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E8400 @ 3.9ghz @ 1.34v - is it safe?

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My mistake, actually that's as low as you can go with the ram. What are your timings set at? Also what performance level is the ram set at?
 
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My mistake, actually that's as low as you can go with the ram. What are your timings set at? Also what performance level is the ram set at?

My timings are @ 5-5-5-15... But I have to admit, I know nothing about RAM timings. I just used them because they seem to be what my RAM is rated at, because when I set memory timings to manual, it presented me with 5-5-5-15, and I decided not to mess with it. But tell me, would 4-4-4-12 mean "faster" memory? I'm trying to now: the lower the timing numbers, the better (performance-wise)?

RAM performance level? Please elaborate, i'm kind slow today :D

And yes, you are right, the lowest i can set the RAM to is FSB x 2; except when running stock FSB @ 333mhz, u can actually set it to 800mhz instead of 667mhz.
 
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We are trying to get your system stable not necessarily improve performance yet. Try setting the timings to 5 5-5-18 and test for stability.
 
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We are trying to get your system stable not necessarily improve performance yet. Try setting the timings to 5 5-5-18 and test for stability.

Will do. Be right back; Gonna mess with RAM timings.
 

EastCoasthandle

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Hey there!

I finally decided to OC my e8400, i'm still taking baby steps in OCing, but i think i'm getting the hang of it.

Right now I have it @ 1,36v in BIOS, 1.34v in CPU-Z.

Northbridge is @ 1.34v in BIOS

My temps are, according to HWmonitor: 38-40C @ idle; ~65C @ load on a Zalman CNPS7500.

I thinking of going a bit further, but I have to upgrade my RAM to DDR2 1066mhz, as my 800mhz Kingston craps out if I try to go for 4ghz+.

But for now, do you think I'm good? Temps and voltages, are they within safe limits? This a 24/7 OC, so if there's smoething i'm doing wrong, please tell me.

Do you mind posting a screen shot showing this? I like to see what CPU-z is reading. Thanks :toast: (I wish we had a thumbs up icon).

Edit:
This is what I am seeing so far at 3.60Ghz (bios at 1.3000V)
 
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Do you mind posting a screen shot showing this? I like to see what CPU-z is reading. Thanks :toast: (I wish we had a thumbs up icon).

Sure, let me just upload the pics. :)

Here it is:



The only difference now is the CPU voltage, I actually decreased it a bit in the BIOS: now @ 1.33v in BIOS; 1.31v in CPU-Z.

With HWmonitor u can also see the whole package, including idle temps.

I will now test with prime95 with RAM timings @ 5-5-5-18, like erocker sugested.
 
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Damn. Still a no go. with ram timings @ 5 5 5 18, it still rebooted as soon as I started the Prime95 blend test.

I dont get this...

my current volts in BIOS

NB - 1.4v

CPU PLL - 1.56

FSB termination volt - 1.32

RAM - 2.02v
 

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Hmm, you may want to go into your bios and enable speedstep. No need to be idling at 1.31V when you doing "desktop stuff". Once you do post another pic. Only when you found the CPU voltage stable.

Damn. Still a no go. with ram timings @ 5 5 5 18, it still rebooted as soon as I started the Prime95 blend test.
That's because 1.33V vcpu is too low.
 
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Hmm, you may want to go into your bios and enable speedstep. No need to be idling at 1.31V when you doing "desktop stuff". Once you do post another pic. Only when you found the CPU voltage stable.


That's because 1.33V vcpu is too low.

Is it a good idea to turn speedstep on when OCing? Also, you suggest I increase my vcpu a bit? It's @ 1.33 in BIOS, what do you suggest changing it to?
 
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Ok, I just turned speedstep on, and when idling, the clock goes down, but the voltage stays the same when idling and on load??! What do I have to do for the voltage to decrease when the CPU clock comes down from idling?

Isn't the voltage supposed to drop when CPU idles? Or does the fixed value you set in the BIOS (in this case, 1.35v in BIOS right now - 1.33v in CPU-Z) never float regardless of CPU workload? It's supposed to drop even when OCing isn't it?
 
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You should be able to adjust your memory MHz separate from your FSB. You need to run the memory and fsb unlinked.
 

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Is it a good idea to turn speedstep on when OCing? Also, you suggest I increase my vcpu a bit? It's @ 1.33 in BIOS, what do you suggest changing it to?
Yes, it is as it downclocks your cpu until the extra power is needed. As far as voltage goes, bring it back up to what you had it in your OP. Then go down 1 increment at a time.
 

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Ok, I just turned speedstep on, and when idling, the clock goes down, but the voltage stays the same when idling and on load??! What do I have to do for the voltage to decrease when the CPU clock comes down from idling?

Isn't the voltage supposed to drop when CPU idles? Or does the fixed value you set in the BIOS (in this case, 1.35v in BIOS right now - 1.33v in CPU-Z) never float regardless of CPU workload? It's supposed to drop even when OCing isn't it?

Hmm, you may need to update your bios. However, don't just do it "blindingly". Check the description for any updated bios and see if there is a newer version that address this. Keep in mind there are few versions of speedstep out there. Also, I am not sure if you need to enable any thing else in your bios so check the manual. :toast:


Sidenote:
IMO, you should just OC your CPU to 3.60GHz which is very doable at or around 1.3000V. Anything higher may require a bit more attention to ambient temps overall heat and power consumption.
 
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Hmm, you may need to update your bios. However, don't just do it "blindingly". Check the description for any updated bios and see if there is a newer version that address this. Keep in mind there are few versions of speedstep out there. Also, I am not sure if you need to enable any thing else in your bios so check the manual. :toast:


Sidenote:
IMO, you should just OC your CPU to 3.60GHz which is very doable at or around 1.3000V. Anything higher may require a bit more attention to ambient temps overall heat and power consumption.

According to ASUS Update, I have the latest version: v2002 (02/23/2009)

The CPU Vcore just stays the same, whether it's idling or full load. :( Is this a bug? I've seen screenshots of OCs that show that the voltage actually lowers when CPU is idling, even when OC'ed
 
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voltage IS supposed to go down I think... dunno for sure though...

Try raising your vcore for more stability
 
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Might be your ram though - you have ddr2 800 ram.

Try running prime at 8 x 434 to see if your ram is even stable at 434.

And remember to keep your ram 1:1 (667) while testing.

EIST always off (c1e ok) while testing overclock limits - once you hit your ceiling then you can back down a bit and turn it on.
 
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According to ASUS Update, I have the latest version: v2002 (02/23/2009)

The CPU Vcore just stays the same, whether it's idling or full load. :( Is this a bug? I've seen screenshots of OCs that show that the voltage actually lowers when CPU is idling, even when OC'ed

I can't say what's going on with your motherboard. Checkout their forums and see if there are others with this concern.
 
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Might be your ram though - you have ddr2 800 ram.

Try running prime at 8 x 434 to see if your ram is even stable at 434.

And remember to keep your ram 1:1 (667) while testing.

EIST always off (c1e ok) while testing overclock limits - once you hit your ceiling then you can back down a bit and turn it on.

I never thought of that! Thanks, It's a good way to check if the RAM the culprit of all this trouble.

I can't keep the RAM @ 667mhz. It goes up with the FSB. I have the FSB @ 434mhz right now, so that means that RAM is @ 870mhz (434x2)
 
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SITUATION UPDATE

First of all, I want to thank everyone's input. In one way or another, it has been a good learning experience. So thank you! :toast:

Well, I decided to say "screw it" and went to the BIOS and pushed the FSB to 445mhz, up from the previous 434mhz.

My CPU now sits @ 4.0ghz.

[BIOS Settings:

CPU vcore: 1.3835v (1.368v CPU-Z)

CPU PLL: 1.56v

FSB termination or VTT: 1.52v (is this ok? or is it too much?)

CPU GTL reference: 0.63x (I still have no idea what this does)

NB: 1.40v

What do you guys think of this? Acceptable Voltages? Too much? Do I risk frying it?

Surprinsingly, the system seems more stable now @ 4ghz... It can now run Prime95 Blend test for +/- 10 minutes, whereas @ 3.9ghz @ 1.34v it would crash and reboot instantly.

I included a screenshot of my system running Prime95 Blend Test from a few minutes ago, before it crashed.

Included are: Load temps, CPU-Z voltage, and some other (meaningless?) numbers. BTW, RAM is @ 445x2 (890mhz) with 5-5-5-18 timings. Not 100% stable, but lets work from here.



Further input would be great!
 

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SITUATION UPDATE

First of all, I want to thank everyone's input. In one way or another, it has been a good learning experience. So thank you! :toast:

Well, I decided to say "screw it" and went to the BIOS and pushed the FSB to 445mhz, up from the previous 434mhz.

My CPU now sits @ 4.0ghz.

[BIOS Settings:

CPU vcore: 1.3835v (1.368v CPU-Z)

CPU PLL: 1.56v

FSB termination or VTT: 1.52v (is this ok? or is it too much?)

CPU GTL reference: 0.63x (I still have no idea what this does)

NB: 1.40v

What do you guys think of this? Acceptable Voltages? Too much? Do I risk frying it?

Surprinsingly, the system seems more stable now @ 4ghz... It can now run Prime95 Blend test for +/- 10 minutes, whereas @ 3.9ghz @ 1.34v it would crash and reboot instantly.

I included a screenshot of my system running Prime95 Blend Test from a few minutes ago, before it crashed.

Included are: Load temps, CPU-Z voltage, and some other (meaningless?) numbers. BTW, RAM is @ 445x2 (890mhz) with 5-5-5-18 timings. Not 100% stable, but lets work from here.

[url]http://img257.imageshack.us/img257/6826/myoc.th.jpg[/URL]

Further input would be great!
This makes sense to the pattern I've seen so far:
3.60GHz
4.00GHz
4.20GHz
which seem to work best with that CPU. Odd OCs at 3.7GHz, 3.8GHz, etc are not common.
So in the end as long as:
-you temps are low
-you vcore is within tolerance according to Intel (Max can be found on Page 17-18)
-your gaming and other programs are stable
you are fine in my book

Explanation of VID Range can be found here
 
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This makes sense to the pattern I've seen so far:
3.60GHz
4.00GHz
4.20GHz
which seem to work best with that CPU. Odd OCs at 3.7GHz, 3.8GHz, etc are not common.
So in the end as long as:
-you temps are low
-you vcore is within tolerance according to Intel (Max can be found on Page 17)
-your gaming and other programs are stable
you are fine in my book

Just one question though, the CPU datasheet you just linked states that max FSB termination volt should be 1.45v... I have mine @ 1.52 :ohwell: Am I pushing my luck here?
 
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I know this wasnt directed toward me but I'd try slightly reducing it and seeing what happens but listen to eastcoast before me
 

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Just one question though, the CPU datasheet you just linked states that max FSB termination volt should be 1.45v... I have mine @ 1.52 :ohwell: Am I pushing my luck here?

In my honest opinion, YES! (I believe you meant core voltage and not FSB voltage)
Someone help me here but I believe you need to go by the VID of your CPU as each CPU doesn't guarantee 1.45V.
Look at my other post as I've updated it with another link and included page 18.
 
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Holy shit, Intel states max FSB termination voltage @ 1.15v!! Shit, I'll be right back. No OC is worth frying a CPU over.

I'll lower FSB term voltage, if it becomes unstable @ 4ghz, well, I just push it back to 3.6ghz and give up on this 4ghz thing :(
 

EastCoasthandle

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Holy shit, Intel states max FSB termination voltage @ 1.15v!! Shit, I'll be right back. No OC is worth frying a CPU over.

I'll lower FSB term voltage, if it becomes unstable @ 4ghz, well, I just push it back to 3.6ghz and give up on this 4ghz thing :(

:confused:
Page 17-18 talk about core voltage & VID...
 
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