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PSU replacement - UPS transition problem

post #1 of 13
Thread Starter 
My Antec TP750 is starting to fail, makes horrible noises when the GPUs are on full load, I think a capacitor is about to blow up..

Anyways, I would like to get something above 850W, but here's the thing.. My TP does not work with my current UPS, the transition time, I believe ~8ms, instantly reboots the PC.. All other electronics work properly when I unplug the UPS from the wall, which tells me the UPS is working fine [it's new by the way].. The PC reboots even during idle, and the UPS is over 900VA which should provide at least 400W, which is enough for any PC to keep breathing while idle..

What PSU has a good tolerance for long transitions..?
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post #2 of 13
Quote:
Originally Posted by kpriess View Post

My Antec TP750 is starting to fail, makes horrible noises when the GPUs are on full load, I think a capacitor is about to blow up..
Anyways, I would like to get something above 850W, but here's the thing.. My TP does not work with my current UPS, the transition time, I believe ~8ms, instantly reboots the PC.. All other electronics work properly when I unplug the UPS from the wall, which tells me the UPS is working fine [it's new by the way].. The PC reboots even during idle, and the UPS is over 900VA which should provide at least 400W, which is enough for any PC to keep breathing while idle..
What PSU has a good tolerance for long transitions..?

What UPS is that? Is it a pure sine wave model?
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post #3 of 13
Thread Starter 
Quote:
Originally Posted by trumpet-205 View Post

What UPS is that? Is it a pure sine wave model?

No way is pure sine wave, it is a CDP [most decent thing I could find here]..


Output Wave form
Sine Wave on AC / Modified Sinewave On Inverter


Full specs:
http://www.cdpups.com/product_detail.asp?tb=2&prdid=43
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post #4 of 13
What do you need 850W+ for?

Unless those BD chips suck the power from the teet of life, then a 650W would be sufficient... As for what PSU, I've got Corsair PSUs hooked up to UPS's and they hold out fine wink.gif
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post #5 of 13
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

What do you need 850W+ for?
Unless those BD chips suck the power from the teet of life, then a 650W would be sufficient... As for what PSU, I've got Corsair PSUs hooked up to UPS's and they hold out fine wink.gif

Bulldozer is a power hungry when OC'ing, as in nasty power hungry.. and that combined with dual 6950s at full load.. Even though the 750 can handle it, it's just pushing it..
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post #6 of 13
Quote:
Originally Posted by kpriess View Post

Bulldozer is a power hungry when OC'ing, as in nasty power hungry.. and that combined with dual 6950s at full load.. Even though the 750 can handle it, it's just pushing it..

Righteo then, 750+ watters from Corsair should do you pretty well then. Still, not saying Corsair is the be all and end all, just my recommendation as I know it works thumb.gif
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post #7 of 13
My instinct goes to stepped sine wave. I have heard several stories where their PC (PSU) ended up reboot because of stepped sine wave when UPS kicked in. There are some PSUs that hate regular UPS, and that pure sine wave UPS is the only option. I am not convinced that transition time (transfer time) is the one to blame. 8 ms is within ideal range (2 to 10 ms). Where did you find out about that 8 ms?

My best advice is to buy some quality PSU and test them individually. Don't pull the plug to test them. Just put UPS into self-test mode. To test each PSU just short out the green wire and a black wire on ATX-24 pin connector.
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post #8 of 13
Thread Starter 
Quote:
Originally Posted by trumpet-205 View Post

My instinct goes to stepped sine wave. I have heard several stories where their PC (PSU) ended up reboot because of stepped sine wave when UPS kicked in. There are some PSUs that hate regular UPS, and that pure sine wave UPS is the only option. I am not convinced that transition time (transfer time) is the one to blame. 8 ms is within ideal range (2 to 10 ms). Where did you find out about that 8 ms?
My best advice is to buy some quality PSU and test them individually. Don't pull the plug to test them. Just put UPS into self-test mode. To test each PSU just short out the green wire and a black wire on ATX-24 pin connector.

The box has it's specs, it say's 2-4ms, not sure why I posted 8..

Problem is, I can't test PSUs, the 'law' here is "if you purchase it you keep it".. No one accepts returns on electronics, and the prices are so high that I always import everything from the US [Amazon, Newegg, etc]..

I read that the more "enthusiast oriented" the PSU is, the more susceptible to this problem they are..
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post #9 of 13
Thread Starter 
Crap....


Quote:
It turns out that most PC power supply units with active power factor correction (PFC) do not work well with lower-cost uninterrupted power supplies (UPS), e.g. battery back-ups. This I learned the hard way, as my Antec EarthWatts EA 500 PSU, which I adore, will go dead the second the battery on my APC Back-UPS BX1300LCD kicks in.

That’s because APC’s Back-UPS units output power, when on battery, as a modified sine wave, rather than a true sine wave.

In short, if you send a high-end PSU the current created by a lower-end UPS, the PSU’s built-in power factor correction hates it, and cuts power to the PC immediately. As in, the exact thing you bought the UPS to prevent in the first place is exactly what happens.
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post #10 of 13
Quote:
Originally Posted by kpriess View Post

Crap....

Are you able to get MGE or EATON (the Nova AVR series to be specific) branded UPS' there?

I know for a fact that these work with high-end PSUs
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