I do like the RX series.  I picked up my first GPU and it was an RX for $320.  It was never used for mining and the guy was military and didn’t want to pick up and move his rig each time.

A guy that lives close has 2 RX 470s and he is willing to sell each one for $280.   Is this a good deal or not?   I was thinking that if I can bios mod these with the 570 bios, i could get similar performance to an RX 570 which I currently have one of.  

Can these run a RX 570 bios?  I have read a few places that RX400 series can be flashed to the RX500 series.  I am sure there are cases where you can and cannot but I have not see those results.   ROI is not real issue, because I plan to build two nice computers if this thing goes south.  

Also, I saw you can preorder two 1080s for $549, but I am not sure if i can convince the wife I NEED it. lol
So would going with the 1080 be a better choice? So is 2 470 better than one 1080.   I think I know the answer but I want to hear from the PROs.  

I like what you wrote and especially this point which I think sums up what I am doing.   Mine stuff that I think are good and could have a future and then mine some others and see what happens.   I think the ROI point holds true and if you really don't care if you get the money back (me) everything is a win win or if it goes to 0 then it was a fun experience but the future does not look good.  When I want to buy something, I always bring up ROI with the wife and I can usually talk her into buying it.  lol

I am taking that into account but I was going to worry about it when I am running more GPUs.   I am getting about 14 cents for electric per killowatt.  Is that about average?   

I am trying to determine if I should upgrade my motherboard before I do anything else.   I think I might start a new thread so that it doesn't bleed together with this one.   

Since I am using an 8-10 year old power supply I was afraid messing with the bios and doing something bad to the card if I wasn’t giving the card enough power.   I did the bios update once but rolled it back when I realized I was on a old driver version so I updated it to the latest.  I will try it again tonight unless I should go to a particular driver.  When I did mod the bios and played around with setting in afterburner, I started to see some real low hashrates from 250 to 150 so I revert it all back.

I was going to start mining ETH but didn’t spend the time to install the wallet and get my address so I went on with Zcash because I had that address already. 

I was thinking 3 would be good for this and I don’t know when I could add the 4 with finding a good price

So should my hashrate go up to 400 sol and drop to 60 sol within an hours time or should it stay consistent with say 270 sol

 I am mining zcash with rx570 and should do 270 sol/s our of the box but I am averaging 250 sol so I am wondering if I am not giving it enough power to cause this

Can I attach a picture from my phone?

I thought 6 would be pushing it.  So when someone says a 1200watt is over kill for a 6 card rig 1070 and rx480, would you agree?  I do have a question about hashrates and maybe if it is related to what I am seeing on nanopool’s stat site.  Do you have spikes in you hashrate or should it be relatively flat line?

This power supply is $69.99.   Is it a good PSU to start out with and it would be powering a RX570 and planning on at least two more cards once I get my tax money and when I can find them.   It looks like I can safely power 4 GPUs but would it be able to handle a 6 card rig, if I make it that far? 
 
I am currently running my GPU off a no name PSU that is 400watt and I am using two molex connectors to the PCIE power converter to power the GPU.   Seems to be ok but if I mess with any of the GPUs settings I get terrible performance.   I have chalked this up to probably the PSU not doing its job correctly.   

https://www.bestbuy.com/site/corsair-cx-series-modular-cx750m-750w-atx-power-supply-black/8324202.p?skuId=8324202

I have a guy that wants $60 for a EVGA 750 watt USED bronze+ PSU and I thought that might be a good deal but probably not.