I see you've disappeared from pool-x  |
|
|
|
You did your calculations, I guess. Were you aware that a GPU mining LTC spends more energy that mining BTC?
Regards
yeah, but even with the extra 70w i'll be making more with the diff increase. bitcoin's diff is rising way faster than its price. not only this, but ltc in going up in value way faster than btc. |
|
|
|
Today marks the day I switch to litecoin mining, as one the diff change in 10hr for btc I'll be making less mining BTC.  Come join me at http://ltc.kattare.com , just set cgminer --scrypt -g 1 --shaders [number for your card] and then raise your memory speed |
|
|
|
|
use reaper for 7xxx, cgminer struggles with large amounts of memory usage
|
|
|
|
|
Okay, I played around with it a bit tonight.
At 1.081 V on all cards, mem at 300 MHz, core at 1050 MHz, I get ~1620 MH/s on three 7950s at 180W / card.
At 0.931 V on all cards, mem at 1500 MHz, core at 900 MHz, I get ~1500 KH/s on three 7950s at 190W / card.
Heat produced by the two cards is about the same in both cases. Therefore, BTC mining uses 94.7% of the electricity while mining at 8% faster of a rate if you're comparing 1 KH/s to 1 MH/s. So, the damage isn't so bad so long as you undervolt and underclock your card. Beware overclocking/overvolting, as the heat generation with LTC (and subsequent inefficiency) seems to be pretty extreme.
|
|
|
|
First time miner here, looking to get some BFL ASIC's soon and doing some calculations on expected returns. Using: http://www.alcula.com/calculators/finance/bitcoin-mining/Assuming: 5 BF SC Singles: ~$6k for 300 Gh/s Power consumption: 1W/Gh @ 300Gh = 300W Electricity cost: $0.10/kW AND assuming price remains same (worst case scenario, as I'm pretty bullish), block halving, and 10x difficulty (again, extreme scenario): Total Hash Rate:300000 MH/s Average time to find one block: 4.75 days Average daily revenue (pre-halving): 10.53539662 BTC ($130.98) Average daily revenue (post-halving): ~5.26 BTC ($65.50) Average daily commissions/donations: 0.00000000 BTC ($0.00) Average daily electricity cost: $0.65 (0.05212355 BTC) Average daily profit pre-halving: 10.48327307 BTC ($130.33) Average daily profit post-halving: ~5.21 BTC ($64.85) Are those electricity costs really that low? I always hear miners complaining about electricity costs but really these seem pretty negligible. The efficiency is a couple orders of magnitudes greater with ASICs, not a single order of magnitude, so you should predict the network hash rate will increase 25- to 100-fold. Hence average daily profit post-halving I would wager to be close to 0.521 to 2.084 BTC a day within a month of ASICs coming onto the scene. |
|
|
|
brunic, I would recommend you change to solo mining with that much hashing power. i did with my rig and i'm very happy with it. with your hash rate you should get a block in less than an hour, and no pool stales so you get about 5% more litecoins. the guide is here: https://bitcointalk.org/index.php?topic=83371.0Basically all you have to do is install litecoin on each rig and then point the miner at the localhost |
|
|
|
All the more reason to pre-order.
By pre-ordering, in litecoin itself not some other currency, you help ensure the developers that there is in fact sufficient demand to justify developing the product.
Maybe even, the bigger the expense the better, since to manage to get ten million dollars (for instance) worth of litecoins escrowed ready to pay for ASIC development would likely involve litecoins being worth twice as much per coin than if one only escrowed five million dollars worth.
-MarkM-
Someone needs to actually bother testing the performance on FPGAs first, to see if it's worth scaling to ASICs. See my post: https://bitcointalk.org/index.php?topic=79637.msg1237205#msg1237205If an ASIC miner is made for LTC, I will fork litecoin and adjust the scrypt parameters manually to make it even more memory hard and forever fucked up the mining by FPGA/ASICs. |
|
|
|
|
pop off the covers and just throw ultra kaze's in from of them, I've done this and it works fine. they're $20 shipped on newegg and they cool better than the stock fans
|
|
|
|
yes he is right, as far as I know - no current FPGA Bitcoin mining device is capable of mining scrypt alt-coins
Maybe that's the project - making a new board for your modules to plug into... that allow them to scrypt. --- Then you could at least offer that as an 'alt-grade' for close to cost. It depends whether it's really worth it or not... NEON scrypt mining on ARM processors was no more power efficiency than GPU mining. GPUs have fast SPU clock rates and extremely fast memory, you may build an FPGA with ~300 integer units (eg spartan 6) hashing at 150MHz with DDR2 RAM only to discover that kh/s/w is not any higher than on GPUs. At best with ASICs of scrypt I would suspect you would get an order of magnitude in speedup, probably less. FPGAs then would be even worse, and aside from that refining BTC ASICs in the future will probably be more profitable anyway. Scrypt hashing circuits are about the same size as SHA256 hashing circuits in terms of gate size. I would suspect that if you could somehow make an ASIC comparable to that of the SHA256 ones with GDDR5 you would be able to hash scrypt significantly faster than and with less power than on GPUs, but the problem is that GDDR5 is expensive and so is the bus/interconnect. Additionally the amount of memory required per the amount of scrypt cores scales linearly as per the current algorithm, so if you make a chip with 20,000 scrypt circuits you will need to initialize 6-20GB of GDDR5 memory, which is expensive. Using slower memory and slower cores, as is possible right now with ASICs, will probably yield poor performance (GPU memory and GPU core speeds are an order of magnitude faster than DDR2 memory and typical ASIC core speeds). In short scrypt ASIC producers may end up competing with GPU producers, which would be a losing battle for the ASIC producers. |
|
|
|
That means 38% more heat generation too. Thanks. That's good to know.
Yes, it's a 15C difference for my 7950s. It's funny 'cause I bought these cards to mne LTC with, but it's cheaper to mine BTC and buy LTC. |
|
|
|
|
Mining ltc takes 38% more power for me to mine than bitcoin, and so profitability is currently less than for bitcoin. Ignore coinotron, as it neglects cost of power.
|
|
|
|
You don't need the molex plug on the riser cable with those smaller less power hungry cards. 5970s and 6990s is are the only cards I really see people need those types of risers...I guess there is always exceptions though.
The problem is that he's pulling through PCI instead of PCI-e though... You might want to get one just to be safe. If the soldered connections on the motherboard are only intended for 25w, it's probably better to pull it directly from the PSU. |
|
|
|
|
Yeah, the protocol made no sense.
|
|
|
|
|
Show Posts
