Computer shuts down as if power loss

[Guest firehawk44]

I sooooo do not understand what this means!

LOL. Looks like it was copied from a government policy manual....Best regards,Jim

[ryanbatc 13,047]

If I read this right? To draw summary: True Sine wave is only absolutely required in countries operating on 240v native. http://www.jonnyguru.com/forums/archive/index.php/t-3964.html However money prevailing I would suggest we forgo the electronics lesson and just buy a true sine wave UPS; takes all the guesswork out of the equation.Yet more fuel for the fire; note the authors claimed accreditations: http://www.kerchner.com/electrical/sinewave.htm

EDIT: Oh, I didn't notice that link! Thank you... that's exactly what I've been looking for. He writes a pure sine wave is not needed... then again this article was from 1985 before active PFC power supplies.What I read last night was there's three different types of waves that UPS 's commonly produce:Square, Stepped Sine, and Pure SineThe square is the most efficient, and also the cheapest to produce within a UPS. This form is very hard on PSU's and a UPS with this type shouldn't be used. The stepped sine is much less likely to damage a PSU compared to square. And can also power a PC for a few minutes (to allow for safe shutdown) before damaging the PSU. And of course pure sine is the least efficient but most expensive to produce. It can power any device without issue. Apparently a larger battery is required and more heat is generated with a UPS producing this type.Source was a toms hardware article written by a user...http://www.tomshardware.com/forum/284128-28-tomshardwareSo from that I might be ok with my old UPS, except that I think it has some issues. Stephen should be ok with that little APC then if this is true. I guess I'd want a larger battery if I was running your rig stephen - the one I have (but disconnected) was a 1000va /600w unit - will give me a few minutes to turn off my rig. I'm using a cyberpower surge protector for that side of things (for the rest of my components). This one actually:http://www.newegg.ca/Product/Product.aspx?Item=N82E16812120408CVF&cm_re=surge_protection-_-12-120-408CVF-_-Product

[Superpilotv2 2]

I have also this kind of automatic shutdowns since I have the new build. I tracked it down to (Suprise!!!) my weak PSU, especially the 12V rail. Tried to run an GPU test on the highest setting with OCCT and got this shutdown. so it´s my PSU. But I have no money in the moment, so I´ll have to take care of my GFX card that the settings aren´t too hard.

[Guest jahman]

Square, Stepped Sine, and Pure Sine

Well, you can see for yourself which waveform has the highest peak voltage and is the most likelly to damage a PSU capacitor: The sine wave!As for data loss, Win XP, Vista and 7 all use NTFS, and NTFS implements a log for file system journaling. This means you will not lose data during a power outage and your file system will not become corrupted: When the OS reboots it will use the log to rebuild any damaged files. Caveat: You must disable write caching on your disk drives.IPS are only needed when 24/7 system availability is required (of course WRT FSX it sometimes is! :Big Grin: )Cheers,- jahman.

[Gary A 8]

Well, you can see for yourself which waveform has the highest peak voltage and is the most likelly to damage a PSU capacitor: The sine wave!- jahman.

I would not draw any conclusion from the graph other than its intended purpose; to illustrate different wave forms. Sine is not typically the highest peak and actually the least likely to cause damage.I would not rely on W7 to save my data under any circumstance (it can hardly save itself sometimes, lol), especially if running drives from the Pcie slot like I do and some Pcie SSD fellows do.

[Guest jahman]

Gary, see my previous post.Again, for perfect square waves peak voltage and RMS voltage are equal, IOW the square wave has the lowest peak vs. average voltage possible for any waveform.The squarer the wave, the lower the peak voltage.Cheers,- jahman.

[Gary A 8]

Gary, see my previous post.Again, for perfect square waves peak voltage and RMS voltage are equal, IOW the square wave has the lowest peak vs. average voltage possible for any waveform.The squarer the wave, the lower the peak voltage.Cheers,- jahman.

But our components were designed to use sine not square. There is not a single piece of reference I have encountered to date that would suggest a true sine UPS is not the best.

[Guest jahman]

But our components were designed to use sine not square. There is not a single piece of reference I have encountered to date that would suggest a true sine UPS is not the best.

That's because the input wave form is irrelevant for a switched PSU. But you do need an electronics background to understand why. Review my previous posts and do go to the wikipedia pages I provided. Cheers,- jahman.

[Noel 4,563]

I know a Corsair 850 W PSU should be OK, but you never know when you operate the rig at 5GHZ for many hours.Gerald. Rhttp://www.multicrewxp.com

Gerald, how could 5Ghz for many hours have anything to do with stressing a PSU that is rated for even 600W? Max power draw on the 5Ghz processor is going to be what, maybe 135W? When you run the PSS calculators it seems we all are running ample PSS's for the components involved. I am using a 750W PC Power n Cooling PSS and when I run my machine full tilt (~4Ghz w/ all the machine & GPU specs as noted below) I am only using somewhere around 320-360W.

[ryanbatc 13,047]

Gerald, how could 5Ghz for many hours have anything to do with stressing a PSU that is rated for even 600W? Max power draw on the 5Ghz processor is going to be what, maybe 135W? When you run the PSS calculators it seems we all are running ample PSS's for the components involved. I am using a 750W PC Power n Cooling PSS and when I run my machine full tilt (~4Ghz w/ all the machine & GPU specs as noted below) I am only using somewhere around 320-360W.

Agreed, I used my kill-a-watt the other day to check my system running P95, and then 3dmark (GPU draws obviously), 360w was the very max, and averaged 300w, when running FSX, 260w lol

[nikaslan 9]

SpiritFlyer, just a reminder:Before you proceed to any hardware changes, check your Windows Event Viewer.Check the Administrative Events for any error that occurred just before the system shutdown. It might give you an indication about the cause and might save you money.Best regards,Nikos

[ryanbatc 13,047]

So what is the status Stephen? Any leads?

[SpiritFlyer 987]

SpiritFlyer, just a reminder:Before you proceed to any hardware changes, check your Windows Event Viewer.Check the Administrative Events for any error that occurred just before the system shutdown. It might give you an indication about the cause and might save you money.Best regards,Nikos

Thanks Nikos, As I mentioned nothing shows.

So what is the status Stephen? Any leads?

Hi Ryan, I took the battery unit back and just bought another surge protector bar. I figured that it is unlikely to be the source of the problem anyway. To be honest I have not run FSX enough in the last few days to find out if any of changes has resolved anything or not. Perhaps tomorrow if there is time I will give it a go and report back. Thanks for asking.Kind regards,

[Bob Scott 7,756]

Hey Stephen...I'm still curious how this story ended. Has the dragon been slain?

[SpiritFlyer 987]

Hey Stephen...I'm still curious how this story ended. Has the dragon been slain?

Hi Bob,I answered and posted last night but it disappeared and got lost in the cyber universe somewhere. I have not solved the sudden loss of power problem so I've learned to avoid it by not making longish flights. I have no idea what is causing the power loses at present, but as long as I stay with shorter flights and restart the computer from time to time, it's fine. It could be anything, the CPU, the PSU but I think it must be a weakness in the motherboard, but unless I want to be knocked out of the game for however long it takes for an RMA, it can be lived with, at least for now. It seems strange that it appears so random that it does not seem to point at any one particular thing (in my mind).Kind regards,