Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Will this work with Dell XPS 8500
Document: The first unit was defective and was replaced. The second unit will not work with a Dell XPS 9000 computer. Rather than keeping the computer on, it shuts it off on a power failure. This is caused by either the long switching time or the imperfect sine wave; It's not important which.I will say that customer service was exceptionally helpful; both in replacing the old unit and in recommending a unit that produces a better sine wave.
We use this model UPS for our older computers whose power supplies are tolerant of stepped square-wave voltage waveforms. This unit will not work on many of the newer computers like Dell XPS Studio series that require a pure or close to pure sine wave to work (a European standard for power factor requirements now being seen in the USA).Plan on spending a lot more money on a backup UPS if your computer's power supply requires a pure sinewave input.
Before I purchased at Best Buy a much more powerful Ciber Power "Reliability,Quality,Value" - Battery Backup, 1350VA, 810 watts @ $145.00, I asked their "geek" if it would work with my Dell, studio XPS 9000 and he said "Yes", so off I went with what I thought was the answer. After several quick tests with the computer I sadly discovered that even the mighty Ciber Power didn't keep the XPS 9000 from rebooting during power a failure. Oh My!
It does not work with modern active PFC power supplies that needs a pure sine wave. It did not work on my 3 year old Dell Studio XPS 435t computer. APC technical support confirmed that this product will not work with pure sine wave power supplies and they do not offer any products in this price range that work with modern power supplies.This product is non-returnable because of the safety reasons.After a week of discussions with technical support I bought CyberPower CP850PFCLCD UPS that works very well.
They cut out and shut down my Dell XPS 435T with a 475W power supply. I should have done my homework and upgraded my UPS instead of using the one I already had.I still rate it 5 stars, because it does what it is supposed to do very well, if you choose the correct model for your equipment.
Our home was struck by lightning last August. The damage included Vinyl siding, the LED Display and controls of the stove, the Ethernet cards in the DVD and the Tivo, the garage door motor, the PC Hard Drive and the PC which just simply gave us the occasional "blue screen" of death until we replaced it with a new Dell XPS. Total cost $2500.
In one 750G battery backup mode I have a PC with a 750w power supply, Asus Sabertooth motherboard, AMD 8350 chip and a 550Ti video card. It also has a 24" Samsung monitor and the base for a wireless phone on battery backup. In battery backup on the other 750G is my wife's 3 yr old Dell XPS, 24" monitor and router.
Returned because of lack of pure Sinewave - It just did NOT protect my Dell studio XPS ...Again, Another Dirty Little Secret in the Computer Industry !Dell Computer has chosen to make their fast, advanced studio XPS 9000 computer with Windows 7, using a new power supply that is INCOMPATABLE with all reasonably priced UPS units that use "simulated sinewave" technology".. . . Several weeks ago . .
I explained that it was a Dell Studio XPS 435T with the new Core i7-920 processor. The tech support representative did a bit of research and found that the power supply in my computer is not compatible with the APC unit I had purchased. I was told that the BE750G provides power in or as a "stepped approximation to a sinewave" when on battery power and that the power supply in my computer required a UPS that provides a "pure sinewave" when on battery power.
Watch out when buying a UPS for newer higher power computers. This one shut down my Dell XPS 435T with a 475W power supply. I thought it would handle my Dell but you need a type with true sine wave not simulated. Don't know if I'm ready to spend $150 for one to handle the computer and 2 monitors, not to mention cable modem and router. Atleast the return policy was great. Take my advice and do a lot of research when buying a UPS.
Answer: This UPS is rated at 750VA (volt amps which is 750 watts).  However due to phase mismatch as a result of powering capacitive and inductive loads, the actual power available from the UPS may be less that the rating.  Also remember that you will probably put more than the Dell XPS 8500 on the UPS; examples would be monitors, backup drives, powered speakers, and non-laser printers.  (Do not put laser printers on a UPS, they pull too much power.)  Add up the power requirements of all the equipment to be powered, and if about 50% of 750VA it should be OK.  Also remember that run time of the UPS is related to the load - the greater the load the shorter the run time.  Will it work with the Dell XPS 8500 - YES, if that is the only device being powered, but if not calculate the power requirements and your expected run time.