Hello, I am your newest newbie

I have most of my stuff going good, except for on my new GigaByte GTX660 OC card.

I only produces about 60 M/Hash with builtin OpenCL in GUIminer and about 70 using cgminer.

But, my old 8800GT does 28 M/Hash, so something must be wrong ? The GTX660 is pretty recent but the 8800GT must be 10 years old soon?

I have two Sapphire 6790 cards crunching at about 400 MHash though

TL;DR:
New and shiny GTX660 gives 70 MHash, but ancient 8800GT gives 28MHash, wat do ?

Edit: Also tried the separate CUDA miner (rpcminer-cuda.exe), it was not any better.