Just recently bought Vostro 420 ... with ATI Radeon HD3450 ... big mistake with the graphics card ... I spend time on Second Life ... and this just doesn't work well at all ... question ... if I pick up a GF9800 GT 512 ... will I need to upgrade the power supply also ... and will the cooling requirements exceed the stock fans? Dell listed the 9800 as an upgrade at time of purchase ... but it was +$300 ... so I am wondering what they provided ... thanks ... Jo