I would think the game would run just fine with 4 GB of memory, assuming the cpu and gpu were well above minimum requirements. So, given that, I'd go for a 2x4 GB kit for now. You can always add more later.
System Manufacturer/Model Number Hopalong/ Godzilla OS Windows7 Pro 64bit SP-1; Windows XP Pro 32bit CPU Intel Core i7-870 Lynnfield 2.93GHz LGA 1156 95W Quad-Core Motherboard ASUS P7P55D-E PRO Memory 8GB@1400MHz Crucial Ballistix DDR3-1600 4x2GB Graphics Card ASUS ENGTX460 DirectCU/2DI/1GD5 1GB 256-bit GDDR5 Sound Card VIA Onboard Monitor(s) Displays Asus VS248H-P 24"; Samsung SyncMaster 941BW 19"ws Screen Resolution 1920x1080; 1440x900
Keyboard Logitech K-320 Mouse Kensington PSU COOLER MASTER Silent Pro RS850-AMBAJ3-US 850W Modular Case COOLER MASTER HAF 932 RC-932-KKN5-GP Black Cooling Scythe "Mugen-2 Rev.B" (2 ScytheKaze-Jyuni PWM fans) Hard Drives Samsung 830 120GB SSD
Intel 320 120GB SSD
Western Digital Caviar Black WD7501AALS 750GB 7200 RPM SATA 3.0Gb/s
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s Antivirus Avast Inernet Suite Browser IE 9 ; Chrome
System Manufacturer/Model Number Hopalong/ Godzilla OS Windows7 Pro 64bit SP-1; Windows XP Pro 32bit CPU Intel Core i7-870 Lynnfield 2.93GHz LGA 1156 95W Quad-Core Motherboard ASUS P7P55D-E PRO Memory 8GB@1400MHz Crucial Ballistix DDR3-1600 4x2GB Graphics Card ASUS ENGTX460 DirectCU/2DI/1GD5 1GB 256-bit GDDR5 Sound Card VIA Onboard Monitor(s) Displays Asus VS248H-P 24"; Samsung SyncMaster 941BW 19"ws Screen Resolution 1920x1080; 1440x900
Keyboard Logitech K-320 Mouse Kensington PSU COOLER MASTER Silent Pro RS850-AMBAJ3-US 850W Modular Case COOLER MASTER HAF 932 RC-932-KKN5-GP Black Cooling Scythe "Mugen-2 Rev.B" (2 ScytheKaze-Jyuni PWM fans) Hard Drives Samsung 830 120GB SSD
Intel 320 120GB SSD
Western Digital Caviar Black WD7501AALS 750GB 7200 RPM SATA 3.0Gb/s
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s Antivirus Avast Inernet Suite Browser IE 9 ; Chrome
Dual-Channel DDR3 2200(O.C.) / 1600 / 1333 / 1066 support The motherboard supports DDR3 memory that features data transfer rates of 2200(O.C.) / 1600 /1333 / 1066 MHz to meet the higher bandwidth requirements of the latest 3D graphics, multimedia, and Internet applications. The dual-channel DDR3 architecture enlarges the bandwidth of your system memory to boost system performance.
You do not go with three(3) sticks of RAM with a Dual channel motherboard.
You buy 2 or 4 sticks of RAM. Matched sets placed together.
System Manufacturer/Model Number Hopalong/ Godzilla OS Windows7 Pro 64bit SP-1; Windows XP Pro 32bit CPU Intel Core i7-870 Lynnfield 2.93GHz LGA 1156 95W Quad-Core Motherboard ASUS P7P55D-E PRO Memory 8GB@1400MHz Crucial Ballistix DDR3-1600 4x2GB Graphics Card ASUS ENGTX460 DirectCU/2DI/1GD5 1GB 256-bit GDDR5 Sound Card VIA Onboard Monitor(s) Displays Asus VS248H-P 24"; Samsung SyncMaster 941BW 19"ws Screen Resolution 1920x1080; 1440x900
Keyboard Logitech K-320 Mouse Kensington PSU COOLER MASTER Silent Pro RS850-AMBAJ3-US 850W Modular Case COOLER MASTER HAF 932 RC-932-KKN5-GP Black Cooling Scythe "Mugen-2 Rev.B" (2 ScytheKaze-Jyuni PWM fans) Hard Drives Samsung 830 120GB SSD
Intel 320 120GB SSD
Western Digital Caviar Black WD7501AALS 750GB 7200 RPM SATA 3.0Gb/s
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s Antivirus Avast Inernet Suite Browser IE 9 ; Chrome
System Manufacturer/Model Number Hopalong/ Godzilla OS Windows7 Pro 64bit SP-1; Windows XP Pro 32bit CPU Intel Core i7-870 Lynnfield 2.93GHz LGA 1156 95W Quad-Core Motherboard ASUS P7P55D-E PRO Memory 8GB@1400MHz Crucial Ballistix DDR3-1600 4x2GB Graphics Card ASUS ENGTX460 DirectCU/2DI/1GD5 1GB 256-bit GDDR5 Sound Card VIA Onboard Monitor(s) Displays Asus VS248H-P 24"; Samsung SyncMaster 941BW 19"ws Screen Resolution 1920x1080; 1440x900
Keyboard Logitech K-320 Mouse Kensington PSU COOLER MASTER Silent Pro RS850-AMBAJ3-US 850W Modular Case COOLER MASTER HAF 932 RC-932-KKN5-GP Black Cooling Scythe "Mugen-2 Rev.B" (2 ScytheKaze-Jyuni PWM fans) Hard Drives Samsung 830 120GB SSD
Intel 320 120GB SSD
Western Digital Caviar Black WD7501AALS 750GB 7200 RPM SATA 3.0Gb/s
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s Antivirus Avast Inernet Suite Browser IE 9 ; Chrome
System Manufacturer/Model Number Hopalong/ Godzilla OS Windows7 Pro 64bit SP-1; Windows XP Pro 32bit CPU Intel Core i7-870 Lynnfield 2.93GHz LGA 1156 95W Quad-Core Motherboard ASUS P7P55D-E PRO Memory 8GB@1400MHz Crucial Ballistix DDR3-1600 4x2GB Graphics Card ASUS ENGTX460 DirectCU/2DI/1GD5 1GB 256-bit GDDR5 Sound Card VIA Onboard Monitor(s) Displays Asus VS248H-P 24"; Samsung SyncMaster 941BW 19"ws Screen Resolution 1920x1080; 1440x900
Keyboard Logitech K-320 Mouse Kensington PSU COOLER MASTER Silent Pro RS850-AMBAJ3-US 850W Modular Case COOLER MASTER HAF 932 RC-932-KKN5-GP Black Cooling Scythe "Mugen-2 Rev.B" (2 ScytheKaze-Jyuni PWM fans) Hard Drives Samsung 830 120GB SSD
Intel 320 120GB SSD
Western Digital Caviar Black WD7501AALS 750GB 7200 RPM SATA 3.0Gb/s
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s Antivirus Avast Inernet Suite Browser IE 9 ; Chrome
System Manufacturer/Model Number Built by badgers!!! OS Windows 7 Ultimate x64 & Mac OS X 10.7.1 CPU Intel Core i5 2500k Motherboard Asus P8z68 Memory Corsair Vengence 8gb 1866mhz Graphics Card XFX Ati HD6950 2Gb Sound Card Mobo Optical to Yamaha Rx-V667 7.2 home cinema system Monitor(s) Displays Samsung LED 32" TV Screen Resolution 1920x1080
Keyboard Saitek Cyborg V7 Mouse Saitek R.A.T 9 PSU Corsair HX650w Modular Case NZXT Phantom White Cooling Corsair H60 Push/Pull Hard Drives 120gb Corsair Force 3 SSD Internet Speed Too slow! Other Info AMD fusion E350N Home server-Windows Home Server 2011 (also made by badgers!)
2011 Macbook 2.4ghz Core2Duo, 4gb ddr3, 120gb Ocz Vertex SSD