Can i SLI with this psu

I want to SLI my GTS 450 presently i have the following card if possible i will get one more
ASUSTeK Computer Inc. - Graphics Cards- ASUS ENGTS450 DirectCU/DI/1GD5

My psu Model is Tagan Stonerock -TG500-U37
Voltage Table
Model TG500-U37 500 W "StoneRock Series"
AC Input 230VAC (200V-240V) 6A 50Hz
DC Output +3.3 V +5 V +12 V1 +12 V2 -12 V +5 VSB
Max Amps 24 A 22 A 18 A 18A 0.5 A 2.5A
Max Combined 130 W 432 W / 36A 6 W 12.5 W
Total Power 500 W

Please suggest