Garry mod Crashes

When ever i play the new map Rp_evocity2_v1p i keep on crashing it stops and it closes my Gmod please help

e43 gigabyte Motherboard
Intel 2 core duo 2.66 ghz 6mb
evga 250 gts SuperClocked Edition 512mb
500 watt coolmaster psu
4 GB memory patriot
640 gb HDD


Anyone :[