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Now what am I doing wrong? E8400 - Page 2

post #11 of 21
Thread Starter 
I tried the memory at 800mhz and had the same problems when upping the FSB. The auto timings are way loose when on auto. I can set them manually at 5-4-4-12-2t and it stays stable at 3.6... Although I have not done any long term stability tests. Did a few runs on 3dmark06 and played crysis for about 2 hours last night. 1610 seems fine, 1615-1675 is no good. I didn't try higher.

So up the volts on the northbridge? What would 1:1 timing be on the ram cause when I set it linked 1:1 it tries to push the RAM at the same FSB at the cpu which is like 1400 mhz or something like that.
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post #12 of 21
Dont worry about 1:1. People are reffering to 1:1 with Intel chipsets. And even that is not true 1:1. They are referring to 1:1 with the FSB, which is the lowest divider the Intel chipset can run.

Remember, your FSB isnt actually 1400MHz, that is the QDR. Your actual FSB is 1400/4= 350. So 350 is your actual FSB. 1:1 with 350 is DDR2 700 speeds.
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post #13 of 21
Nvm
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post #14 of 21
It has to be your RAm or your CPU is just fried

My E8400 is stable at 4.2GHZ 24/7 with just 1.30 volts

1.36 is dangerous dude stop it before it gives up on you!
    
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post #15 of 21
Quote:
Originally Posted by XFreeRollerX View Post
It has to be your RAm or your CPU is just fried

My E8400 is stable at 4.2GHZ 24/7 with just 1.30 volts

1.36 is dangerous dude stop it before it gives up on you!

1.36v is not dangerous, it is Intels safe max vcore. But above 1.36v is bad.

If his ram is stable at 3.6GHz unlinked and sync'ed. then what does it matter? You know NVIDIA chipsets can OC the CPU independently of the ram, unlike Intel.


But we can test this theroey by having him set the ram to 800, and continue OCing the CPU. I am still almost certain it is a FSB Hole!

This info is in my 680i overclocking sticky.

I found that these boards have a "FSB Hole". What I mean by FSB hole is that at a certain FSB, no matter how much vcore I gave the CPU, it would not boot stable, or sometimes not at all. At 390+ FSB (up to 410) I could not boot with 1.55 vcore. But when I set FSB to 411 and up, I was able to boot and run OCCT for over 3 hrs stable. I eventually reached 1.4 vcore at 3.7GHz. I have also found that no two boards will necessarily have the same FSB Hole, and bios updates can even move them to different FSB frequencies.




Quote:
I discovered I had a FSB hole with my motherboard. I couldnt OC FSB from 395 - 408, but at 411 FSB I can run OCCT stable. Running 3.705GHz at 1.4v. My ambient right now is 26°C, my idle is 33/36° and load is 52/54°C.

Processor Model: E6600
CPU Clock Speed: 3705MHz
CPU Bus Speed: 411.67
CPU Multiplier Setting: x 9
CPU Core Model: Core 2 Duo
CPU week/stepping: L649G979
CPU Voltage: 1.4v (no vdroop)
Motherboard: EVGA 680i SLI A1
Memory: G.Skill CL4D6400-2GBPK 4-4-4-12 2T
Cooling: Swiftech Sys, Apogee GT & NB cooler

CPU: 1.425v
CPU FSB: 1.4v
RAM: 2.0v
SPP: 1.4v
MCP: Auto
MCP->SPP: Auto

SuperPI result (1M): 14.655s

CPU-Z Validation
-------------------------------------------------------------------------------------------------

This will help explain why there is a FSB Hole:

Duckieho posted this thread on the 680i strap which I will use to help illustrate the point. Basically what these are showing is that the northbridge chipset has latency much like your ram. When you move up in FSB, it will move to a different "strap" and loosen the timmings so to speak. The graphs show the "FSB hole" as well. Basically you take a huge hit in performance between 1376MHz up to 1454MHz, and above 480 FSB. I plan on running a 400 - 450 FSB.

Source: It-reviews.net
Quote:
Originally Posted by DuckieHo View Post
And burn posted this one:
Quote:
Originally Posted by Burn View Post
Wrong link, I edited it for the right one.

And here is a graph of relative performance. Note the difference between actual and what they expected, in this graph:

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post #16 of 21
Nvm
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post #17 of 21
Thread Starter 
Ok so I will bring the RAM down to 800mhz, then up the volts on the NB and FSB to 1.5v? I will lower the volts on the cpu, and try from there?

Also anyone have any idea what causing the cpu current volts value? I have the cpu set to 1.36 but the current volts displays as 1.32 even after reboot. Think thats because the 1.4 setting on the FSB and NB?

Oh and everybody +REP for helping.
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post #18 of 21
Quote:
Originally Posted by Eastspur View Post
Ok so I will bring the RAM down to 800mhz, then up the volts on the NB and FSB to 1.5v? I will lower the volts on the cpu, and try from there?

Also anyone have any idea what causing the cpu current volts value? I have the cpu set to 1.36 but the current volts displays as 1.32 even after reboot. Think thats because the 1.4 setting on the FSB and NB?

Oh and everybody +REP for helping.
Thats called v-droop, this is normal

this is good because now this means you are actully using 1.32 volts on your CPU....not 1.36...

Keep your volts there, if youre worried about CPU stability, Drop the multi to 6 or 7 and raise the FSB to match the current CPU speed.... then raise the multi


but test in between (test after lowering multi/raising FSB, and test after raising multi back up)
    
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post #19 of 21
Quote:
Originally Posted by jph1589 View Post
Eric, you missed the point completely. And you aren't the only person who understands nforce chipsets. Read my previous post again(or maybe for your first time).
I wasnt refering to your post at all. I just dont think the ram, running stable at DDR2 1000 at 3.6GHz with 400 FSB, will run unstable as you increase the FSB.

I dont know why you read any disdain in my post. So sorry if it came off that way.

But I have read every post...
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post #20 of 21
Eric's the man, I'd listen to him
    
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