need help with power adopter

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hey guys!

 

here pc spec - old pc spec!

- i7 950 3.07ghz

- msi x58m

- 1gb x 6 = 6 gb crucial ...

- hdd c: - wd raptor sata 2 150gb

- club 3d ati radeon hd 4890

- 3 hdd sata 2

- chieftec 3 bay hdd box 4 sata2 hdd - have 4 hdd there dont work time turn them on when need it

- chieftec 750w ... aps-750c

 

now did changes!

 

i put ati card 2nd pc , updated ram, have :

 

- evga gtx 580 classified 3 gb

- 4gbx3 = 12gb corsair

 

1st 2 weeks fine, cant turn on pc....... in order turn on disconnect power cable, wait time connect again , if try turn on right away not work , after connect cable wait 30 mins , strarts working...... after turned on there no problems, working fine, each time after turn off cant turn on, , have make "procedure" each time turn on pc!

 

now took chieftec 3 bay hdd box , put on pc, hoping better , nope

 

is power? 750w not enough? recomendations new power box?

your power supply might little marginal gtx 580.  require 12 volt supply capable of 42 amps or 405 watts.probably way check use external voltmeter.  chance return gtx 580 , possibly go gtx 670?  reqiures 30 amps.  here found on specs on 12 volt rails

 

"the psu rated output power 550 watts , can yield 450 watts across +12v rail. thus, effective output power (i.e. can in real computer consumes +12v power rail) 500 watts, good. +12v rail split 2 “virtual” lines, 25 amperes each."

 

if initial surge turned on @ once not feel comfortable system , power supply.  if read right have 3 additional hard drives inside unit.  if can disconnect  power them quick test , turn on computer might isolate problem.  typically each disk requires 20 watts on startup



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