Will my build be able to run?

[Epicestperson]

Hi, I just spent the last 4 hours researching stuff about computer parts and eventually came up with the build I want to make.
First time building a desktop.
I'm just wondering if everything will be compatible, and won't die on me.

MOBO: GIGABYTE GA-MA78LM-S2H AM3/AM2+/AM2 AMD 760G HDMI Micro ATX AMD Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128408&cm_re=Gigabyte-_-13-128-408-_-Product

GPU: SAPPHIRE 100245DDR5L Radeon HD 4850 512MB 256-bit DDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102901&cm_re=4850-_-14-102-901-_-Product

Case: Rosewill CHALLENGER Black Gaming ATX Mid Tower Computer Case ,comes with Three Fans-1x Front Blue LED 120mm Fan, 1x Top 140mm Fan, 1x Rear 120mm Fan, option Fans-2x Side 120mm Fan

CPU: AMD Phenom II X4 955 Black Edition Deneb 3.2GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor HDZ955FBGMBOX
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.493015

RAM: G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model F2-8500CL5D-4GBPK

PSU: Antec BP550 Plus 550W Continuous Power ATX12V V2.2 Modular Active PFC Power Supply
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.492813

In conclusion, hoping for some knowledge on whether the computer will be able to fit together and be able to run.

 

[xurwin]

switch video card for a ati 5770

 

[Mr Pizza]

get a DDR3 motherboard and ram, its much faster.

 

[Epicestperson]

After looking at the forums more. I changed up my build to put in ddr3.

http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.494005
-OCZ ModXStream Pro OCZ600MXSP 600W ATX12V V2.2 / EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC Power Supply compatible with core i7
-ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD Motherboard

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231193
-G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model F3-12800CL9D-4GBNQ

Is there any way to get a combo on a 5770 with ram?
The 5770 is so expensive.
If possible, I would like to know any cheaper solutions with the same quality and stuff.