That's right this year is time of cryptocurrency coorection, slow process of improvement of price increase since the bearish market start early January of this year price dip is almost 70percent loss of bitcoin.
But don't worry according from the history of bitcoin it is a normal, wait for the new jump of bitcoin price increase maybe next year or year 2020 but the price of bitcoin today's aren't bad is stronger.

Basically ever since ZEC was released in November of 2016, most Tahitis like your 7990 went and mined it. The Tahiti's due to the DAG thrashing bug were performing poorly with ETH so most of them did the switch to ZEC. Same with the Pitcairn GPUs like the R9 270X.

Now however most Tahiti's moved onto Cryptonight-V7 and are mining XMR. Since the XMR algo is not very intensive most do a max undervolt to like 0.95V and run at 950/1500 (core/memory) and hash at 500-600h/s (depending on memory type) and it only uses around 125 watts or so. Basically like an RX 470 mining ETH.

Not much profit these days but if you want to put them to work, you can try that algo. I think next month it forks again, so the first week or 2 might be even more profitable as the difficulties adjust.

Very can this week is suitable for profit, I think already from this you can start to grow well, and already start with excellent resources, and with this it is good to start and finish it is desirable.

Hello what do you think about situation on market? Will price of crypto go up to reach new records or it is going down again?

Hello what do you think about situation on market? Will price of crypto go up to reach new records or it is going down again?