I am mining LiteCoin (BTC difficulty too high to bother with anymore), and I currently have a 7970, 3 6950s, a 6870, and a 6770 hashing a bit over 2.0 Mhash/sec on LiteCoins now.
I have decided to throw 3 more 7000 series cards into my mining operation, and after a lot of eBay research and seeing the prices, I will buy new GPUs with warranties rather than spend $10 less and get someone else's old used hardware.
I can get new 7950s for around $220-$230 at newegg, whereas 7970s don't start until ~$290.
Can 7950's be pimped up enough to provide comparable hash rates to 7970, or would 7970's make enough difference to be worth the extra cost?
I have a 7970 running in my main PC, and at 1000/1500 clocks and 19 intensity on CGMiner 3.3.0 and Windows 7 64 bit, it can touch 650 Khash/sec with no overvolting.
