at least run the memory at its specs.

If you got some ideas i would appreciate it!
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post #5 of 20
NB voltage: 1.45v
FSB Termination voltage: 1.4v
ICH chipset: 1.2125v
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post #6 of 20
Yo Ebsel! Mein kleiner Clockerihno (Sry.... too fertich gestern^^)

Anyway,.. so far so good eh,... except for the 400.. which is pretty strange...

That board is supposed to have a fsb hole right? Sooo,... maybe it's at 400??? What I would try is setting everything else really loose,... Mem ferquency (divider) & timings, and the CPU MHz,... and then test purely the fsb of the board, any maybe try going above 400,... 450 or so,... ?? How far have others pushed it??? Maybe try and find a board-specific thread...

In fact NB voltage might help. That's closely linked with FSB. Give that a try too...

Sonst fällt mir da grad au nix ein...


Gück mal noch hier: http://www.xtremesystems.org/forums/...d.php?t=112648 und hier: http://www.xtremesystems.org/forums/...d.php?t=115217
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post #7 of 20
Yes 400 is where the strap is suppose to change over and they have been known to have a hole there, try 410 415 420 well you get the point.

Guess thats German huh
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post #8 of 20
Thread Starter 
i now changed the voltages according to acoma_andy's specs and have been running 3.2 400x8 for 10 minutes. I know that isnt for along time to test stability, but it used to always kick me after 1-2 minutes, so things are looking on the up and up!

on testing the boards fsb, i havent gone above 400, simply because i thought that if 400 wont work, why should 420. But i will give it a shot. I mean its running at 3.2 at smooth 40C load at the moment, so theres still much room. that zalman 9700 may be HUGE (i had to take off a case fan coz the case cover wouldnt fit otherwise^^) but it sure does one hell of a job!!

Did I get a winner or what?? Been reading ppl are having trouble getting their e6420 even to post at 3.2 with a vcore of 1.5, and i am still running the stock 1.32v

ill keep you posted!
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Happy Sunshine
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post #9 of 20
Ebsel1, you need to fill in your system specs, so we know what kind of mobo, RAM, PSU, etc. you are running.
    
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post #10 of 20
Thread Starter 
will do captain!
but read the initial post^^
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Happy Sunshine
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