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VRM on the new AM4 motherboards - Page 151

post #1501 of 2036
Quote:
Originally Posted by virpz View Post

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

Are you figuring at 55 C operating temp?
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post #1502 of 2036
It's about 90% once you adjust for output voltage for mosfets only (not including choke/capacitors / board).

Adjusting for 1.4V results in less efficiency compared to 1.3V , the normalization factor is 1.025 x or so.


http://www.ti.com/product/CSD87350Q5D/datasheet/application-and-implementation#SLPS2885157
Quote:
Originally Posted by cssorkinman View Post

Are you figuring at 55 C operating temp?
temp is irrelevant unless 100°C+
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post #1503 of 2036
Quote:
Originally Posted by bardacuda View Post

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.

There's more to that, and the chokes are mostly to blame.
post #1504 of 2036
barracuda drop switching frequency to lowest setting. the cpu clocks better anyway, less stress on board.....it may even be defaulted there tbh.
post #1505 of 2036
What's the downside? I think the CPU clock limit might be related to droop. If SVI 2 is my drooped voltage then I'm losing like 75mV. I'm hoping a new BIOS fixes it. I've already tried LLC 2 and 3 and they're unstable.
post #1506 of 2036
Quote:
Originally Posted by AlphaC View Post

It's about 90% once you adjust for output voltage for mosfets only (not including choke/capacitors / board).

Adjusting for 1.4V results in less efficiency compared to 1.3V , the normalization factor is 1.025 x or so.


http://www.ti.com/product/CSD87350Q5D/datasheet/application-and-implementation#SLPS2885157
Quote:
Originally Posted by cssorkinman View Post

Are you figuring at 55 C operating temp?
temp is irrelevant unless 100°C+

25 amps 1 volt = 25 watts - 4.23 calculated lost = 20.77 = 83 % Where did I go wrong?
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post #1507 of 2036
Quote:
Originally Posted by bardacuda View Post

What's the downside?

In your case, it doesn't matter. xD
post #1508 of 2036
Quote:
Originally Posted by bardacuda View Post

What's the downside? I think the CPU clock limit might be related to droop. If SVI 2 is my drooped voltage then I'm losing like 75mV. I'm hoping a new BIOS fixes it. I've already tried LLC 2 and 3 and they're unstable.

I run lvl 5 vcore lvl 3 soc optimized phase on both. t.balanced on that board. Tbh i used same settings on all my Asus boards for daily use. 5 years strong on a 2600k with aggressive oc...no degrading not even after benching it on ln2...

No downside to lower switching frequency.

Also ODT 53.3 setting may help.

Not sure if your trying 3200 ram but imo that board can not handle it.

Run 2933 until they release a bios that I think is legit 3200 stable.

I have not pinned down the why...frustrating to say the least.
Edited by chew* - 5/4/17 at 3:28pm
post #1509 of 2036
I've already been able to run 2666 but I can't boot to it. I either need to set it at stock and then do the OCing after booting with Ryzen Master or something, or I need a new bios with VDDR Boot Voltage. I'm basically just wating for a new BIOS before I do any more tinkering. Hoping to get access to sub timings too. I don't need the MHz for anything right now.
post #1510 of 2036
Quote:
Originally Posted by bardacuda View Post

I've already been able to run 2666 but I can't boot to it. I either need to set it at stock and then do the OCing after booting with Ryzen Master or something, or I need a new bios with VDDR Boot Voltage. I'm basically just wating for a new BIOS before I do any more tinkering. Hoping to get access to sub timings too. I don't need the MHz for anything right now.

What memory do you have? Link me if you don't mind.
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