can i use ddr3l ram in ddr3 slot

Yes and no, it depends on how picky your motherboard is. fix slot Standard DDR3 is 1. jam reset game slot 5v, eco DDR3 ram runs at 1 25v to 1 35v and some will get those for OC headroom by OC the hell out of them while increasing the voltage up to 1 5v, but they're still safe, since 1 5v is the standard voltage for DDR3 Eco DDR3 should be the same as current DDR3L