On 8/12/2021 at 3:06 PM, SteveW said:

Badly worded for an expert

no comprendo.

the interesting thing I have never observed in flight simulation before is that a software upgrade (SU5 + hotfix 2) all of a sudden results in PSU black outs, which in a way is a good thing because the hardware (GPU + 8 core CPU) is finally used to the max, and that is what we paid for in the first place. additional performance (frames per second) comes at a price, a 650 watts power supply + RTX 3090 obviously was just enough until SU5 came along. therefore I suggest anybody who is shopping for a PSU upgrade to go for 1.000 watts minimum, since the next generation of GPUs (RTX 4090) plus Alder Lake CPU will increase power budgets yet again. GPUs will draw up to 500 watts, even though the silicon structures will go down considerably:

https://www.avsim.com/forums/topic/604278-get-ready-for-a-massive-psu-upgrade/

 

 

On 8/13/2021 at 8:54 PM, turbomax said:

say captain say what?

increased resistance would lead to a drop in current, but no way to "deliver too much power", I have never heard of any power supply that delivers too much power 😊 There is no such thing as "too much power". the components will only draw whatever they need.

 

Unfortunately I was too busy to explain my post at the weekend where I said that contact resistance can be a problem, so I said that it was badly worded for expert review, simply because I had not provided enough information pertaining to my comments. I will expand on what I meant here:

As we know I (Current) = V (Potential Difference, Volts) divided by R (Resistance)  I = V / R. So with a given Voltage across a Resistor, as we increase Resistance the Current will decrease. And with P (Power, Watts) = I x V.

So with a poor power connection or resistive connection, the current will decrease. Ultimately we can disconnect that cable completely and we have infinite resistance (or the resistance of the air gap) so no current (or very little) will pass.

Moving on to an example in the PC we must provide power to the GPU which takes quite a lot. We use several power connectors and cables to provide that Current. If we try to start the PC with one of those cables disconnected the system will detect it and you might see a message suggesting to plug in all the cables. This is done to protect the system.

A set of cables share the Current, and if we didn't plug in a cable, with no protection the remaining cables have a bigger share of the Current, in extreme cases they get hot or might melt. A simple Current limiting device being the Fuse which melts when 'too much power' is attempted to be delivered and the circuit is disconnected.

During a cold spell this year back in March the PC I am on now started to shut down during the first couple of hours of use, this seemed to be after some particularly cold nights. The system powered up OK and the Event log showed for example:

EventID 6008
The previous system shutdown at 11:09:23 on ‎23/‎03/‎2021 was unexpected.

The first thing I did was open the PC and reseated all the power cables and cards, because this is free and it cannot be denied that all the connections in the PC must be good. The PC has not shut down since and I have not fitted a new PSU or exchanged any components.

 

 

 

 

Edited August 16, 20214 yr by SteveW