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Re: [XPM] [ANN] Primecoin Release - First Scientific Computing Cryptocurrency
Those primes are large, not astronomically large as Mersenne primes of course, but there is no such thing as a 'prime table' that you can look it up at this scale, as primes are abundant.
Yes, but clearly it takes less computing power to 'look up' a prime than to use the client software to create it then to check if it is part of a chain.
If you have created a client that can manufacture primes then it is easy to use the client to manufacture them and then store them in a database for analysis.
I am pretty sure that there is such a thing as a 'prime table'. It is a database of known primes.
http://primes.utm.edu/primes/search.php
I am currently investigating this issue among others.
I have one general question regarding my desktop system. I realized the 7970 is a brand new GPU from AMD, and there are only a few cards different from the reference design. I would not have a problem with that, but would those of you who have more experience recommend waiting for other/better models to come out? The reference design already features the cooling system of my choice (blowing out of the case), so I don't know what else could be improved in later versions. Sorry for this being slightly off-topic, I'm still waiting for my actual $/kWh and meanwhile would like to make my desktop profitable. Thank you!
Thanks for your reply. I am not sure about those four 5850s being cheaper than two 5970. They seem to be pretty equal, at least here in Germany (used ones of course). Do you mean 120 bucks for the power per month?
Regarding the 7970, I don't understand why you'd say it would not work. Sure, I did use the calculator, but as I would sell my old GTX 580, I would not spend more than $200 extra. IF I calculated them in, the break even would be in about a year. But as I need this card (or any other high-end card) anyways, I would just not calculate it in. That way I would make profit, even though it's not much. Best case 0.5 BTC per day, according to you at least 0.25 BTC per day (using the .28 USD).
Regarding the rig: Let's first see what I actually have to pay per kWh. I'll keep you posted.
Regarding the 7970, I don't understand why you'd say it would not work. Sure, I did use the calculator, but as I would sell my old GTX 580, I would not spend more than $200 extra. IF I calculated them in, the break even would be in about a year. But as I need this card (or any other high-end card) anyways, I would just not calculate it in. That way I would make profit, even though it's not much. Best case 0.5 BTC per day, according to you at least 0.25 BTC per day (using the .28 USD).
Regarding the rig: Let's first see what I actually have to pay per kWh. I'll keep you posted.
Okay, my landlord didn't know the exact price himself. He will let me know after looking into it.
Meanwhile I realized, that I could just swap my GTX 580 with a new AMD 7970 and easily make .5 Bitcoins a day, even if I would have the worst possible electricity prices. That way my desktop PC (which is running 24/7 anyways) would generate a little money, and the card would do just as good for gaming. Downside would be the crappy Linux drivers from AMD. I know there is progress, blabla, takes too long.
And after I know the exact prices, I will look into getting those 5970s and build a rig (after all calculation is done).
BTW, 250W seems to be the idle power consumption of the GTX 580. They state a stunning 350W under heavy load. The same goes for the 7970...
Thank you also for the suggestion with with solar power. Indeed there is a similar thing going on in Germany. I believe it's running out anytime soon, so Solar Power companies are having a harsh time over here. I don't have any option to make use of this, even though it's common practice over here.
Regarding the heat: I currently am more than happy to use my PC as alternative heating source, as the pipes that transfer the water in the heating seem to be insulated really bad. That way the produced heat is not just waste, but a welcome side-effect to keep my room at a comfortable temperature.
I think I won't like this in summer though...
Meanwhile I realized, that I could just swap my GTX 580 with a new AMD 7970 and easily make .5 Bitcoins a day, even if I would have the worst possible electricity prices. That way my desktop PC (which is running 24/7 anyways) would generate a little money, and the card would do just as good for gaming. Downside would be the crappy Linux drivers from AMD. I know there is progress, blabla, takes too long.
And after I know the exact prices, I will look into getting those 5970s and build a rig (after all calculation is done).
BTW, 250W seems to be the idle power consumption of the GTX 580. They state a stunning 350W under heavy load. The same goes for the 7970...
Thank you also for the suggestion with with solar power. Indeed there is a similar thing going on in Germany. I believe it's running out anytime soon, so Solar Power companies are having a harsh time over here. I don't have any option to make use of this, even though it's common practice over here.
Regarding the heat: I currently am more than happy to use my PC as alternative heating source, as the pipes that transfer the water in the heating seem to be insulated really bad. That way the produced heat is not just waste, but a welcome side-effect to keep my room at a comfortable temperature.
I think I won't like this in summer though...
Thank you, I will calculate that when I got my bill. In the meantime I checked various prices and it seems I can't get any offer lower than 0.20 USD per kWh. Assuming 0.28 USD per kWh (which is more likely) I would definitely loose money by mining (right now). 
In Slovakia: 8 eurocents/kWh, year-round. In the night it can be 5.5 cents (if I had it enabled). I am mining right now only because it helps with heating, when it gets warmer, i will stop.
Hahaha, I'm doing the same thing, it's pretty cold here too. I hope you don't have financial issues getting your house warm though.
GL bro!But according to the wiki, the FPGA hardware is so expensive, that I could barely make it to 200 Mhashes/s with my budget. So it would be smarter to just let my desktop PC do the job, with ~150MHashes/s (I tweaked it a bit). My computer runs 24/7 anyways, so the power consumption might be slightly higher, but yeah. It actually could pay the higher energy costs and maybe make a little extra, given the fact I didn't pay anything for it (in terms of mining, I bought it for personal use, so no break even to reach).
The second issue with FPGA is: It's really not usable for anything else but mining (at least for me). If the difficulty goes further up, making it impossible to mine (in terms of sanity), I'd have an expensive brick. On the other hand I could still sell those Radeons on eBay.
Where do you live?
I think I need to move, or as my former company if I could put it somewhere.
The second issue with FPGA is: It's really not usable for anything else but mining (at least for me). If the difficulty goes further up, making it impossible to mine (in terms of sanity), I'd have an expensive brick. On the other hand I could still sell those Radeons on eBay.
I pay $0.105/KWh...that includes electricity, delivery costs, taxes and anything else that may get added on.
Where do you live?
I think I need to move, or as my former company if I could put it somewhere.
You're probably right, but leaving the Bitcoins at the pool didn't seem that bright either. I'm new to this, so I actually did what anyone would do: Leave it at default settings, automatic transfer of > 0.01 BCs.
It is very unlikely the costs will be lower than $0.20. I live in Germany, enough said.
I'll check the prices and then reconsider the investment. I'd be so sad if it didn't work out. Maybe if all you guys quit mining, the difficulty would go down far enough for me to make profit? GO!
It is very unlikely the costs will be lower than $0.20. I live in Germany, enough said.
I'll check the prices and then reconsider the investment. I'd be so sad if it didn't work out. Maybe if all you guys quit mining, the difficulty would go down far enough for me to make profit? GO!
Thank you for your quick replies! I think I will give it a try. The $0.28/kWh are just estimated, as I honestly don't know what I (will pay). I should probably ask for a bill from my landlord (what a strange word).
Will those two 5970's have to be from the same vendor (for cross-fire)? It seems hard to find two cheap, used units from the same vendor.
One general question, if you don't mind: I also read in some other threads about using USB flashdrives for those rigs. Are they used instead of a hdd? Or are they used to store the wallet? If used for both, isn't it very risky to use them, as they have limited reading/writing capabilities (hence data loss after using it for a while).
I think FPGAs are not what I search, the GPUs may still be sold to other miners/gamers or used for rendering. And imho the costs for getting a decent Mhash/s rate on FPGAs seems pretty unrealistic.
Another question, just happened: I received a payment to my local wallet for mining, but in my Bitcoin wallet the address disappeared. I think it's not supposed to disappear, is it? I should be able to receive unlimited transactions on one address. What happened? 
nvm, I got it all wrong.
Will those two 5970's have to be from the same vendor (for cross-fire)? It seems hard to find two cheap, used units from the same vendor.
One general question, if you don't mind: I also read in some other threads about using USB flashdrives for those rigs. Are they used instead of a hdd? Or are they used to store the wallet? If used for both, isn't it very risky to use them, as they have limited reading/writing capabilities (hence data loss after using it for a while).
I think FPGAs are not what I search, the GPUs may still be sold to other miners/gamers or used for rendering. And imho the costs for getting a decent Mhash/s rate on FPGAs seems pretty unrealistic.
Hi,
I recently discovered Bitcoins (too late ) and I started mining with my GTX 580. No need to say that it is kind of useless for this purpose. Now I was thinking about building a rig exclusively for mining. The reason I seek your help is, that all the hardware related information found on the web seems either slighlty outdated (mid 2011) or very vague. I am no expert on hardware, so I would be glad about any suggestions. I'd like the rig to pay for itself and after a year or so make some profit (even with the high difficulty, I guess it's not going done anytime soon). I am willing to spend up to 1000 USD, probably going to look for used parts as well. I think I currently pay 0.28 USD/kWh, don't know if this expensive though. 
If you have an up-to-date guide on hardware, and I was too ignorant to find it, please point in its direction. Also, I'd like to have it really powerful, not just 300 Mhash/s or something, more like 2-3 Ghash/s.
Whatever is possible with the circumstances I described.
Thank you!
I recently discovered Bitcoins (too late
) and I started mining with my GTX 580. No need to say that it is kind of useless for this purpose. Now I was thinking about building a rig exclusively for mining. The reason I seek your help is, that all the hardware related information found on the web seems either slighlty outdated (mid 2011) or very vague. I am no expert on hardware, so I would be glad about any suggestions. I'd like the rig to pay for itself and after a year or so make some profit (even with the high difficulty, I guess it's not going done anytime soon). I am willing to spend up to 1000 USD, probably going to look for used parts as well. I think I currently pay 0.28 USD/kWh, don't know if this expensive though. If you have an up-to-date guide on hardware, and I was too ignorant to find it, please point in its direction. Also, I'd like to have it really powerful, not just 300 Mhash/s or something, more like 2-3 Ghash/s.
Whatever is possible with the circumstances I described. Thank you!