I have this hp d4999t with that Nvidia 520 and while it's OK, the total system draw is about 105 Watts when a game runs. So while I like to see BIG POWER SUPPLIES I can't see why here.
Also I've had too many issues with that AMD line so back to Intel for now.
If this was me, I'd get similar with the Intel CPU then pick a video card from this list.
You can do better.
<span id="INSERTION_MARKER">Hi, i'm just wondering if you think that the following computer spec is going to work well as both a gaming computer, (for online and offline games) and as a home computer, (for things such as Microsoft office etc.) and also for running CAD software? Is the motherboard going to be able to support all the components?<span>
<span>Computer Case - X-Blade Black <div><span>CPU - AMD FX 8120 (8 x 3.1 GHz) AM3 16MB - Black Edition
<span>CPU - Heatsink Be Quiet! Dark Rock Advanced BK014 - Silent
Memory - 16GB (4x4GB) Corsair DDR3 Vengeance Jet Black, PC3-12800 (1600), Non-ECC, CAS 9-9-9-24, XMP, 1.50V (CMZ16GX3M4A1600C9)
Graphics Card - NVIDIA GeForce GT 520 - 2 GB - (PALIT) - (PCI-E)
Motherboard - Asus M5A78L-M/USB3 (AMD 760G) - VGA
Sound Card - Motherboard Integrated HD Sound Networking - Edimax Wireless LAN 300Mbps (PCI)
Power Supply - 700W PSU
Hard Drive #1 - 1 TB (1000 GB) SATA-III HDD 7200 RPM 32MB
Optical Drive #1 - Samsung 24x DVD Re-Writer/Reader /- RW- Black - Lightscribe (SATA)
Operating System #1 - Microsoft Windows 7 Home Premium 64 BIT (Genuine DVD & COA Included)