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Question about VRMs (I have read the sticky ;)) - Page 2

post #11 of 26
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Quote:
Originally Posted by Blameless View Post

No x86 CPU is going to pull 400A, not without some insane OC on sub ambient cooling. Not even a maxed out 8150.
400W at 1.5v is 267A, and even that is not likely to be reached, because utterly no air cooler, and high end water could even move 400w of heat off the CPU.
As for useful numbers, I think the datasheets will be close enough for a ballpark figure. You just need to look at the temperature chart and have an idea of the max VRM temp you are going to see.
I would expect the Gigabyte 990FXA-UD3 to handle any OC you could keep stable on air, or most water.
No.

Thanks you just found the big mistake I was making... for some STUPID reason I was multiplying watts by amps instead of dividing... it's like a typo, only with math

Thanks this was the post I was hoping for.

That being said, 267A is still quite close to what the theoretical max supply of this VRM, and it is lacking compared to some other boards. I'll have to compare it to other $150 boards to get a better idea.. the Crosshair V was just a 'high end example' I was using
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post #12 of 26
One thing is that the mosfets are pulsed and can sustain large amounts of current for small amounts of time.
Lets take the PH5030 for example
at 25C sustained current can be 90A
at 100C sustained current can be 64A
At 25C and a pulse =< 10us it can handle 330A

This is another good article.

I haven't had any classes on VRMs yet but i am sure i could ask my professor more about there operation.
Edited by rancor - 3/31/12 at 11:41pm
post #13 of 26
Quote:
Originally Posted by Blameless View Post

400W at 1.5v is 267A, and even that is not likely to be reached, because utterly no air cooler, only high end water or sub-ambient cooling, could even move 400w of heat off the CPU while keeping it at usable temps.
.

Oh please, There are plenty of people around that run their CPUs on 1.5 volts and only use Air Cooling. I do it no probs.
post #14 of 26
Quote:
Originally Posted by madengineer View Post

Oh please, There are plenty of people around that run their CPUs on 1.5 volts and only use Air Cooling. I do it no probs.

He is saying you wont use 400W at 1.5 volts on normal cooling not that it is not possible to run 1.5V.
post #15 of 26
Indeed rancor, that's what I'm saying.
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post #16 of 26
Quote:
Originally Posted by spuppy View Post

Thanks you just found the big mistake I was making... for some STUPID reason I was multiplying watts by amps instead of dividing... it's like a typo, only with math
Thanks this was the post I was hoping for.
That being said, 267A is still quite close to what the theoretical max supply of this VRM, and it is lacking compared to some other boards. I'll have to compare it to other $150 boards to get a better idea.. the Crosshair V was just a 'high end example' I was using

this is what happens when people try to do math at night...

and what happens when reflex is too lazy to check math on weekends
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post #17 of 26
Quote:
Originally Posted by rancor View Post

He is saying you wont use 400W at 1.5 volts on normal cooling not that it is not possible to run 1.5V.

No, he was saying an Air Cooler couldnt remove the heat off a CPU that is using 1.5 volts.
post #18 of 26
Quote:
Originally Posted by madengineer View Post

No, he was saying an Air Cooler couldnt remove the heat off a CPU that is using 1.5 volts.

Go back and read my post again; that's not remotely what I said, and I just said that wasn't what I said when I told rancor that he got my meaning.

I thought I was pretty clear in my first post, but I was willing to give you the benefit of the doubt and assume I was not clear enough. Now you are explicitly saying something I explicitly clarified myself as not saying. Please don't put words in my mouth.

Voltage, in and of itself, says nothing about the amount of heat that needs to be dissipated. Total power does. Power, measured in watts, is voltage times amperage. No air cooler on the market can move 400w of heat, which at 1.5v would require the CPU draw 267A of current, while maintaining a usable temp delta. The FX-8150 has a pretty horrible power curve, but by no means will it draw 267A at any clock speed one is likely to reach without sub-ambient cooling.
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post #19 of 26
Thread Starter 
Yup these power draws I am reporting are with the AMD liquid cooler (the big noisy 2 fan one)
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post #20 of 26
Quote:
Originally Posted by spuppy View Post

Yup these power draws I am reporting are with the AMD liquid cooler (the big noisy 2 fan one)

That's a 120 rad right? I doubt such a cooler would be any better than high-end air.

I also have trouble believing the CPU itself could draw 400w. If you are measuring at the wall, you have to take PSU efficiency into account, which will knock off 15-20%. 300w or maybe, if the OC is high enough, ~350, is plausible, but 400w actually being delivered to the CPU itself and the CPU staying cool enough on that is not.
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