E8400 (E0) wont post on 423x9

Lower the multi and try and find your max fsb as suggested. It may well be that 419 is your max.

I had a x38 mobo that wouldn't do a single mhz above 419 yet with a p45 mobo the same cpu was fine at 489Mhz. :eek:

p43 aren;t the best boards and it could be 419 is your limit. Also it could just be a "hole" where a certain range of fsb values don't work. Hence try the lower multi and put your memory on the lowest multi and loosest timings for now as well.

Try a 6x multi.

If 420+ is stable then you know the problem lies elsewhere. If 420 x 6 is unstable/refuses to boot then try 430 or even 440. This will discount the "hole" problem.
 
I'll give lowering the multi and ram timings a go. The only trouble is my ram is on its lowest multi as is and is already running above its 800mhz rated speed.
 
Goose said:
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Goose said:
trouble is my ram is on its lowest multi as is and is already running above its 800mhz rated speed.
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Hey Goose . . . have you pre-tested your ram to see how far it will overclock? . . . XMS2 PC2-6400C5 running at DDR2-838 :D

If you reset your BIOS back to stock . . . then select 333MHz-FSB along with the memory set at 400MHz (DDR2-800) this will set the memory multiplier to [6:5] which will allow you to slowly raise the FSB from 333MHz upwards and immediately start sending the memory into orbit while keeping everything else quite sedate . . . find the limits of your memory before trying to work out the FSB clocks and the CPU clocks . . .

** Memtest86+ V4.10

  • 333MHz-FSB [6:5] 400MHz (DDR2-800)
  • 340MHz-FSB [6:5] 408MHz (DDR2-816)
  • 345MHz-FSB [6:5] 414MHz (DDR2-828)
  • 350MHz-FSB [6:5] 420MHz (DDR2-840)
  • 355MHz-FSB [6:5] 426MHz (DDR2-852)
I think you will probably find its the memory holding you back . . . DDR2-800 isn't that great for LGA775 clocking . . . running the [1:1] sync memory ratio is not ideal . . . see how you get on! :cool:
 
Thanks for the advice Wayne, i think[/] i understand what you said. I'm not entirely clear on what you mean by 'memory set'. Do you mean the MCH Frequency Latch or the System Memory Multiplier?

Thanks
 


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Hello Goose,

I'm referring to the System Memory Multiplier . . . as your using an Intel® Core™2 Duo E8400 which is a native 333MHz-FSB chip alongside some 400MHz (DDR2-800) memory the system will "default" the memory multiplier to [6:5] in order to get your memory running at the correct speed . . . like so:

  • 333MHz-FSB [6:5] 400MHz (DDR2-800)
The FSB is running at 333MHz but the memory is running at 400MHz? . . . the reason the memory is running faster is due to the System Memory Multiplier . . . heres the maths:

333 FSB multiplied by 6 then divided by 5 . . .

or put simply:

333 x 6 / 5

[6:5]

You will only see this [6:5] figure mentioned in CPU-z . . . you won' see it mentioned in the BIOS . . . the BIOS will only show you the effective DDR2 rating . . . to confuse matter even more CPU-z lists it back-to-front . . . so [6:5] appears as [5:6] :p

so as you change the FSB (333MHz) upwards the maths will change and so will the speed of your DDR2 . . . using this method you will be able to quite easily overclock the ram past its rated 400MHz and see how it holds up while at the same time keeping the rest of the system running fairly normally . . . essentially what you need to be doing is slowly changing the FSB (or CPU Host Frequency as its called in your boards BIOS) upwards from 333MHz and keeping an eye on the Memory Frequency (shown as effective DDR2 speed in your boards BIOS) . . .

  • 333MHz-FSB [6:5] 400MHz (DDR2-800)
  • 340MHz-FSB [6:5] 408MHz (DDR2-816)
  • 345MHz-FSB [6:5] 414MHz (DDR2-828)
  • 350MHz-FSB [6:5] 420MHz (DDR2-840)
  • 355MHz-FSB [6:5] 426MHz (DDR2-852)
  • Etc . . .
  • 371MHz-FSB [6:5] 445MHz (DDR2-890)
download and create a bootable Memtest86+ V4.10 (linked in previous post) and give your sticks a test after each incremental adjustment . . . once you know what the sticks are capable of (and with what vDimm/timings etc) you will be in a much more "informed" postition to be able to overclock the rest of your system (FSB-MHz & CPU-MHz) . . .

Good luck! :cool:
 
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The results are in (sort of). I reset my BIOS settings to default and then began upping the FSB and nothing else.

I got to 390 with it posting fine and then tried 395 at which point it did something i've not seen yet. Instead of not posting like normal, it began continously beeping before restarting, failing to post like normal (i.e just restarting) and then restarting again with dual bios kicking in. At which point it went back to normal.

2wq61k0.jpg


I'm just about to head out so i dont have time to create a bootable memtest and then set it running so i'll stick prime95 on blend and see what happens.

The vcore is auto which i guess is why it's 1.3.
 
Well, blend failed before i'd even got out of my seat. What would you suggest now? Loosen timings (and if so, to what?) and/or increase volts to see if it becomes stable?

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Hey Goose,

the idea was to start at 333MHz then bump it up, memtest, bump it up, memtest, bump it up, memtest etc etc

I didn't expect you to go straight in at 390MHz-FSB and then run Prime! :D
 
Sure, i understand that. I was short on time though so i thought i'd get it as high as could (before it wont post) and see what happens :)

I do have a question though: at 419x9 with a 1:1 ratio (ram 419mhz/DDR-838) i have a perfectly stable system. If i go to 420x9 with ram now at 420/DDR-840 it wont even post.

However, with the 6:5 ratio i can get the computer to post with ram at 468/DDR-936. Granted it crashes after 10 seconds of prime but the reason im confused is that the computer will post/not post with wildly different speeds (420 vs 468).

Now i freely admit i dont know what the hell i'm talking about, i'm just struggling to get my head around it all :)

Thanks for all your help, Wayne.
 
Goose said:
Sure, i understand that. I was short on time though so i thought i'd get it as high as could (before it wont post) and see what happens :)

I do have a question though: at 419x9 with a 1:1 ratio (ram 419mhz/DDR-838) i have a perfectly stable system. If i go to 420x9 with ram now at 420/DDR-840 it wont even post.

However, with the 6:5 ratio i can get the computer to post with ram at 468/DDR-936. Granted it crashes after 10 seconds of prime but the reason im confused is that the computer will post/not post with wildly different speeds (420 vs 468).

Now i freely admit i dont know what the hell i'm talking about, i'm just struggling to get my head around it all :)

Thanks for all your help, Wayne.
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When the computer is failing to post at the 420/840, its probably failing due to the fsb being quite a lot over stock settings, and not the memory, as you have seen your memory will go fairly high all be it not stable.

Also when testing for highest memory speeds, its allways best to just set the timings to auto, and the computer will slacking the timings when needed by itself.

About the continual boot sequance, where its boots, and reboots in a loop, thats the motherboard testing settings, and if the mobo feels the settings are incorrect, or just won't work, it won't let it pass, and there for fails it, and sets stuff back to normal. Its quite normal, but if you have never seen it can worry people, just means you are at the edge of the limits, and either have to back down, or change voltages and so on.

What i would do if it was me is as follows.

Set vcore to something like 1.4v
Set northbridge/mch to 1.4v
Ram volts to 2.0/2.1v
Ratio to 1:1
Memory Timings to Auto.
Cpu Multi to 6

Now once all that is set, you can go about testing the FSB, by raising it from stock in increments, or alternativly just go straight in at 419 as u know it will boot up at that.

The reason the multi, ratio are set like that is so the limits of the cpu/memory are not hit, in the FSB testing. Same for having the vcore that high, its not needed but for short testing its perfectly fine, even on the cooler you have, trust me iv used the same cooler/cpu with far more volts.

May take some testing, and as previosly said, skip to 430 or so if need to see if there is a hole in the FSB, i doubt it but you never know.

And if you can't get over 419 with the above settings, then that will be you max FSB, and you would have to put up with it. But best to test.
 
Thanks for the advice, i'll give it a shot.

For the voltages should i just leave all the stuff like CPU PLL and CPU Termination and whatnot?
 
Yeh just leave them for now, those mainly need tweaking when using quads, they will aid in more stablization, but thats for later, we need to find your max bootable FSB first.

So deffinatly leave them alone for now.
 
Hello Goose :)

Goose said:
I was short on time
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I spent three years (Nov 2006-Nov 2009) learning how to overclock the LGA775 platform, spent ages tinkering with things, reading this, reading that etc . . . you need a certain amount of patience and you need to be prepared to put the hours in and follow instructions . . . I'm still waiting for you to confirm how fast you can get the memory memtest stable . . . once that is done then you will be ready for the next stage! ;)

Getting the best performance is about a blend of CPU/FSB/ & Memory MHz and you need to do isolated testing on each of these elements separately and not just wang everything all at once . . . voltages like vNB, CPU PLL and CPU Termination should be left on full [Auto] at this early stage . . . the only thing you should be changing is possibly vDimm and memory timings . . .

I'll check back in a day or two and see how your getting on . . . if you want the best results then a slower more methodical approach will work best for you and answer all your questions about why things don't run stable or won't let the PC boot etc etc . . . heres the E8400 result I got from plodding along, 4.25GHz, rock solid stable, DDR2-666 running at DDR-1200, NBcc running at 562.5Mhz . . . wicked fast system! :cool:

1350425ghz3.gif
 
I'm a little busy this week but i'll try and put in some time this weekend and figure out how fast i can my ram running at memtest stable.
 
Just a quick update. I thought i'd try and determine my maximum FSB as has been suggested already and my results we on par. I reduced the multi to 6 and it failed to post when put to 420x6. I'd reduced my memory multi to its lowest setting (2.00) so i'm guessing 419 is my absolute maximum FSB.

I'll still set about testing how high i get my ram going though, Wayne. I have this afternoon free so i'll give it a shot and when i'm out tonight i'll let Memtest86 loose for a good 4 or 5 hours.
 
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