Hi guys! I'm actually not quite familiar with computers but can you help me upgrade my ram? Any recommendations of what ram should I buy would help. I've been looking up for articles about upgrading ram but I really can't absorb all the information in my head. Can I add a ram stick like 4gb/8gb or should I add the same ram 2gb? Sorry for my English... I hope you can help me. 
Operating System
Windows 7 Ultimate 64-bit SP1
CPU
Intel Core i3 540 @ 3.07GHz 50 °C
Clarkdale 32nm Technology
RAM
4.00GB Single-Channel DDR3 @ 686MHz (9-9-9-24)
Motherboard
BIOSTAR Group TH55B HD (CPU 1) 59 °C
Graphics
DELL E2314H (1920x1080@60Hz)
1023MB NVIDIA GeForce GTX 560 (NVIDIA) 62 °C
Storage
298GB Seagate ST3320613AS ATA Device (SATA) 44 °C
Optical Drives
ELBY CLONEDRIVE SCSI CdRom Device
Audio
USB Audio Device
Operating System
Windows 7 Ultimate 64-bit SP1
CPU
Intel Core i3 540 @ 3.07GHz 50 °C
Clarkdale 32nm Technology
RAM
4.00GB Single-Channel DDR3 @ 686MHz (9-9-9-24)
Motherboard
BIOSTAR Group TH55B HD (CPU 1) 59 °C
Graphics
DELL E2314H (1920x1080@60Hz)
1023MB NVIDIA GeForce GTX 560 (NVIDIA) 62 °C
Storage
298GB Seagate ST3320613AS ATA Device (SATA) 44 °C
Optical Drives
ELBY CLONEDRIVE SCSI CdRom Device
Audio
USB Audio Device
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