Hi guys, i have Intel Celeron 1.7 machine, with 1Gb RAM and 128 Graphics, is it a good idea to put a 512MB graphics? will it crash my sytem? what would you recomend and wher can i buy? here s the link to my motheroard..http://www.gigabyte.com.tw/Products/Motherboard/Products_Overview.aspx?ProductID=1766