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Overclocking my Q8400 on my GA-EP45T-USB3P - Page 2

post #11 of 32
I needed to bump MCH ref to get higher FSB out of my P45, but do a little at a time. Are you bumping your CPU multiple down to tune your board for the higher FSB? Sometimes it's worth doing so you don't have to guess if it's CPU or Mobo/RAM failure.

Have you tried with 2 sticks of RAM rather than 4, just to see?
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post #12 of 32
A q8300 isn't a very good overclocker and a 1.0 oc with it would be the most I would ever expect from it.If you can do 3.5 you have done very good.
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post #13 of 32
Quote:
Originally Posted by Gnomepatrol;12223184 
When upping your fsb you need to up your MCH core. Try not to go over 1.3v on it. Some people go to ~1.34 or so.

This is a situation where a little can go a long way. If i remember correctly i has my xeon running at a 500 FSB with a 1.3v MCH core.

Your chip has to be able to handle it as well.

g0004.jpg

You can give a small bump to MCH reference as well try to stay under 0.9v

I've tried messing around with that today... But it really hasn't made any difference at all, the max I can get booted into windows with is 420MHz. Honestly, I'm wondering if this is a memory thing, my memory is only rated to run at 1600MHz (400 on the bus) and right now I have it at 1680, but I've overvolted the RAM up to 1.8 (now it's back down) and that didn't get me anywhere. confused.gif

Anyway, here are pictures of my bios settings:
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post #14 of 32
Quote:
Originally Posted by 2thAche;12223534 
I needed to bump MCH ref to get higher FSB out of my P45, but do a little at a time. Are you bumping your CPU multiple down to tune your board for the higher FSB? Sometimes it's worth doing so you don't have to guess if it's CPU or Mobo/RAM failure.

Have you tried with 2 sticks of RAM rather than 4, just to see?

Well, my CPU multiplier has a range of 6-8... So very limited. I suppose I could try lowering it but that would mean having to up the FSB a lot more and that seems like the opposite of what I want to do.
I'm pretty convinced that it's not the extra 2 sticks of RAM because I only added them very recently and before that I had the exact same problem.
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post #15 of 32
Quote:
Originally Posted by btgrant;12225464 
Well, my CPU multiplier has a range of 6-8... So very limited. I suppose I could try lowering it but that would mean having to up the FSB a lot more and that seems like the opposite of what I want to do.
I'm pretty convinced that it's not the extra 2 sticks of RAM because I only added them very recently and before that I had the exact same problem.

That's the point, you need to know what your board is capable of, and what it needs to get there. Find the FSB max, what tweaks it may need for more, then you'll know where the CPU is failing vs where the board is failing.

I tried to OC a 9550 on my X48 board, and couldn't get more than 3.7. I bumped the multiple down, and found out the board couldn't do more than 435. I got a UD3P, and took that same chip to 4.3. Some boards are weak, just like some CPUs are weak, and now I always test the board before OC on the CPU.

If your board won't go further than 420 at 6x CPU multi, you know you have a mobo or RAM problem.
Edited by 2thAche - 2/1/11 at 12:00pm
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post #16 of 32
Thread Starter 
Ram usually isnt happy with lots of FSB...from my knowledge....any thoughts?
 
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post #17 of 32
Quote:
Originally Posted by txtrkandy;12225650 
Ram usually isnt happy with lots of FSB...from my knowledge....any thoughts?

Just have to drop the multiplier on the ram to keep it within rated specs as close as you can and provide slight voltage tweaking if need be.

Ram clocking, at least for myself, comes after you have a stable cpu clock.
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post #18 of 32
Fsb hole?
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post #19 of 32
Quote:
Originally Posted by Gnomepatrol;12225721 
Just have to drop the multiplier on the ram to keep it within rated specs as close as you can and provide slight voltage tweaking if need be.

Ram clocking, at least for myself, comes after you have a stable cpu clock.

How would I drop the multiplier on the RAM? Do you mean the timings or am I on a different page than you?
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post #20 of 32
Quote:
Originally Posted by 2thAche;12225565 
That's the point, you need to know what your board is capable of, and what it needs to get there. Find the FSB max, what tweaks it may need for more, then you'll know where the CPU is failing vs where the board is failing.

I tried to OC a 9550 on my X48 board, and couldn't get more than 3.7. I bumped the multiple down, and found out the board couldn't do more than 435. I got a UD3P, and took that same chip to 4.3. Some boards are weak, just like some CPUs are weak, and now I always test the board before OC on the CPU.

If your board won't go further than 420 at 6x CPU multi, you know you have a mobo or RAM problem.

That's a good point, I'll test that and post back when I do.
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