Overclock.net banner

1 - 12 of 12 Posts

·
Registered
Joined
·
1,417 Posts
Discussion Starter #1
Shall I increase the FSB voltage to get higher with E8400. My FSB is currently 445.

CPU voltage: 1.30V
DRAM voltage: 1.90V
NB voltage: 1.20V
Other voltage -settings are on auto.

What do you think?

Intel E8400 + P5Q Pro.
 

·
Registered
Joined
·
1,417 Posts
Discussion Starter #3
Quote:


Originally Posted by conductor609
View Post

I usually hear 1.35v as the maximum you should go on e8400's

I know, but when I tried to get higher, my voltage was 1.25V for the CPU, I could already do better clocks with the 1.30V, for sure.

And I'm not sure that would my temperatures allow the 1.35V for CPU.
 

·
Registered
Joined
·
1,417 Posts
Discussion Starter #5
Quote:

Originally Posted by ImmortalKenny View Post
1.3625v (IIRC) is the max you should go on the CPU for 24/7 use. However, you can go much higher for suicide runs.

I still don't get what you're exactly asking though.
I'm just wondering that shall I increase the FSB voltage, does it heat the CPU?
 

·
Premium Member
Joined
·
8,612 Posts
i used an EVGA 680i and got my E8400 C0 to 500 x 8 x 1.360v....i was using default voltages on 4 x 2GB OCZ SLI ram......
 

·
Premium Member
Joined
·
17,407 Posts
The default voltage for the P45 chipset is 1.10v NB with a 400 FSB. You are already running 1.20v NB with a 445 FSB. So I wouldnt expect you will need any more then you have already given it. It wont hurt anything to try 1.26v NB (I would keep it under 1.30v unless you are going for much higher FSB). What I would recommend you do for testing purposes is drop the multi to x8 and see if it runs stable with the FSB at 445 and the NB voltage at 1.20v. If it does, you can be certain the CPU itself needs more vcore with the x9 multi to be stable at 4.0GHz.
 

·
Registered
Joined
·
1,417 Posts
Discussion Starter #10
How about the DRAM voltage?

What do you think about this:

FSB: 445
Multiplier: x 9
CPU voltage: 1.30V
DRAM voltage: 1.90V @ 850MHz (5-5-5-10-2T)
NB voltage: 1.20V

Shall I go higher?
 

·
Premium Member
Joined
·
6,774 Posts
That A-Data ram is rated at 1.8v, and should be just fine at 1.9 for 850MHz and default timings.

The FSB VTT voltage affects the cpu as well on 45nm cpu's, and many suggest 1.3625 for a max on either. I have read the data sheets as it being a bit higher, but unless you are having a problem I would stay at 1.36 and below.

if you are stable at 445x9 I would just stay there, thats a nice OC and good voltage. If you are unstable just bump the vcore up a bit and try and stablize it.

CPU usually have a spot where it needs a big voltage bump to get to higher OC. Some will be rock stable at say 1.25v and 3.8, but need 1.35 to reach 4.0....
 

·
Premium Member
Joined
·
17,407 Posts
People tend to overvolt on VTT. All VTT does is cleans up the signaling between the CPU and the NB. The voltage adjustment is used to clean up the signaling. But adding too much voltage can also distort the signaling. For a 4.0GHz OC with a Q9650, I run 1.20v VTT, and for 4.2GHz OC, I tend to bump it to 1.24v. So really anything over 1.26v is overvolting from my own personal experience (using an X38, X48 and P45 chipset).
 
1 - 12 of 12 Posts
Top