hi all,

i'm newbie and last month i buy this laptop:-

Compaq Presario CQ45-127TX Notebook PC


FreeDOS; Intel® Core™2 Duo Processor P8400 (2.26 GHz, 1066 MHz FSB, 3 MB L2 Cache)

1024MB 800MHz / max to 4GB* DDR2 Memory (1024 x 1 pcs)

14.1" TFT WXGA high definition widescreen LCD panel with brightview technology

160GB; DVD +/- RW Double Layer Drive with LightScribe

Bluetooth; 802.11a/g/n; Integrated 10/100/1000 Gigabit Ethernet

ports include 3 USB 2.0, HDMI, eSATA Combo, VGA, RJ-11, RJ-45, Expansion Port 3, 1 Headphone, 1 Microphone
Consumer IR, Integrated FIngerprint reader, Compaq Webcam with Integrated Digital Microhphones (VGA low-light)

5-in-1 intergrated digital media reader slot; Nvidia GEForce 9200M GS with 256MB dedicated video memory

ok, my question is:-

If i upgrade 4gb 800mhz, can i use this laptop with vista x64??How is the performance than vista x32? correct me if i'm wrong..B4 i make a upgrading of this laptop...