Stability of OC'd GPU

[Jordaneer]

So I OC'd my Gigabyte Windforce R9 290, and after a bunch of testing it would basically immediately crash if I pushed it above 1100 mhz and the memory above 1500 mhz, up from 947 on the core, and 1250 on the memory, even 10 higher on either would cause Valley to crash and then I would need to wait for the graphics card to reset after valley crashed, but I ran valley for half an hour at those settings, and it worked perfectly fine, my question is do I need to pull the OC down a bit, say to like 1075 on the core and 1450 or 1475 on the memory, or can I just leave it at what I got it to?

EDIT: This is with the power at +10% in afterburner, but even turning it all the way up to +50%, the card still wasn't stable at anything higher than 1100 mhz core, 1500 memory during valley

[Enderman]

you should test using more than just one benchmark

[Jordaneer]

17 minutes ago, Enderman said:

you should test using more than just one benchmark

okay. I'll try some other stuff, firestrike comes to mind, but what other decent benchmarks are out for relatively cheap (this is my first gaming PC so I don't have a huge steam library to choose from and I'm kinda poor atm

[Enderman]

2 minutes ago, Jordaneer said:

okay. I'll try some other stuff, firestrike comes to mind, but what other decent benchmarks are out for relatively cheap (this is my first gaming PC so I don't have a huge steam library to choose from.

how about games that you already own

those are free

[Jordaneer]

Just now, Enderman said:

how about games that you already own

those are free

like I said, I don't have a big steam library, I have a total of two games, Dirt 3 complete  and dirt showdown because they were on sale on the steam sale. (I didn't have a steam account until literally 6 hours ago)