PSU change from an HP XW4400 to lenovo thinkcentre m92p and backwards

Jan 17, 2019
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Hello guys i have found a great deal on a lenovo thinkcentr m92p with an i7 3770 8gb ddr3 ram ssd 240gb samsung evo. My problem is the fact that It has a 280watt psu and i want to add a gtx 750 ti to the build. Since i am on a budget i can't buy a new corsair cx550m psu and use a 24 to 14 pin adapter. CAN i use the psu of my Hp XW4400 with an adaptor on the lenovo and the psu of my lenovo in my HP.
 
Jan 17, 2019
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MERGED QUESTION
Question from johnxdgamer : "*PLZ NEED HELP GTX 750 TI AND A 280watt psu*"

HEllo so i have found this great deal on a lenovo thinkcentre m92p with an i7 3770 8gb ddr3 ram samsung evo ssd240gb but the downside is that it has a 280watt psu. If i were to buy the pc i would be stuck with the psu because of my budget limitations and the fact that if i ever upgrade the psu i will need 24 to 14 pin adapter is something risky on my end cause i don't want to fry my pc.
SO my Question is WIll the 280watt psu be sufficient for the whole system?
System
CPU:i7-3770 (stock)
GPU:GIgabyte windforce oc Gtx 750 ti (2gb) needs a 6pin...
RAM:8gb ddr3 1600mhz (if i instal 8 more will there be a problem?)
HDD:Seagate barracude 7.2rpm 1T
SSD:Samsung 850 evo 250gb
Fans:At least 2 120m fans and 1 80-92?
Cooler:Stock?


Also quiestion number 2 if i use a 6pin to sata and not molex will i have a better chance not to fry my pc?