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VRM on the new AM4 motherboards - Page 150

post #1491 of 1994
Quote:
Originally Posted by bardacuda View Post

Well I'm not worried about it personally. As others have pointed out it's just a copper coil with a ferrous core in a ceramic case. I wouldn't be surprised if they're good for several hundred °C. It's just heat bleeding into the surrounding circuitry that could be a problem.

That's what I'm worrying for. It limits the board's potential. A pity, considering that they did the rest right.

Edit:
Quote:
Originally Posted by virpz View Post

Page eleven will paint a fast picture
http://www.ti.com/lit/ds/symlink/csd87350q5d.pdf

Looking at the spec-sheet for a while now and still can't figure out how you reached that conclusion.
Edited by PsyM4n - 5/4/17 at 1:50pm
post #1492 of 1994
I didn't measure any amps or wattages, just temps. So I don't know how you could conclude anything on efficiency either.
post #1493 of 1994

If you use the reference application model components you can be pretty certain about the efficiency by looking at the manufacturer data.

 

They have a very nice chart for that, as he says, on page eleven.

   
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post #1494 of 1994
20 min OCCT default settings @ 4.1 ghz 1.45 - 1.46 volts CPU VRM max 44 C, - ambient 19 C, 2- 120 mm fans providing airflow to the entire heatsink area ,cpu and soc, - no fan on back side of board.

Temps had maxxed out and were dropping off intermittently - so I stopped the test.






After a minute of cool down
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post #1495 of 1994
Quote:
Originally Posted by bardacuda View Post

I didn't measure any amps or wattages, just temps. So I don't know how you could conclude anything on efficiency either.


Assuming that you have the processors at 1.4V and requing X current at full load you can draw a line and get an approximation based on the csd87350q5d datasheet
post #1496 of 1994
Quote:
Originally Posted by PsyM4n View Post

Looking at the spec-sheet for a while now and still can't figure out how you reached that conclusion.
A few pages back you wer talking crap non stop about that exact same subject now you can't figure it out. doh.gif
post #1497 of 1994
Quote:
Originally Posted by virpz View Post

A few pages back you wer talking crap non stop about that exact same subject now you can't figure it out. doh.gif

Well, I still can't. I'd appreciate it if you would enlighten me.
post #1498 of 1994
Quote:
Originally Posted by PsyM4n View Post

Well, I still can't. I'd appreciate it if you would enlighten me.

Me ?

If you want to learn something, you can have a good start by saying sorry to the few people that tried to en-light you before. Most of them are more knowledgeable than I on that subject but they also seem to have the patience I lack.
post #1499 of 1994
OK, can someone tell me how he reached that conclusion? No matter how I think of it my rough estimation is about 90% efficiency at best.

Does not compute.
post #1500 of 1994
Does it really matter? The VRMs are not a problem on this board. Like you say if anything is a problem it's the chokes.
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