BSOD STOP 0x50

I am an administrator of 12 HP netserver LH3 application servers. One particular server has been recieving the BSOD STOP 0x50 PAGE_FAULT_IN_NONPAGED_AREA… the server had lop-sided processor times 90%/20% with processor queue lengths in excess of 7. HP has replaced a processor (dual PII 400)and the processor times are now equal yet very high 90% for each. The STOP 50 continues with failures arriving nearly the same time during weekday mornings. Never on weekends and never after 11am. Also after monitoring other identical servers some have processor queue lengths that avg 14 and never have any problems or failures, the servers are identical Dual PII 400, 256MB RAM. Could this be a RAM issue?