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Bitcoin Discussion Thread

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Whatever ended up happening to Slush's pool this morning (DDoS or whatever that caused the issues with connection) seems to have caused my rewards to double triple or (rarely) quadruple. Granted i went from .002-.003 per block to .005-.008 per block, but its a significant increase for me!

What I'm NOT sure on, is whether or not the frequency of block finding has changed, I'd assume so since the pool was at 1.5Th/s yesterday and is at ~800Gh/s now. So it's probably a wash, but I can dream, eh?
 
crazjayz said:
What's the slowest cpu that would be able to handle dual gpu or quad gpu (6990x2) mining? I have a s939 4400+ at 2.2Ghz (stock clocks) with two PCI-e slots in the mobo. If I throw dual 6990s, would I see a detriment in Mhash compared to a more modern system?

I guess what I'm asking is if a 4400+ enough to run a mining server?
Click to expand...

shouldn't be a problem, cpu power doesn't figure into it much...
 
crazjayz said:
What's the slowest cpu that would be able to handle dual gpu or quad gpu (6990x2) mining? I have a s939 4400+ at 2.2Ghz (stock clocks) with two PCI-e slots in the mobo. If I throw dual 6990s, would I see a detriment in Mhash compared to a more modern system?

I guess what I'm asking is if a 4400+ enough to run a mining server?
Click to expand...

CPU speed makes no difference in gpu mining. I'm doing multiple 1.2K+ GHash/sec on nothing more then a sempron cpus.
 
wol-va-rine said:
namecoin difficulty just quintupled from what I heard...

3,000+ to 15,000+
Click to expand...
Yikes, it was at 3767 yesterday! Now it is at 15071! To be honest, it had to go up sooner or later, sub 10k difficulty gives up too many coins! But still far lower difficulty then 567358 difficulty of Bitcoin!

Probably explains why the NMC exchange rate doubled as well. It is still more efficient to mine NMC until the NMC exchange rate drops.

I mine with http://bitparking.com and exchange NMC to BTC on http://exchange.bitparking.com Have not had any issues with them, so haven't looked for any other Namecoin pools.

Also, you can find the current Namecoin difficulty level on http://namecoin.us under Tools.
 
I finally got my 6950 in. I overclocked it to 900mhz core and am getting around 380 MH/s with stock shaders. I have a 6850 and 5830 coming in this week as well. Bring on the BTC!
 
I have a Sempron 140 feeding a 6850 right now @ around 245MH/sec and I'm going to use my other Sempron 140 to feed my 2 5830s after I figure out where I put the damn thing and the cards arrive.
 
It appears that Deepbit is down again. Of course it happens right after I get my 6950 set up.
 
wol-va-rine said:
IDK, but I'd guess yes, even most folding rigs I've seen pics of are hardwired...
Click to expand...

Seems to be quite finicky, sometimes it will stay running fine other times it will just lose connection every minute for a few seconds over and over. In hindsight I should've spent the extra for the powerline ethernet having had to switch to wireless due to "aesthetic" reasons.

InvisiBill said:
Yeah, RDP does weird things with the video driver. I use TightVNC to connect to my other box.
Click to expand...

I've been using TightVNC and RDP. Although now that you bring it up, this does explain why RDP works funny sometimes, although I'm pretty sure I've gotten it to start sometimes.
 
NobleX13 said:
It appears that Deepbit is down again. Of course it happens right after I get my 6950 set up.
Click to expand...

EDIT: Back up. It's my rig that's down, and I am at work... :( My overclock must need some additional volts.

Or the power's out.

Or my house is burning down!! :mad:
 
hrm....

E:\namecoin>namecoind getinfo
{
"version" : 32150,
"balance" : 66.52505637,
"blocks" : 12069,
"connections" : 8,
"proxy" : "",
"generate" : false,
"genproclimit" : -1,
"difficulty" : 3767.78158122,
"hashespersec" : 0,
"testnet" : false,
"keypoololdest" : 1307905113,
"paytxfee" : 0.00000000,
"errors" : ""
}


E:\namecoin>namecoind getinfo
{
"version" : 32150,
"balance" : 66.52505637,
"blocks" : 12119,
"connections" : 8,
"proxy" : "",
"generate" : false,
"genproclimit" : -1,
"difficulty" : 15071.20565385,
"hashespersec" : 0,
"testnet" : false,
"keypoololdest" : 1307905113,
"paytxfee" : 0.00000000,
"errors" : ""
}

bummer
 
sethmo said:
Yikes, it was at 3767 yesterday! Now it is at 15071! To be honest, it had to go up sooner or later, sub 10k difficulty gives up too many coins! But still far lower difficulty then 567358 difficulty of Bitcoin!

Probably explains why the NMC exchange rate doubled as well. It is still more efficient to mine NMC until the NMC exchange rate drops.

I mine with http://bitparking.com and exchange NMC to BTC on http://exchange.bitparking.com Have not had any issues with them, so haven't looked for any other Namecoin pools.

Also, you can find the current Namecoin difficulty level on http://namecoin.us under Tools.
Click to expand...

I've been having trouble connecting to bitparking myself. Might just be the new influx of users though.
 
Dallows said:
I just tried setting this up. Seems to be working but it's waiting for the blocks to download. Without a gui client how can I see how many blocks its downloaded so far?
Click to expand...

there are only 12k blocks vs 120k blocks on bitcoin, should only take a few minutes
 
Damn that was fast. I should have ordered it but Im still screwing around waiting to hear back from a guy on CL for a 5850, he email me over a day ago telling me he would sell it to me and now nothing.
 
Parja said:
Wow, they must have gotten a lot of them. I figured they'd be out of stock already.
Click to expand...

Yup. Just grabbed another 4. My CC says charged already so I assume it made it thru. My room is a MONSTER already. Weather guy has a high pressure symbol over my place already. LOL :D
 
Don't even bother with namecoin. As you can see in the link a while back they have corrected the mismatch. Just use BTC guild and transfer them directly to an exchange or you wallet.
 
anyone getting this error on bitparking exchange?

:Fatal error: Error decoding JSON
 
So, I was curious as to what my "break even" exchange rate would be with power costs and I came up with a little formula. I'm sure this is somewhere already, but I figured I'd post it for those of you wondering if it's worth it with power.

Assumptions:
- You know or can figure out your BTC generation per day.
- Computer (or farm) is run 24 hours a day (hence the 24 in the numerator).

Units:
Break_even_exchange_rate = $ per BTC
Power_use = kW
Power_cost = $/kWh
BTC_gen_per_day = BTC / day [or 24 hours]

Formula:
Break_even_exchange_rate = (24*Power_use*power_cost)/(BTC_gen_per_day)

Example:
If you make 0.25 BTC/day (like my piddly 4870 does), then to break even on power costs (0.4kW@$0.16/kWh) you would need to sell at or above $6.144 per BTC.

($6.144 = 24h*0.4kW*$0.16/kWh)/(.25BTC/day)

Hope this helps someone!

Let me know if there are any issues with the maths and I will fix them.

*Edit: Found this link useful from earlier in the thread, and it helps ballpark for people on the BTC/day number.
http://www.tvori.info/bitcoin/charts/
According to that, for the current difficulty level (ON AVERAGE) 100MH/s = 0.17728007 BTC/day (at the time of this edit)
 
Last edited:
Your math looks fine to me. I just hope we can keep mining profitable for a few more weeks. More BTC = More CPUS = More PPD = Less distance between [H] and EVGA
 
That was fast, Newegg is saying its shipped already. No tracking # yet, but its coming from CA
 
Briliu said:
So, I was curious as to what my "break even" exchange rate would be with power costs and I came up with a little formula. I'm sure this is somewhere already, but I figured I'd post it for those of you wondering if it's worth it with power.

Assumptions:
- You know or can figure out your BTC generation per day.
- Computer (or farm) is run 24 hours a day (hence the 24 in the numerator).

Units:
Break_even_exchange_rate = $ per BTC
Power_use = kW
Power_cost = $/kWh
BTC_gen_per_day = BTC / day [or 24 hours]

Formula:
Break_even_exchange_rate = (24*Power_use*power_cost)/(BTC_gen_per_day)

Example:
If you make 0.25 BTC/day (like my piddly 4870 does), then to break even on power costs (0.4kW@$0.16/kWh) you would need to sell at or above $6.144 per BTC.

($6.144 = 24h*0.4kW*$0.16/kWh)/(.25BTC/day)

Hope this helps someone!

Let me know if there are any issues with the maths and I will fix them.
Click to expand...

http://bitcoinx.com/profit/index.php
 
One factor to try to consider is the cooling cost, assuming you are paying to run A/C in the building. It requires additional cooling power to overcome the heat being generated by the PC.

This is ultimately the main reason I scale back my folding, particularly on GPUs, in the summer. My A/C efficiency goes way out of wack and I end up with huge electric bills because the AC has a hard time cooling the whole house while overcoming the heat from the GPUs.
 
Past 36 hours I've barely made 1 bitcoin. With a 5870 at 350 mhash on btcguild. That seem normal?
 
yes i believe so
im getting 370 on my 5870 on the same guild
damn i missed out, was going to go get a 5830 but hesistated
i guess ill get a 5770 now
 
so im about to do a complete format on my hdd to my new ssd, if i wanted to save my nmc how would i go about doing that?
 
jebo_4jc said:
One factor to try to consider is the cooling cost, assuming you are paying to run A/C in the building. It requires additional cooling power to overcome the heat being generated by the PC.

This is ultimately the main reason I scale back my folding, particularly on GPUs, in the summer. My A/C efficiency goes way out of wack and I end up with huge electric bills because the AC has a hard time cooling the whole house while overcoming the heat from the GPUs.
Click to expand...

I'm looking into building a small room in my garage with a window ac unit. Do you know how BTU relates to wattage so i know how large of a unit I would need??
 
Is there a way to calculate the expected payout for a hashing rate? At least for the current difficulty and assuming you are in a large enough pool (BTC Guild). I have one 5830 that has been going for 2 days and another that I added over a day ago and am currently sitting on ~0.9 BTC (confirmed & unconfirmed). Does that seem right? Total rate should be around 550MH/s for 24 hr and another 270MH/s for 24 hr.
 
I'm having connection issues with both the Bitparking pool and BTC Guild as well. Are the rest of you having trouble?
 
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