ok.. so I've been thinking...  flat plate on cold water inlet vs. 2nd tank with sidearm heat exchanger...

I see the trade off as being:  with the flat plate method, you are only getting benifit while you are taking a shower.  Lets say the entire household totals 1 hour per day.  you get maximum effenciency/minimum price with the flat plate, but only for (1/24) = 4.1% of the time.. the other 95.9 percent, you are getting nothing. 

So the question is. how much heat are you recovering during that ~4% of the day?  after doing some research (yer geeks, you know how to use google..) I found that 1 Kilowatt/hr will heat 409 gallons 1 degree.  Lets assume you need a delta increas of 40 degrees.. so 1 Kilowatt/hr will cover approx 10 gallons.  assuming 2 gallons per minute on the shower, the question is:  does your water loop provide 1 kwh of heat energy every 5 minutes or less?  If yes, then you are golden with the flat plate setup. 

If not, then your water loop cannot keep up with your shower, and you need to extend the time where you are extracting heat.  To do this, it seems to me the best way would be to install a 2nd tank (cheap/new or used.. ) with a sidarm heat exchanger.  Put this inline with your hot water heater on the cold side instead of the flat-plate.  While this is the more expensive option, in the long run it should pay off as you will be actually be pre-heating all the shower water instead of just some.

If like me, your needed temp increase is closer to 60 degrees, then the calculations lean even further in the direction of 2nd tank.

Alternatively, you could just install water saving shower heads...  Ugg, I hate those things.

Sigg

OK, so will you even be offering Withdrawls as a service?  The recent Dwolla-delays are MTGOX are starting to really annoy me. 

thanks,
Sigg

I'm assuming part of what prompted the above is the current delays in Dwolla withdrawls.  To that end, can you comment on what kind of Dwolla backlog still exists?  If I were to request a Dwolla withdrawl today, when would it be processed?

thanks,
Sigg

has anyone tried/tested this on XP?

Sigg

how many of the pci-e x1 to x16 cable (v2) 26cm cables do you have left?  this is exactly what I'm looking for.

thanks,
Sigg

While I agree that having the market automatically set the price is best, I think the current implimentation is missing a piece.  Currently "the market" is defined as a contest between sellers.  The Buyers have no input here.  The buyers are presented with a "take it or leave it" price.  If a buyer was willing to by 10 million shares at .000048, there is no way for him to convey that information to "the market".   

As there is a 1 month backlog on processing purchases (I believe I've seen that mentioned on the forum here somewhere), there SHOULD be a price at which everyone gets shares all the time. (within the constraints of Pirate sack time).  If the current algo does not allow for that, then not only are sellers losing out on profits, but buyers are losing because they are having to wait longer for their purchases to process, and most importantly, GPUMAX is losing out because it isn't getting any fee for private shares.

Sigg

P.s.  STILL think GPUMAX is the best thing since sliced bread.  Since we are still in BETA, it seems to me like this is the time when such discussions should be taking place. 

DoubleGood Plus One

This alone would cut the post count on this thread in half.

Sigg

I'd be happy to set my lowest sell price and not muck with it if the price I got was the actual purchase price minus GPUMAX's (assumed) ~10% fee.   As it is, it appears that what we actually get when we sell is always the exact price we set as our "lowest" price.  So instead of "lowest" it is really "only".

I think it would be better to base the purchase price on buyer demand than have it calculated on seller's price.  Only the buyer's know where it is profitable to purchase, while for sellers, everyone knows we will most likely sell at anything above 101% PPS.  Yet it is up to us sellers to guess 1) what the buyers are willing to pay, and 2) are we not on public because there are no buyers? or are we not on public because GPUMAX isn't processing leases at the moment? 

Sellers are wanting to maximize their profits, under the current environment the only way for us to do that is to keep mucking with our sell prices to adjust to purchase price.  Unless you address my first point above, you will never see a situation where sellers will just set their lowest acceptable price and let it ride.

At the _VERY_ least.. a real time indicator of "now processing public shares" on the website would take some of the guesswork out of things for us. 

Now, having said all the above, I still think GPUMAX is the best thing since sliced bread..  I'm just trying to get some yummy jelly added to the mix

Sigg

Pirate,  is there any way we could convince you to disclose the pricing algorithm?  As stated above, my concern is that we are getting caught in a negative feedback loop.  If the algorithm never allows for 100% of sellers to be getting public work, the price is going to just keep dropping as those who are on the top end keep chasing public work by lowering their prices.  This will cause new sellers to be priced out, causing them to lower their price, causing new sellers to be priced out, etc, etc, ad infinitum.   

If this is the case, this isn't a free market situation.  There will be sellers willing to sell shares at a price buyers want to puchase shares, but they will never be allowed to meet due to systemic limitations.

Sigg

Hi all,

Does anyone know where you can buy "longer" PCIe 1x-16x or 16x-16x cables?  All the ones I can find on ebay / cablesrus are only about 20 cm long.  I'm looking for something about 40 cm.

I remember reading a post a while ago where a forum member had some longer ones for sale.  I've spent the last hour searching forums on here and can't seem to find it.  Hoping someone can point me in the right direction.

thanks,
Sigg.

I've played around with my ask price.  By adjusting the ask on as little as 5 Ghash, It is possible to see a noticable, though largely insignificant change in the purchase price.

Here's to hoping the new coming soon Pirate references above will materalize rather quickly. 

Sigg

This is why I really believe we are currently doing things backwards.  The pricing power should be turned over to the buyers.  Only they know where it is profitable for them to purchase shares.  Let them compete to purchase shares, and we would see near 100% utilization of public shares.   I'd much rather get 100% of .000045 than the current 10% of .00005.

Currently, if a miner sets a low minimum, they currently get _only_ that minimum, no matter what the actual sell price is.  While this is Great for Pirate, that leaves no incentive for a miner to set their price at anything less than .00005.

At the very least, let us set an absolute minimum, but give us the actual sell price minus a flat 10% fee.

And yes, I have set my measly 5 Ghash at many veried prices between .000035 and .00005 and never, afterwards, have I seen the purchase price at anything but .000055. 

Sigg

Really guys?  You're going to base your purchase decision on "can I fit 1 or 2 or 3 on a 15/20 amp circuit" ..??   We're talking $15,000 here .. If you have a doubt, bring in an electrician to run a dedicated circuit.

translation:  Holy crap are we having difficulty keeping the Rig cool.  Can't just add a fan to the bottom this time.  While we work on this, lets rip out half the cores and cut the price in half.

And YES, I'll be interested.  At 25K you were right at the bleeding edge of my avaliable funds.  At 30K I'm priced out.  At 15K (even for half the performance) I'll definately be buying one.

Sigg

less than 1/2 of 1 GPU equivelant.   These things are used a lot for salt-water fish tanks.. they are very efficient pumps. 

Sigg

As a seller, I could whole-heartedly get behind this.  Currently, we miners have to essentially guess what price is profitable for the purchasers.  As what they do is voodoo to us, this makes things a tad difficult.  (Lets face it, if we knew exactly what they were doing, we wouldn't be selling them our shares, we'd be using them ourselves.)

As a miner, I'll sell my shares to whoever wants to pay the most (as long as its over 100% PPS).  Let the buyers compete, and I'm sure we'd quickly reach an equilibrium where no share went unsold.

Let the buyer who bids the highest get moved to the front of the queue.

Sigg

I've noticed that avaliable lease work has been light for the past week or so.  I'm wondering if the fixed lease price for purchasers may need to be adjusted down a bit to accomidate the current difficulty?

Sigg

Umm.. unless you are mining at a dedicated mining facility, you shouldn't add in the delivery/trans/admin/other costs if they are fixed*.  If you are mining at home, you'd be paying those anyway.  Marginal cost would only be 0.069/kWh.

* If they are not fixed, but variable charges based on kWh usage, then ignore the above. You do, however, need to go down to your electric co and slap around someone for making your bill more confusing

Sigg

to clarify, I think 60-70% have an electrical cost <50% of their current revenue.  If network hashrate is 10 Thash before halving, I expect it to be 6-7 Thash after halving.

Sigg

I'm expecting network hashrate to start dropping 2-3 weeks before the halving.  Marginal GPU miners will want to balance "mining to the bitter end", with, "beating the rush to sell GPU's on ebay"  After the halving, you will see an instant drop to 60-70% of pre-halving hashrate as the rest of the marginal miners do the math and figure out they aren't paying the electric bills anymore. 

Give it a month or 2 for difficulty to come in line with the new hash-availabily reality, and the end result will be that mining income per Ghash will be worth about 80% of what it was before. (I'm guessing around $2 per day per Ghash) 

If any, the halving will only cause a very small increase in the price of BTC.

This assumes we aren't in the middle of a bubble come halving-day.  If thats the case, yer gonna have to start looking at tea leaves and chicken entrails to get a feel for where we're headed.

Sigg