Scrypt ASIC vs. GPU RIG: What's the most profitable and durable ?

[GanjaPowered]

Hi miners !

There is two months ago, I started to be obsessed by the cryptocurrencies world  
For a first experience, I buyed a Zeusminer Blizzard (Scrypt 1.5 Mh/s) but today I'm asking myself on the power rentability so I did some searches:

• Scrypt ASIC mining is power efficient and cheap regarding the hashrate it offers
• GPU only coins are much more profitable, and RIGs offers the best coins choices

Energy costs in France (EDF):

Low cost period: 0.0623 €/kWh
High cost period: 0.1019 €/kWh        

GPU RIG

I made this "cheap" R9 based config:

• Motherboard: ASRock H81 Pro BTC (PCI-E x5): 54.95 €
• CPU: Intel Celeron G1840 : 44.75€
• RAM: Crucial Ballistix Sport 4Go DDR3 : 25.35€
• GPU: 3x AMD Radeon Sapphire R9 290 Tri-X (Used) : ~600€
• SSD: Corsair Force Series LS 60 Go : 41.95€
• Power Supply: Be Quiet ! Power Zone 1000W 80PLUS Bronze : 184.95€

Total: 951.95 € = 1 095.62 $
Litecoin average hashrate: 3 x 800 kH/s = ~ 2.4 MH/s = 16.41 LTC / Year = 0.13 BTC / Year
Monero average hashrate: 3 x 700 H/s = ~ 2.1 kH/s = 561.15 XMR / Year = 1.209 BTC / Year
Power consumption: ~1kWh => ~ 130€ / Year

Scrypt ASIC

From the same range of price, I found the Zeusminer LIGHTNING X6 + 1200W PSU (both used)

Total: 1 100 € = 1 238.21 $
Litecoin average hashrate: ~ 42 MH/s = 287.17 LTC / Year = 2.29 BTC / Year
Power consumption: ~1kWh => ~ 130€ / Year

To conclude

What do you think about my calculations ?
Do you think it is preferable to mine Scrypt with ASIC with a huge hashrate, or is it better to build a GPU RIG because GPU/CPU only coins are more profitable ?

Thanks for your help !
And sorry for my english  

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[bathrobehero]

GPU rigs you can use for other purposes and can resell in a few years but ASICs will just become heavy door stops.

[GanjaPowered]

What do you mean by "become heavy door stops" ?

[Eliovp]

What do you mean by "become heavy door stops" ?

Worthless..

Why those 290's? Those are power eaters..

[GanjaPowered]

What do you mean by "become heavy door stops" ?

Worthless..

Why those 290's? Those are power eaters..

The 290 provides nice hashrates
That's right 7950 have a better power consumption, but I would need 2x more GPU  

I will deepen my searches on GPUs  
(Your website in your signature is very interesting  )

[bathrobehero]

What do you mean by "become heavy door stops" ?

A 290 or whatever GPU will still be valuable for gamers in a few years. In contrast, nobody ever buys inefficient ASICs because they are a waste of both money and electricity.

[QuintLeo]

Scrypt is NOT mineable at a profit with any GPU, nor has it been so for over 2 years - unless you have free electric.

 Even with VERY VERY cheap electric, first-generation ASIC like the Gridseed GC3355 based miners or stuff like the Zeus isn't profitable any more or is very very marginal on profit.

 About the only profitable (with average electric cost) Scypt miners are the Innosilicon A2-based gear, the Alcheminer and it's variations, and the KnC Titan (if they work long enough, their reiability even at the chip level is poor though most that are still working at all by now SHOULD keep working a while).


 For comparison, my Mega Terminator A2s hash at about 110 Mh/s while eating about 1250 watts (appx, varies about 50 watts with the specific miner due to manufacturing variation and variation in the power supplies in each one) in max turbo mode (1200 Mhz clock).

 They do a little over 90 Mhs each at a little less than 1000 watts in non-turbo mode (1000 Mhz clock).
 
 Their software changes the voltage to the chips depending on the clock rate, thus the change in efficiency.

 Watts measured at the wall on a Brand wattmeter, not estimates but actual. Some of my A2s appear to have the original "factory" power supplies in them with no markings on the PS, 2 have Seasonic X1250 transplant power supplies, one has some off-brand Chinese "1300 watt gold" PS (came that way from Zoomhash, works so I left it alone).


 You do the math - the Alcheminer is about double the hashrate for about double the power (very similar efficiency to a non-turbo A2 a hair better than A2 in max turbo), the Titan is somewhat more efficient, and ALL of the blow away those Zeus units you were looking at much less ANY GPU-based rig.


 Back in the day when GPUs were useable for Scrypt, the best price-performance point was at the 7950 as I recall. Hash per watt was pretty much the same across the board on most of the 7xxx series, most of the 2xx series were re-badged 7xxx series though at least one of the top-end 2xx series cards was new and "bigger" than the 7xxx series ever got to - but hash/watt was still pretty much the same.

[asevereyn]

GPU rig its better because you can mine a lots algos ethereum, zcash, monero, and use a new generation of GPU, R9 or RX less power consuption

[_ZET_]

GPU mining rigs all the way, flexibility of that configuration is simply enormous.