_ Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top up vote 8 down vote favorite 4 My friend asked me to do a research for him on bitcoin mining, I don't know a lot so I'm asking.He's consider buying either NVIDIA gtx titan or NVIDIA gtc 980.Decent motherboard and internet speed.I stumbled upon a question on this site which says that Gpu and Cpu mining is over, it's all about ASIC now, but we can't afford ASIC.All in USA, we're living in Lebanon Overly expensive and we didn't count shipping costs Now I want you to consider Internet is free Electricity is free Other than buying the hardware, we have no expenses at all My question now is the following: In best case scenario, using NVIDIA gtx titan or NVIDIA gtc 980, how much bitcoin can we expect to mine?(unless it's really dead) Is it wise to buy NVIDIA gtx titan or NVIDIA gtc 980 to mine bitcoins if you don't pay taxes?

Would it pay off?mining-profitability gpu-mining up vote 8 down vote Thanks for asking this question.I see a lot of people all the time who assume GPU mining is profitable.Try googling "bitcoin mining calculator" and see.bitcoin backup blockchainPresently (in 2015) the calculator will tell you that you would be able to mine one bitcoin in about 1000 to 10 000 years.bitcoin cotação realBut you have to consider that there are reward halvings every four years, which those calculators don't take into account.bitcoin reitA more realistic scenario then is that it would take over a million years to mine one bitcoin.dogecoin dollarOf course you don't have to mine a whole bitcoin.bitcoin ouro

If you are lucky you could perhaps mine 0.01 BTC in 10 000 years.That's worth a little over three US dollars at the time I write this.There are still a few people mining on GPU or even CPU.Some of them may have free electricity.But what they fail to understand is how extremely slow this is.ethereum frameMost ditch GPU/CPU mining when they see that you'd be lucky to earn three dollars in 10 000 years.But there are still some (in my mining pool) who refuse to give up.TL;DR: no, GPU mining is not viable.up vote 2 down vote GPU's are horribly inefficient compared to ASIC's.Consider that the absolute best GPU's get around 1 GH/s and cost in the $400 range.An Antminer U2 costs around $20 on ebay and gets 2 GH/s.Antminer U3 costs around $60 and gets 60 GH/s.Roughly speaking at current network hash rates and current bitcoin price, if you get electricity for free, you can make back the hardware costs of an Antminer U3 in about a year.

Of course, if the hash rate goes up, it'll take longer and if the bitcoin price goes up, it'll take shorter.Basically, go get a cheap miner from ebay or somewhere.up vote 2 down vote I'd say that with free electricity GPU mining can be worth it in some ways.Rushing out and buying cards to build a GPU miner no longer makes sense, but with free electricity using a computer you primarily have for gaming to mine when you're not gaming will generate a tiny amount of profit.Another potential advantage is that if you live somewhere cold then the heat mining generates isn't a waste product.However, any profitability goes out the window if you overdo it and melt your new graphics card, there's no way you'll earn enough to replace it.Mining makes your GPU very hot, so if you've overclocked it you could easily destroy it.It also wears out the cooling fans, you won't even earn the price of a new fan so is it really worth it?Of course if curiosity rather than profit is your motive then why not?

You'll soon get sick of the noise your computer's fans make though.I myself decided to call time on GPU mining bitcoin when the mining difficulty went up to 12,000,000 as it was no longer worth it, today the mining difficulty is 178,678,307,672, almost 15000 times higher and each block is worth less too due to halving.protected by Community Thank you for your interest in this question.Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).Would you like to answer one of these unanswered questions instead?Browse other questions tagged mining-profitability gpu-mining or ask your own question.If you typically follow GPU performance as it related to gaming but have become curious about Bitcoin mining, you’ve probably noticed and been surprised by the fact that AMD GPUs are the uncontested performance leaders in the market.This is in stark contrast to the PC graphics business, where AMD’s HD 7000 series has been playing a defensive game against Nvidia’s GK104 / GeForce 600 family of products.

In Bitcoin mining, the situation is almost completely reversed — the Radeon 7970 is capable of 550MHash/second, while the GTX 680 is roughly 1/5 as fast.There’s an article at the Bitcoin Wiki that attempts to explain the difference, but the original piece was written in 2010-2011 and hasn’t been updated since.It refers to Fermi and AMD’s VLIW architectures and implies that AMD’s better performance is due to having far more shader cores than the equivalent Nvidia cards.This isn’t quite accurate, and it doesn’t explain why the GTX 680 is actually slower than the GTX 580 at BTC mining, despite having far more cores.This article is going to explain the difference, address whether or not better CUDA miners would dramatically shift the performance delta between AMD and Nvidia, and touch on whether or not Nvidia’s GPGPU performance is generally comparable to AMD’s these days.Topics not discussed here include:These are important questions, but they’re not the focus of this article.

We will discuss power efficiency and Mhash/watt to an extent, because these factors have an impact on comparing the mining performance of AMD vs.Nvidia.Bitcoin mining is a specific implementation of the SHA2-256 algorithm.One of the reasons AMD cards excel at mining is because the company’s GPU’s have a number of features that enhance their integer performance.This is actually something of an oddity; GPU workloads have historically been floating-point heavy because textures are stored in half (FP16) or full (FP32) precision.The issue is made more confusing by the fact that when Nvidia started pushing CUDA, it emphasized password cracking as a major strength of its cards.It’s true that GeForce GPUs, starting with G80, offered significantly higher cryptographic performance than CPUs — but AMD’s hardware now blows Nvidia’s out of the water.The first reason AMD cards outperform their Nvidia counterparts in BTC mining (and the current Bitcoin entry does cover this) is because the SHA-256 algorithm utilizes a 32-bit integer right rotate operation.

This means that the integer value is shifted (explanation here), but the missing bits are then re-attached to the value.In a right rotation, bits that fall off the right are reattached at the left.AMD GPUs can do this operation in a single step.Prior to the  launch of the GTX Titan, Nvidia GPUs required three steps — two shifts and an add.We say “prior to Titan,” because one of the features Nvidia introduced with Compute Capability 3.5 (only supported on the GTX Titan and the Tesla K20/K20X) is a funnel shifter.The funnel shifter can combine operations, shrinking the 3-cycle penalty Nvidia significantly.We’ll look at how much performance improves momentarily, because this isn’t GK110’s only improvement over GK104.GK110 is also capable of up to 64 32-bit integer shifts per SMX (Titan has 14 SMX’s).GK104, in contrast, could only handle 32 integer shifts per SMX, and had just eight SMX blocks.We’ve highlighted the 32-bit integer shift capability difference between CC 3.0 and CC 3.5.AMD plays things close to the chest when it comes to Graphics Core Next’s (GCN) 32-bit integer capabilities, but the company has confirmed that GCN executes INT32 code at the same rate as double-precision floating point.