bought anew GPU and having problems with games

[Syper]

Hi,i just upgraded my PC with aGTX 780 and its been causing problems latly,when i play games in high graphic options my pc crashes and restarts i am also getting low frames in games like crysis 3 even on the lowes settings and i know that a gtx 780 should not run like that.i think its my power supply but if any of you see any other problems with my build please tell me
System specs:System Information report written at: 02/16/14 20:53:29
System Name: USER-PC
[System Summary (C:\Users\user\Desktop\sdasd.nfo)]

Item Value
OS Name Microsoft Windows 7 Home Premium
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name USER-PC
System Manufacturer Gigabyte Technology Co., Ltd.
System Model GA-MA790FXT-UD5P
System Type x64-based PC
Processor AMD Phenom(tm) II X4 965 Processor, 3400 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date Award Software International, Inc. F5, 21/05/2009
SMBIOS Version 2.4
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale Israel
Hardware Abstraction Layer Version = "6.1.7601.17514"
User Name user-PC\user
Time Zone Jerusalem Standard Time
Installed Physical Memory (RAM) 8.00 GB
Total Physical Memory 8.00 GB
Available Physical Memory 5.76 GB
Total Virtual Memory 16.0 GB
Available Virtual Memory 13.7 GB
Page File Space 8.00 GB
Page File C:\pagefile.sys
and my power supply is 350 watz and i have a gtx 780
please help me and tell me what is wrong with my pc and how can i make it better,thanks for any body who helps

 

[aloof11]

Yea you need to upgrade your PSU before you damage your computer, the reason why it might be crashing is that when gaming your GPU is demanding more power and your PSU isnt able to deliver it hence why you computer might be restarting

I would upgrade to a 650W PSU though Im sure a 550W will suffice

 

[Syper]

will it also increase my fps?

 

[aloof11]

Yea and also wont damage your other computer components , try looking for a Corsair or Seasonic brand for your PSU something like these: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151096 or http://www.newegg.com/Product/Product.aspx?Item=N82E16817151137

Make sure it'll fit in your case etc

 

[Syper]

im kinda short in cash so will aCorsair CP-9020050-WW VS550 VS Series 550W be enough?

 

[aloof11]

If you dont plan on overclocking then the 550W should be good but see if you can find a 600W+, as they seem to be around the same price as 550Ws

 

[Syper]

Ok thanks alot fot the help!