I just fixed my car AC the other day, super simple, a can of r134a and I got cold air right away. Why there is still no AC case (or even AC cooling set for cpu/gpu/vrm) available? Is it regulated? I only find one similar case using semiconductor material and it lowered the case temperature by a miserable 3 degree...

Reduce your risk by selling maximum 2 at a time

Well, this is one of the debate: In a centralized system, security can be controlled by a few authorities, while in a distributed system, security in principle should be controlled by the mass people

So, if spam/virus can be eleminated using a p2p network, then wallet will be safe enough, how to implement this technically? Through forum? 

Worldwide instant and secure payment, this is by far the best character of bitcoin

There are issues need to be improved, currently it can only be used by experienced IT people

People have to learn lots of things before they can use bitcoin, so I think it will not become a widely accepted payment method, but rather suit a fraction of the people, like SDR mostly used between IMF members

I think the most interesting character of the bitcoin is its scarcity. In today's world, almost everything can be produced limitless, there are enough advanced technology to be used to produce anything. But bitcoin put a limitation on the availability, this design makes it very unique

Of course there are something that can not be produced limitless: time and job. Time, job and bitcoin, maybe they share some thing deep inside

"Investment" this word never exist in the bitcoin world, since bitcoin itself is the biggest investment

In an inflationed economy, currency continuously drop in value, pushing those who have the currency to invest, otherwise their fortune will be destroyed day by day

In an deflationed economy, unless each one has hoarded enough currency, they will not start to investment/spend

I think currently we are just at the beginning of the hoarding phase

Looks great, how that smells? 

It may not handle the heat of 4+ cards, and the heat will raise the temp in the room, either radiator has to be put outside the room or the whole machine has to be put in a cold environment

I just tried yesterday on one of the 5870 cards to use a simple GPU block to water cool the GPU and use RAM sinks and a big low rpm fan to cool the VRM

But there are problems: After one hour, the radiator of the water cooling device start to get hot, and GPU temp rise from 40 degree to 53 degree, means the water temp at least rised by 13 degree.

This is only one GPU, if 2-3 GPU burns at the same time, I'm afraid the radiator will not be cool enough to keep the GPU temp down. Another problem is the VRM temps got really high (80+) and are at least 20 degree higher than the stock fan cooler, seems the only way to cool the VRM correct is to install a customized VRM sink like those from vf3000a

After this experiment, I simply installed back the stock cooler and try to tolerate the noise instead. I think the best way is to put the whole machine in the balcony (less than 25 degree most of the time, minus 10 during winter), but that will put lots of requirement on the casing design

Is there any one using watercooling here, how many cards a watercooling device can handle? Any other solutions which works better?

Is it true? I just plan to install a windows xp with only 1GB ram for 3 cards, what could that be?

As I understand, linux will be the better choice, gives better h/s. With windows xp, I have to make dummy DVI plugs and using VNC might not always be fast

But when it comes to OC, fan control, temp monitoring etc, I don't know how much function linux can provide? And Guiminer is really easy to use and switch between different profiles

Any recommendations?

Thanks for the explaination

Another aspect I'm guessing: The finding of a block is just a race towards the target, as soon as the target is found, another round of race will start. So if a small pool can not find the block in it's first attempt, then later he will always be slower than the big pool, given that they are using the same scan sequence to find the block

Is this ture?

For example, a pool with 2000GH/s speed maybe calculate out a block in 10 minutes, while a small pool with 20GH/s may take days to calculate out a block

In this case, I just don't see any chance with a small pool since each block will always be found out first by the fastest pool and it's obvious that everyone will run into the biggest pool

Do I understand right?

It just seems very difficult for bitcoin to become a widely accepted currency, but it maybe much easier to become a great investment instrument and everybody's retire fund will be stored in it in the future

Housing used to play such kind of role, but it busted: It is still something that is tangible, people lost interest after getting it. Now it shifting to gold, but due to unknow produce power of the gold, difficult to say how long it can hold people's interest

OK, that could be TURE, I remember there is a theory saying that people will spend more when they FEEL they are getting richer (because of the rising value of their asset). And people will spend less when their asset is devaluating

And that could still be part of the picture, this only applies to those already have enough bitcoin, so that small amount of spending does not hurt their saving. It could indicate that there were many guys holding lots of bitcoins because of the hoarding during the early days, without hoarding happened at the first stage, this phenomenom might not be observed




 

That's part of the picture, current system consists mostly non-business driven speculative transactions, and these kind of transaction always goes up when the price is rising (And when price crashes suddenly), could be different when the bitcoin really replaced credit card.

I believe this is temporary, given the nature of bitcoin supply is very limited

That's a good point, and that is also true for USD, as long as much of the USD is put into speculation, FEB must keep printing more money.

By classical econonic models, bitcoin has lots of weakness and is still very unmature, but if we are planning the future with a worldwide currency, every existing rules could be changed given good implementation

About the defaltion spiral topic, the human nature of thinking is: If this thing is going up in value, I'm going to hold to it and wait until it gets more valuable

So, in order to counter this kind of thinking, there could be a devaluate design, say if you hold a BTC for more than 3 month, it will disappear

In tradional economy, each money is same, but in bitcoin world, each coin is not the same. So maybe there is a way to get more coin into exchange everyday, a mechanism to encourage people spend those coins, e.g. the exchanged coin goes up in value, while those not used coin will disappear one by one

A currency is of no use if it is not used to spend/investment, it should never be a way to save for the future, for each saved currency, there is corresponding reduced spending power thus bring unefficiency to economy, I have a very simple example can prove this

By classical econonic models, bitcoin has lots of weakness and is still very unmature, but if we are planning the future with a worldwide currency, every existing rules could be changed given good implementation

wealth is not labor, it is desire, the more desire, the more wealth

This could be the bubble for the next 10 years, maybe 10 times bigger than housing bubble(measured in USD)!

Another problem is the rising difficulty each month, soon it will be only 0.1 BTC even on a machine with 1Ghash power, unless BTC rise in value quickly, I don't see a bright future

Anyway this is fun, I just bought a second hand 5870 which now runs 400Mh/s and testing

I don't really understand

Is this mean, if I measured 500W at the wall, the PSU only output 400W to supply the whole machine?