Cryptocoin Mining?

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Imouto

Golden Member
Jul 6, 2011
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In fact the difficulty is likely to decrease or remain about the same for the next period since the network hash rate is well behind the curve.
 

Accord99

Platinum Member
Jul 2, 2001
2,259
172
106
Even a stock non-OC 7950 won't be pulling 170W mining, gaming sure, not mining.
I don't run my 7950s at stock; they can reach that level of power consumption and hash rate at around .963v, 925 MHz core, 1250 MHz memory.

Certainly most people are trying to hit 600+ on their 7950s which will require high power use, but I choose to optimize more on hash rate per watt.
 
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Feb 19, 2009
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I don't run my 7950s at stock; they can reach that level of power consumption and hash rate at around .963v, 925 MHz core, 1250 MHz memory.

Certainly most people are trying to hit 600+ on their 7950s which will require high power use, but I choose to optimize more on hash rate per watt.

You have a golden sample that undervolts and OC at the same time, its not a valid comparison to the most cards on the market.
 

Accord99

Platinum Member
Jul 2, 2001
2,259
172
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You have a golden sample that undervolts and OC at the same time, its not a valid comparison to the most cards on the market.
I have dozens of these 7950s and 7970s ranging from Gigabytes, MSIs, Asuses and (mostly) Powercolors.

I'd expect most 7900s can do this, but most people are trying to maximize hash rate regardless of power consumption.
 

thilanliyan

Lifer
Jun 21, 2005
12,033
2,246
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You have a golden sample that undervolts and OC at the same time, its not a valid comparison to the most cards on the market.

Both my HIS 7950 X2 cards can mine at 0.975v 950/1250 MHz. Keeps the cards cool and noise way down. Don't know why default voltage is 1.25v?!!
 

nwo

Platinum Member
Jun 21, 2005
2,308
0
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Both my HIS 7950 X2 cards can mine at 0.975v 950/1250 MHz. Keeps the cards cool and noise way down. Don't know why default voltage is 1.25v?!!

I don't know either... The default voltage on my reference Powercolor 7970 is lower than 1.25.
 

pm

Elite Member Mobile Devices
Jan 25, 2000
7,419
22
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I also run my 7950's at 0.975, 950/1250MHz. I also drive the power limit % down as well. I only get 500-550kh/s out of them but they don't make any noise and run pretty cool. But over the years, I've started a little server farm so I watch the power both from an economical standpoint but also because I have so many cards that you can start to heat things up uncomfortably if I run them at max.
 
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blastingcap

Diamond Member
Sep 16, 2010
6,654
5
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Close, but not exactly

The difficulty is adjusted every 2016 blocks based on the time it took to find the previous 2016 blocks.
At the desired rate of one block every 2.5 minutes, 2016 blocks would take exactly 3.5 days to find.
If the previous 2016 blocks took more than 3.5 days to find, the difficulty is reduced.
If they took less than 3.5 days, the difficulty is increased.

The change in difficulty is in proportion to the amount of time over or under 3.5 days the previous 2016 blocks took to find

https://litecoin.info/Difficulty

In the context of my sentence it's clear I made a boo-boo since I talked about maintaining a constant production rate, but thanks for the correction. I have now reworded it to say "proportionately increases" instead of "doubles" because the doubling is only in cases where the hashrate doubles.


In fact the difficulty is likely to decrease or remain about the same for the next period since the network hash rate is well behind the curve.

Nope. Hashrate is still above currently difficulty so when difficulty resets again in 2.2 days, difficulty will be higher than it is now, though the rate of growth has slowed down over the last day or two, maybe because winter weather has delayed a lot of shipments. I would expect difficulty to continue to explode for the foreseeable future.
 
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Imouto

Golden Member
Jul 6, 2011
1,241
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Nope. Hashrate is still above currently difficulty so when difficulty resets again in 2.2 days, difficulty will be higher than it is now, though the rate of growth has slowed down over the last day or two, maybe because winter weather has delayed a lot of shipments. I would expect difficulty to continue to explode for the foreseeable future.

I'll be back... in 2.2 days.
 

cbrunny

Diamond Member
Oct 12, 2007
6,791
406
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OK - so what I've taken from this conversation thus far is that difficulty doesn't matter to the miner because blocks are still found at consistent rates.

Difficulty doesn't matter in the context of blocks shrinking either because they're going to shrink regardless of what the difficulty is at the point where a certain number of blocks have been found.

So, difficulty doesn't matter in any way to the miner.
 

Smartazz

Diamond Member
Dec 29, 2005
6,128
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OK - so what I've taken from this conversation thus far is that difficulty doesn't matter to the miner because blocks are still found at consistent rates.

Difficulty doesn't matter in the context of blocks shrinking either because they're going to shrink regardless of what the difficulty is at the point where a certain number of blocks have been found.

So, difficulty doesn't matter in any way to the miner.

No, it matters tremendously to miners. Thanks to the increase in difficulty, I'm making half as much now as I was less than a month ago.
 

blastingcap

Diamond Member
Sep 16, 2010
6,654
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OK - so what I've taken from this conversation thus far is that difficulty doesn't matter to the miner because blocks are still found at consistent rates.

Difficulty doesn't matter in the context of blocks shrinking either because they're going to shrink regardless of what the difficulty is at the point where a certain number of blocks have been found.

So, difficulty doesn't matter in any way to the miner.

NO!!!

Difficulty matters, think of it this way: Bitcoin is like a raffle where every 10 minutes on average, the raffle awards a $25 prize. The prize remains fixed at $25 no matter how many tickets are sold. If only one person buys a raffle ticket for $1, they win $25 and the profit is $24 after accounting for the cost of one ticket. If 2 people buy, they have 50/50 chance each of winning so the expected return is only $12.50 minus $1 for the ticket = $11.50. Etc. Difficulty is like the number of raffle tickets sold. If millions of raffle tickets are sold, then each ticket has a very small chance of winning the prize.

Same story for virtually every other cryptocurrency, it's artificial scarcity built into the software itself. Ironically everybody would be better off if they could agree to stop the arms race and simply take turns buying one ticket every 10 minutes, but that isn't realistic. So everybody pays for more and more raffle tickets (more and more mining equipment) until there is no profit left.

I'll be back... in 2.2 days.

You do that.

 
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f1sherman

Platinum Member
Apr 5, 2011
2,243
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we have just passed 1/3 of 2016 block window.

in order to predict next difficulty you would need to integrate (predicted) network hashrate over 2/3 (2016) of remaining blocks.

so I'd say next diff. is highly speculative at this point in time. But yeah...blastingcap is right - if hashrate remains the same, diff goes up 1%

@Imouto I know what you're thinking looking at that diff/hashrate graph - you're not looking it right
 
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Z15CAM

Platinum Member
Nov 20, 2010
2,184
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If a R9 290X can Hash approx 1000 will 2 x's 290X's hash yield 2000 OC'd under water?

What Hash Rates can I expect with say 2 x 290X's running at 1250/1550 24/7 in regards to the number of LiteCoins per week?
 
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Feb 19, 2009
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2,000 kHa/s is a good expectation for CF R290X under water. Maybe a bit higher depending on the stability. Mining puts more load on them (~30% more power use) than gaming, so you may find your 1.25ghz OC won't be stable (due to VRM issues) so don't expect miracles.
 

geokilla

Platinum Member
Oct 14, 2006
2,012
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Did anyone install the latest beta drivers? I just did and I can't get more than 30 KH/s
 
Feb 19, 2009
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Go to dustcoin.com

and plug in 2000 kHa/s and you will see around 22 coins a month at current difficulty. but its rising (tho not as fast as it had in recent weeks), so I would say if you started mining today, in a month's time you will probably have around 15 coins.

It will depend on what 15 coins is worth then, or heck, one year from now. Im betting its going to be worth 10x the current prices next xmas so i'm saving all the coins I get.
 
Feb 19, 2009
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sif contemplating, DO IT. having two r290 and its not printing you $$ is silly hehe. At least when you're not gaming, set it to work. After a month it will pay for itself and its a free upgrade, beyond that, its earning you $$ for future upgrade to 20nm GPUs.
 

blastingcap

Diamond Member
Sep 16, 2010
6,654
5
76
Overvolting for mining is stupid unless you have cheap power and water cooling. Higher voltages and heat out cards faster if it doesn't break them first, all for a minor gain in hashrate.
 

cbrunny

Diamond Member
Oct 12, 2007
6,791
406
126
NO!!!

Difficulty matters, think of it this way: Bitcoin is like a raffle where every 10 minutes on average, the raffle awards a $25 prize. The prize remains fixed at $25 no matter how many tickets are sold. If only one person buys a raffle ticket for $1, they win $25 and the profit is $24 after accounting for the cost of one ticket. If 2 people buy, they have 50/50 chance each of winning so the expected return is only $12.50 minus $1 for the ticket = $11.50. Etc. Difficulty is like the number of raffle tickets sold. If millions of raffle tickets are sold, then each ticket has a very small chance of winning the prize.

Same story for virtually every other cryptocurrency, it's artificial scarcity built into the software itself. Ironically everybody would be better off if they could agree to stop the arms race and simply take turns buying one ticket every 10 minutes, but that isn't realistic. So everybody pays for more and more raffle tickets (more and more mining equipment) until there is no profit left.

I understand this. It occurs to me that a more accurate method of measuring this is a simple ratio of

pool or self hash rate / global hash rate

That would be a far more accurate way of estimating the likeliness of finding the next block. Difficulty obviously serves a purpose within the main server but as a variable that indicates the probability of finding a block it is weak at best. Inaccurate as soon as any hash rates (global or local) change.
 
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