Hi, friends -
[FONT=verdana]i m new in the graphics world, So[/FONT]
[FONT=verdana]I want to know that how much PSU power required for [/FONT]
[FONT=andale mono][SIZE=5]3 SLI[/SIZE][/FONT] 
[SIZE=5]XFX 9800GTX+ 512 DDR3:)[/SIZE] card??
Means overall PSU wattage i want to know???
It depends on your other components as well, but approximately 1000-1100 watts. here is a psu calculator - http://support.asus.com/powersupply.aspx
You would need to post the rest of your specs as M_Kincy said.
I dont have that kind of board for SLI
but i want to the answer for future…
My specs are -
Motherboard : Intel 945GCCR
Ram : 2 GB Kingston DDR2
HDD : Segate Barracuda 1 TB 7200 + Segate Barracuda 160 GB 7200.
Processor : Intel Pentium D(Dual Core) 3.00 GHz.
PSU : Solitier 500w.
DVD_+ RW : LG multi Layer
Speaker : Creative 2.1 370 SSB
GPU : XFX 9800 GTX+ 512 MB DDR3 PCI 16x1(new not installed)