I'm using GUIMiner + scrypt to mine LTC and I've noticed my hash rate dropped about 1/5 (from 500 khash to 400) on two cards in one of my rigs.
I'm wondering why this was the case.
The cards run really hot, and I'm wondering if it could be because I handled them right after powering the machine down and not giving them enough time to cool off? This may sound silly but I really can't think of any other reason.
All I did was power down the machine, pull a card out (it's a caseless rig, just a motherboard sitting on a plastic shelf) and replace it afterwards.
The heatpipes were very hot. In retrospect I should have waited but I was impatient to test another card I had just gotten.
I'm wondering if anyone has any ideas.. Thanks