Buying GPUs, need an opinion

[Calatravo]

Hi guys
Im thinking of buying some 1070s but today i saw that the 1080 wouldnt be much more expensive so i checked on what to mine whats about the profit. They give me a better Prof about 50%! I read about that the are not that eficient in mining ether or zcash because of gddrx?!? but on "whattomine" it says its just like the Prof of the 1070.
So i habe some questions:
How are the profits on whattomine calculated (overclocked etc?) ?
Anybody running some 1080s and what algo with?
What would you recommend to buy? 1070 are just about 50 cheaper.

THX a lot! Sry for my Bad english and im Kind of noobie

Calatravo

[QuintLeo]

GTX 1080 is lower hashrate than GTX 1070 on ETH, but somewhat better on everything else I've seen.
 For Skein Groetsl and the ZEC algo in particular, it's about 15-20% higher hashrate than a GTX 1070 if they are set to similar "OC vs a Founder's Edition" settings.

 Whattomine assigns hashrates arbitrarily, sometimes they are "reasonable" sometimes they are quite a bit off, and OC/UC/UV/TDP settings will affect that a LOT anyway.
 Nothing they can do about that, given how wide a range of hashrates the SAME CARD (much less the same GPU in different cards) will demonstrate depending on settings and luck in the Silicon Lottery.
 They do seem to assume "modded BIOS" cards on the AMD side, and some OC from most of the hashrates I've seen them use.

 It's a useful site, but you need to know what YOUR cards will manage for it to be a good comparison site.

[Jating]

GTX 1080 is lower hashrate than GTX 1070 on ETH, but somewhat better on everything else I've seen.
 For Skein Groetsl and the ZEC algo in particular, it's about 15-20% higher hashrate than a GTX 1070 if they are set to similar "OC vs a Founder's Edition" settings.

 Whattomine assigns hashrates arbitrarily, sometimes they are "reasonable" sometimes they are quite a bit off, and OC/UC/UV/TDP settings will affect that a LOT anyway.
 Nothing they can do about that, given how wide a range of hashrates the SAME CARD (much less the same GPU in different cards) will demonstrate depending on settings and luck in the Silicon Lottery.
 They do seem to assume "modded BIOS" cards on the AMD side, and some OC from most of the hashrates I've seen them use.

 It's a useful site, but you need to know what YOUR cards will manage for it to be a good comparison site.

I just use the 1080 for ZEC. It is much better there.

[SubZer0]

I am building on ASUS Z270A, i wanted to begin with 2 1070's and than expand.
Will it work good if i start with one 1080ti and 2 1070's? Will they work good combined?

[btcgolong]

Lol, i was confused with the 1080ti's with the other memory.
Yes i know 1070's can do a lot more than 1080's.
But i thought the AMD cards could mine way better and efficient in other coins.. or am i wrong lol

AMD cards are more efficient at certain algorithms, and Nvidia more efficient in others.  They can both mine practically all the same coins that matter though.  When cards were available, the RX470 was the sweet spot for Etherium when it came to price per Megahash.  An nvidia 1070 is the current sweet spot for cards that are available.  A plain 1080 is not a good value at today's prices, and a 1080ti is a powerful card when you put it on the algos that nvidia does best.

Great post, thanks for the info...but I don't know where he is getting the RX 580, that card is impossible to find (esp. at a far price).