so should i go with AMD (probably a 4gb gpu) and mine Monero or Ethereum or go wtihn Nvidia and mine Zcash (probably gtx 1060 3gb)?

yea but the DAG file seems like it's gonna mess up rx cards real bad.

I saw some posts about DAG file on ethereum and it influencing AMD cards (all rx cards the most).
apparently they don't seem to have a bright future, can amd driver updates more or less fix it or is that already taken into account?
or is in a year or so time the only way out mining a different currency like Zcash and for those it seems that nvidia GPUs are just much better?

i just got an offer for Gigabyte RX 580 Aorus 4GB for 300€, the seller says it's a couple of months old.
is 4gb worth it? or should i avoid amd gpus with 4gb
or gtx 1060 3gb for around 250€
or 6gb for around 300€

so gtx 1060 3gb is a better buy than 6gb?

yea i want to mine Zcash with it, but some people were saying that when etherium dag file rises enough Zcash might also get a dag file and i don't want to face it with a 3gb card. otherwise i also think it's great for Zcash since it gets about 300 sol/s and uses less than 100W.
another thing. is a dual or even a triple fan gpu really necessary or is a small single fan gpu enough.

do you think 1060 3gb are gonna be able to mine for long? they are nearly 100€ cheaper than 6gb versions but hashrate is just a bit lower.
wanted to order a motherboard PSU and rx 580 from newegg, price:380€ would end up paying 540€ which makes it worse than just buying it from my own country.
amazon, ebay, everything is either out of stock or really expensive so i'm mostly looking for used stuff.
gtx 1060 3gb from 220€
6gb from 300€
1070 cheapest i could find is 400€
970 190€
rx cards sometimes there is a 4gb of 470 for 250€ but usually they all hang above 300€
now i've been throwing numbers into calculators for a while and i can profit usually from 5 months with proper tuning and on.
what do you guys think is it even worth it?

gtx 1060 3gb doesn't seem bad for Zcash, but after etherium dag file reaches a certain level zcash might have a dag file too so idk maybe 3gb just seem much.

oh yeah, that makes sense.
Thanks

thank you both. but does an old PCIe x16 reduce GPU performance. some say it does, i've seen fps tests that show the same. Is this comepletly up to a certain GPU?
i am now rethinking for a gtx970 as it goes for more than 100€ less than a gtx 1060gb. you think it's worth it?

i found some used HP PCs that have intel CPUs in them and some good HDD and SDD (i need that for my gaming PC). one of them is HP 8000 elite with a C2D E7500, 4GB DDR3 ram, some HDD and SSD and a useless PSU. What i'm worried is it's motherboard which is obviously very old and i'm not sure if it can run newer cards (like rx470 or gtx 1060) i think it's a Q45 mobo.

for now i just want to mine with one GPU (most likely a gtx 1060 6gb as Zcash seems very profitable right now)

and i don't care about the PSU and and the case, i'll get a new PSU and build my own case.

yea but i would go 2-3 GPUs since i don't have much money. if i want to upgrade later i can keep the GPUs put PSU in my gaming PC and sell the rest of the equipment for a bit of money. can mobo be limited how much VRAM can it take or are older mobos even compatible with something like an rx480 that has GDDR5 and is 8GB?

so i'm getting an rx card and a decent 450-650w PSU, but the rest of the system i'm thinking about buying a used and old PC, can any mobo power and read my GPU or are there any specific requirements? I'm aiming at total price of about 350€ with rx480 a bit more maybe.

yes but these are by far the chapest in my country. i haven't found any accurate sources comparing these two.

yea but which one 480 or 470. 470 comes at least 50€ cheaper but obviusly the mining performance is worse. with which one would i get faster ROI.

i am building a cheap mining rig and i have found a couple of offers.
 1. palit gtx 1070 super jetstream 390€
2. asus rx470 4gb strix 220€
3. sapphire rx480 8gb nitro+oc 260-280€(depends if the owner lowers the price)
4. i can also get a gtx970 for 190€ but i think rx or newer gtx cards are a better deal here.

i'm mainly looking here at rx480 and rx470 since they are quite cheap, but which one is better and what are avg. hashrates achiavable with these cards.

thanks!