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1.5v DDR3 on P45 Chipset

post #1 of 12
Thread Starter 
I've gone and bought an 8GB Mushkin DDR3 1600MHz 9-9-9-24 kit [link] to use in my EP45T-USB3P.

Now, the existing RAM I have in there, the OCZ Oblivion has the same speed and timings but rated for 1.65V. The thing is, under no configuration can I get it stable with both sticks at 1600MHz. In fact, anything over 1200MHz fails to boot, no matter how much voltage I pump through it. (I went up to 1.7v before deciding to call it a day).

So I'm looking for advice on what to expect and how to get this Mushkin kit to 1600MHz. I've not put it in yet, but I'll probably end up doing that at some point tomorrow.

What sort of voltage will I need to go up to, and what is safe to go up to, in order to get to 1600MHz at 9-9-9-24?

Thanks.
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post #2 of 12
you should not have to over volt the ram if it's stock speed is 1600MHz
you might have to oc the mobo tho
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post #3 of 12
Have you overvolted the NB? I'd imagine you'll need to with 2x4GB @ 1600.
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post #4 of 12
Thread Starter 
Quote:
Originally Posted by 3dfxvoodoo View Post
you should not have to over volt the ram if it's stock speed is 1600MHz
you might have to oc the mobo tho
From what I've been told, the P45/C2Q combination has a weaker memory controller, hence it needs more voltage. But that said, looking at your sigrig, you've got the same RAM on the X48 so I'm guessing you're speaking from experience?

OC the mobo as in increase the FSB? I'm currently at 445FSB x9 multi for 4GHz clock speed. I once managed to get it to run Pi at 4.5GHz, but yesterday I couldn't even get 4.1GHz stable. :/




Quote:
Originally Posted by Darren9 View Post
Have you overvolted the NB? I'd imagine you'll need to with 2x4GB @ 1600.
The highest I can take the NB without active cooling on it is 1.4v, which I have done to no effect
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post #5 of 12
Quote:
Originally Posted by [Adz] View Post
From what I've been told, the P45/C2Q combination has a weaker memory controller, hence it needs more voltage. But that said, looking at your sigrig, you've got the same RAM on the X48 so I'm guessing you're speaking from experience?

OC the mobo as in increase the FSB? I'm currently at 445FSB x9 multi for 4GHz clock speed. I once managed to get it to run Pi at 4.5GHz, but yesterday I couldn't even get 4.1GHz stable. :/






The highest I can take the NB without active cooling on it is 1.4v, which I have done to no effect
I needed a small fan on the NB on my X48 to make the +0.25v to get stable at around 450FSB with 2x2GB 1600 ram, P45 may do it with less though.
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post #6 of 12
Thread Starter 
Quote:
Originally Posted by Darren9 View Post
I needed a small fan on the NB on my X48 to make the +0.25v to get stable at around 450FSB with 2x2GB 1600 ram, P45 may do it with less though.
Sorry what do you mean by the +0.25v there?
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post #7 of 12
Quote:
Originally Posted by [Adz] View Post
Sorry what do you mean by the +0.25v there?
he added .25volts to the mobo
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OoGhiJ MIQtxxXA
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by 3dfxvoodoo View Post
he added .25volts to the mobo
As in northbridge? To what total voltage (1.40v? 1.65v? )

Posted via Overclock.net Mobile RC3
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post #9 of 12
Quote:
Originally Posted by [Adz] View Post
As in northbridge? To what total voltage (1.40v? 1.65v? )

Posted via Overclock.net Mobile RC3
1.45v on the NB was the lowest and it shutdown without a fan.
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post #10 of 12
Thread Starter 
Quote:
Originally Posted by Darren9 View Post
1.45v on the NB was the lowest and it shutdown without a fan.
Correct me if I'm wrong, but the northbridge is under the heatsink with the Gigabyte logo right in the centre of the board, right next to the RAM slots, right?
Is there anything that monitors the temps of the NB, and how safe is it go above 1.4v?
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