Configuration question

[Uncle_Woody]

I am considering purchasing an HP HPE300z:

Operating system Genuine Windows 7 Home Premium 64-bit
Processor AMD Athlon(TM) X4 635 quad-core processor [2.9GHz, 2MB L2, up to 4000MHz bus]
Memory 6GB DDR3-1333MHz SDRAM [3 DIMMs] from 4GB
Hard drive 750GB 7200 rpm SATA 3Gb/s hard drive
Primary optical drive LightScribe 16X max. DVD+/-R/RW SuperMulti drive
Networking Integrated Ethernet port, No wireless LAN
Front Productivity Ports 15-in-1 memory card reader, 1 USB, 1394, audio
Sound Card Integrated sound

I am planning on having it built with a ATI HD 5770 Video card. My main concern is that the system has merely a 300-watt power supply. AMD RECOMMENDS a 400-watt system for this card. I plan on doing marathon gaming daily (Final Fantasy Online- http://www.ffxivinfo.com/systemreqs.php for requirements).

Will a 300-watt system suffice with this setup; do you think this system will be sufficient?

PS. I cannot even buy the components and build a system like this for the asking price (639)

 

[Mousemonkey]

This topic has been moved from the section CPU & Components to section Systems by Mousemonkey