deny the resources it needs. like: application is developed for 256MB Ram or higher. you test on 64Mb Ram see it fails and fails safely
Load testing: for client/server applications { 2-tier or hgher }
Your reqt: 5000 users at a time. Check throughput of application, if achieved, load testing for reqd load is done. If not tune the application developed and/or servers
load testing:-To estimate the performance of a s.w when number of concurent users are accessing at a time.
STRESS TESTING:-estimating the performance of a s.w under different load levels.
 Posted by: meelayugandhar Date:
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Load Testing: Estimating the performance of server or CPU under customer expected configuration load is called load testing.
Stress Testing: Estimating the performance of server or CPU by applying max load or peak load.
 Posted by: M.Naveen Reddy,hyd,A.P. Date:
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In Stress testing, apart from the above information there is more of hardware dependency kind of testing (like: less CPU, less RAM rtc..) But in load testing, focuses on number of user over a certain peroid of time (like normal users, more than normal user, huge number of users, unbearable number of users etc...)
Hope I am able to help u guys!!
 Posted by: Amit Date:
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Load Testing: how well the S/W can give suppport to MAx no of users ehrn they use at a time/concurently
Stress : Testing the application with Low conditions like Low disk space and low memory nothing but pull down the resource