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Cannot change FSB frequency on Asus P5K-SE

post #1 of 14
Thread Starter 
Hello,

I have the Intel E8200 CPU running on an Asus P5K-SE mobo.

When I go into the BIOS I cannot change the FSB frequency. It is fixed to 333MHz. When I select/highlight it and I press "Enter" nothing happens.

Has anyone ever had this problem ?

Thanks in advance.
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DarkAngel
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post #2 of 14
this is because you must directly type in the frequency you want

just use the number keys located at the top of your keyboard and type, say, 400 or whatever frequency you desire...
    
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post #3 of 14
Thread Starter 
Ok. I changed the frequency to 400MHz and the RAM frequency was automatically set to 800MHz.
The system booted and I saw the windows "Loading..." screen the the monitor went blank and apparently the mouse's light turned off.
What's going on ? I heard/read reviews saying this board can easily do 450MHz on the FSB.

Edit: I set the PCI Frequency to a fixed 100MHz and it's working now. I'm running at FSB 400MHz. So I think the problem is solved.

Wow, I just reached FSB 450MHz and the CPU is running at 3.6GHz without any modifications to VCore !
Ok I ran Prime95 and it immediately stopped saying "Hardware Failure - Execution Halted - Check the file stress.txt"
Does that mean I have to up VCore ?
What is the maximum safe VCore for air cooling (I have Thermaltake Silent Tower) ?
What is the maximum safe temp for the Intel E8200 CPU ?
What is the maximum safe Northbridge temp for my mobo ?

Sorry for asking all those questions.
Edited by Tera - 6/28/08 at 12:06pm
DarkAngel
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DarkAngel
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post #4 of 14
for an E8200, a 45nm proc, MAX voltage before the chip starts degrading is 1.36. As for safe temps, I believe that LOAD temps should not be much higher higher than ~60c.

In all honesty, I have no idea what safe NB temps might be, I don't even know how to monitor them.

Yes I would up the VCore, but congrats on the overclock so far, and welcome to OCN.
    
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post #5 of 14
Thread Starter 
Thanks for the welcome.

I'm curious about the max vcore being 1.36 though because I read in this article where it says a vcore of 1.5V is safe for a 24/7 overclocked machine.

Quote:
Actually, our tests showed that Wolfdale responds very good to Vcore increase. But we didn’t aim for record-breaking speeds, so we only increased the processor Vcore in the BIOS Setup to 1.5V that resulted into the actual 1.42-1.46V taking into account Vdroop. This voltage increase is relatively harmless for a processor using an efficient air cooler and is acceptable for systems running 24/7.
What about the max safe temp ? Intel's website says it's 72.4C
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DarkAngel
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post #6 of 14
Quote:
Originally Posted by Tera View Post
Thanks for the welcome.

I'm curious about the max vcore being 1.36 though because I read in this article where it says a vcore of 1.5V is safe for a 24/7 overclocked machine.



What about the max safe temp ? Intel's website says it's 72.4C
That's for a 65nm proc, yours is 45nm, correct?

Yes, you can get up to that 72C, but it won't be healthy for your chip.
    
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post #7 of 14
FSB 450 means you are running the memory at 900mhz. Are you sure that set of Kingston can handle it? You might need to up the V-dimm voltage.
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post #8 of 14
Alright where so I start, on these cpus, keep vtt (fsb termination) at or below 1.36 as there are no benefits of going higher and going higher will kill the cpu fast(1.5+). Vcore, stay below 1.36 or if you want, 1.4 is the max I would run 24/7. Google and download cpuz and real temp to monitor voltages and temperatures. As far as temps go, try to stay below 65c real temp. There will be vdrop so when you set 1.4 in bios, the voltage in windows will something like 1.35v, but each board is different for this. As you have found out, lock pci-e to 100 and for memory, stay away from anything 2.2v and above, unless you have active cooling on the ram. Try to set all voltages manually and leave little to "auto", auto set voltages will be much higher than they need to be. Northbridge voltage for that cpu is probably going to be fairly low, like 1.5 max. Temps on the NB should stay below 50c, and if they get bad, take off the stock cooler and clean the paste off and redo it with AS5, that will drop it 5c or so. After you get 450 stable, try for 475 and increase vcore and nb voltage to gain stability, lock pll to the lowest it can go which should be enough.
    
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post #9 of 14
Use the + key to increase, - to decrease. I've seen this bug on different versions of my BIOS (and Rampage Formula)

EDIT:
nevermind you figured it out.
Keep in mind that those 45nm CPUs can't take as much VCore as the 65nm process. The rules are all on Intel's thermal and electrical data sheets

Here is the specific document. Go to page 18 for the absolute max voltages. It's 1.3625V for the Vcore. They have others listed such as FSB termination voltage, etc.
Edited by binormalkilla - 6/28/08 at 1:54pm
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post #10 of 14
you ussaully have to set overclocking to manaul and the max vcore is ~1.35
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