Is this build compatible? will it work?

[jerryproski]

1.motherboard: GIGABYTE GA-990FXA-UD3 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard

2.Graphics card: EVGA 01G-P3-1282-RX GeForce GTX 280 1GB 512-bit GDDR3 PCI Express 2.0 x16 HDCP

3.processor: AMD FX-4100 Zambezi 3.6GHz (3.8GHz Turbo) Socket AM3+ 95W Quad-Core Desktop Processor FD4100WMGUSBX

 

[dns7950]

Yes, those parts are compatible. However, that video card is very outdated (several generations old) and that CPU is last-gen (Vishera is better than Zambezi). If you don't already have the parts, I would definitely get something else. If you want more help picking out parts for a new build, please read this and follow the format given:
http://www.tomshardware.com/forum/353572-31-build-upgrade-advice
We would need to know what the computer will be used for, what parts you already have, what your budget is, and what country you are in so we know what currency and sites to go by...

 

[jerryproski]

gaming; already have Power unit 600w, 8 gig ram card, 250g hard drive, 60g hard drive, 7200 rpms, my budget is 200$ on the graphics card and processor, usa

 

[jerryproski]

new picks, is this a better alternitive?:
1.AMD FX-6300 Vishera 3.5GHz (4.1GHz Turbo) Socket AM3+ 95W Six-Core Desktop Processor FD6300WMHKBOX
2.EVGA 04G-P4-2649-KR GeForce GT 640 4GB 128-bit DDR3 PCI Express 3.0 x16 HDCP Ready Video Card

 

[jerryproski]

Best answer selected by jerryproski.

 

[dns7950]

For gaming purposes, I would say that build is actually worse.. I didn't think about how cheap a GTX 280 would be nowadays, I didn't think they would even still have them on newegg... That card was the very top-of-the line in it's day, and will still be a bit better than brand new low end cards like the GT 640. Your first build would actually be better, since games depend more on the graphics card than the CPU, and the fx-4100 is still a good CPU.. However, there is still room for improvement!! You could get a cheaper motherboard and then put the money saved towards the video card.. Since your budget for the motherboard and video card is~$240, a better choice would be

Motherboard:ASRock 970 EXTREME3 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard

Video Card:EVGA 01G-P4-3650-KR GeForce GTX 650 Ti 1GB 128-bit GDDR5 PCI Express 3.0 x16 HDCP Ready Video Card

Really there is no point in paying extra for a motherboard that supports SLI/Crossfire... Your 600W power supply couldn't even handle 2 GTX 280s. You are always better off just getting the best single card you can afford.
A GTX 560Ti would perform quite a bit better than a GTX 280.. The GTX 280 is outdated, the technology is 4+ years old.. It only supports DirectX 10 when DirectX 11 is the standard now, it uses older and slower GDDR3 memory vs. the newer, faster GDDR5 memory all the new cards.. It uses about twice as much power as a 650Ti...