A:AnswerIt depends on the rest of the system. The Dynex 400w PSU, if you dissect it, is only rated for 250w continuous power. See this review:
http://www.hardocp.com/article/2008/05/13/getting_best_buy_on_power_supply/2#.U1kcY1VdXHo
If the rest of the system has anything more than basic components, then the answer might be no. Best Buy carries a Thermaltake 430w PSU that would be better, and is only $5 more:
http://www.bestbuy.com/site/430w-tr2-atx-power-supply/9827301.p?id=1218179698427&skuId=9827301&st=categoryid$abcat0507009&cp=1&lp=3
Alternatively, you could go for the Corsair taht is only a little more and is a really great PSU in terms of quality:
http://www.bestbuy.com/site/cx-series-modular-cx750m-750w-atx-power-supply/8324202.p?id=1218872214205&skuId=8324202&st=categoryid$abcat0507009&cp=1&lp=1
It will also allow further upgrades down the line, and would easily go into your next system.
A:AnswerIt should not be a problem but to double check, look at the back of your powersupply and make sure the plug port which protrudes from the back of your DELL chassis will work otherwise it should not be a problem. On the upside, Best Buy will replace it if it doesn't and give you full credit.
A:Answer"80% when pulling between 40% and 60% from its nominal capacity (between 160 W and 240 W). On all other load patterns efficiency stays below 80%, hitting a hard bottom during test seven, at 71.9%."...
^^^^ https://www.hardwaresecrets.com/dynex-400-w-power-supply-review/7/
A:AnswerYou will need to check with HP on the power requirements of your computer, and also factor in any upgrades you may have done, to know if this is the proper sized power supply. The wiring is color coded or labeled very clearly and this comes with instructions.
