stress test for osx

[Alan.L]

i have a old working Macbook Pro 15" i7 2010 here and i'am trying to get rid off by selling on eBay. i've replaced the c9560 just to prolong the MacBooks future stability. i got it returned back to me twice by two buyers. Buyer said it shutdown on them. Buyer thinks its the GPU causing problem. i've ran ASD OS, EFI and have passed all the tests. Memtest passed.
no problem running Heaven Benchmark.

i've been running for a week without problem. i haven't had any GPU glitch. i've replaced the old HDD and keyboard just incase if they are the culprit.
charger is original. battery is in good health.

is there any software utility i can use to test the mac? or should i just sell it as faulty? or just me being unlucky getting bad ebay buyers?

thanks

 

[Gurmon]

Just use it as your own laptop for a four or five days. If it survives deem it good.

 

[Alan.L]

Alright ? Only way to find out.

 

[dukefawks]

GPU does not cause shutdown, it will reboot. Bad RAM or slot could cause shut down.