Q:

How to quickly check Ethereum Hashing Speed? 

I have 4-5 different GPUs with me.  What would be the easiest way to quickly run a Hashing Speed Test on those cards assuming I already have the Drivers for them installed? 

A:

You have the choice betwen :
1-running eth or ethminer :
ethminer -M -G 

2-using niceHash tool :
https://github.com/nicehash/NiceHashMiner

