Safe C2D voltage while watercooling?

C

Calefaction

Limp Gawd
Joined
Sep 1, 2004
Messages
335
Okay, I figured out my issue with getting over 400fsb was a voltage one. I brought my CPU up to 1.5v and I have gotten it quite a bit past 400. Now the question is: What voltage is safe on water? My under load temps are sitting at 51-53c per core. Is that decent? Can I safely up it another .5 or so?
 
what is your loop?

its safe to V-mod your CPU as far as you want* so long as you can control the temps. the temperature put out is a direct coralation to how much power you pump in to the CPU. if you raise the voltage, the total joules in to the CPU is upped, and more joules of heat are released. i put the star beside that staement because the more you V-mod the less your CPU lifespan is. Its something known as "electronmigration" and it occurs no matter what your voltage is, stock or otherwise. but once you start V-modding, your gonna get less and less FSB speed out of each voltage bump.
 
I am doing 420fsb at 1.5v, 53C under full load...does that seem like it's within safe ranges?
 
1.55v should be safe, but don't go any higher than that. For 24/7 operation, 1.5v should be your maximum.
 
Zero82z said:
1.55v should be safe, but don't go any higher than that. For 24/7 operation, 1.5v should be your maximum.
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This is on my gaming rig, so you are looking at 8+ hours a day. I will stick to 1.5v then.
 
I have it stable at 420 x 8, 3360mhz 1.5v, RAM is running 1:1 ratio, 4-4-4-12. I am satisfied, no reason to push it and cause hardware damage.
 
You should be able to go higher with less voltage. If not, your CPU is the limit and you will not gain anything by adding voltage anyway. I suggest you try lowering it to 1.4-1.45v and see if it's still stable, since that'll lower your temps.
 
Zero82z said:
You should be able to go higher with less voltage. If not, your CPU is the limit and you will not gain anything by adding voltage anyway. I suggest you try lowering it to 1.4-1.45v and see if it's still stable, since that'll lower your temps.
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It won't even boot at this FSB and those voltages. It won't post, I have to put it to 1.5v to make it post.
 
I got it to boot stable at 1.48125 in the bios...CPU-Z is reporting that's actually 1.44. Is this a 680i issue? Where it undervolts the CPU? CPU-Z and SpeedFan have always reported lower voltages than what I set in the bios.
 
It's called vDroop, it's typical of all motherboards. I'm not sure exactly why it happens. Anyway, as long as it's stable you should be fine with the settings as they are.
 
Zero82z said:
It's called vDroop, it's typical of all motherboards. I'm not sure exactly why it happens. Anyway, as long as it's stable you should be fine with the settings as they are.
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could also be a craptacular PSU, which would explain alot.

what is your water cooling loop?
 
It's a Koolance dual-radiator setup. I want to say the total heat dissipation is 300w? That's the figure I remember reading somewhere. It's 10mm tubing. The only thing in the loop is my CPU.

I may need a new PSU. This one is about eight months old. When I bought it, it was on the recommended PSU list, but my machine as it stands draws a lot more power now than it did then. I am looking in to getting a 700+W one, but it's tough to find a real quality one that will fit in my case. If it's too deep, it will bump in to the top radiator of my case.
 
Calefaction said:
I have it stable at 420 x 8, 3360mhz 1.5v, RAM is running 1:1 ratio, 4-4-4-12. I am satisfied, no reason to push it and cause hardware damage.
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what cpu are you using? for core2D's (with the exception of the extreme editions) you *generaly* want to use the highest (default) multiplier. 420x8 is the same as 373 x 9. if you want to get more out of your ram, dont drop the multi you change the fsb ratio. if your using a 6600 you will get the max settings with x9 and 1:1 divider then up the FSB until it stops. for 6400s you want to increase the fsb:cpu ratio to squeeze some more out of the ram after you maxed out the cpu. with these chips you get a higher % overclock from the CPU as opposed to the ram, so this is where you want to try to max out first.
 
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