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Did you undervolt the cards?
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One thing to note though is that Cryptsy prohibits you from mining directly to your Cryptsy deposit address, so you'll need a wallet to attach to your mining pool and once you accumulate a good amount of coins, send it to your Cryptsy account address and trade it.
Where does it say that? When you create an address for a specific coin. The exact warning is: "Notice: Do NOT mine directly directly to your Cryptsy deposit address." (Yea, they have a type there) Yes. That's because they are unable to credit you if you're using p2pool or whatever was the issue. No, you don't need a wallet and you can withdraw directly from the pool to Cryptsy. |
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One thing to note though is that Cryptsy prohibits you from mining directly to your Cryptsy deposit address, so you'll need a wallet to attach to your mining pool and once you accumulate a good amount of coins, send it to your Cryptsy account address and trade it.
Where does it say that? |
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Search this forum for "PCI-e risers". There are new ones with USB cabling and more flexibility. Regarding the cards models, I believed that having Hynix vrams was a guarantee of good mining performance but it seems some can come mis-configured. The best you can do is make an agreement with an hardware store which allows you to exchange the cards if they give bad performance. In alternative, go to: https://litecointalk.org/index.php?topic=12369.0 . Please search the thread for a suitable bios before posting or donate upfront, asking for him to configure it. I've seen newbies behaving like brainless leeches and pissing off people that contributed to the scene, including who offered custom faster .bin files. |
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Depends on the model. There's a FirePro equivalent to a 7950
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What is needed for coin-switching pools is to take SERIOUSLY, what is mentioned on the middlecoin FAQ. Which currency are you currently mining?
I can't make that information public, because it would increase the network hashrate of that currency, increasing the difficulty and orphans, lowering our profits. But rest assured that my profitability calculator is advanced, accurate, and up to date.
What currencies do you mine?
I can't make that information public either. But I consistently check the profitability of coins that are put on exchanges. So the basic answer is "the most profitable ones".
Pool operators that cater for newbie miners (like me still) or who loves statistics and cute websites do otherwise. Meanwhile they destroy coins, the value and the mining scene. They offer profits to someone else's trading bots, instead of to miners. The ones that are into such mining scene for more than a few weeks, get this crystal clear. Besides what impacts profit, I don't want anything. Basically what is required for having: - Nearby stable low latency pool - No connection loss on coin switching - Low rate of rejects/orphans/discarded - Good choice of coin - Very good trading bot/algo Everything else is a waste of your time and effort. For me, you don't even need a website. Edit: if you want to offer transparency, you can show on the website the coins you mined in the past, no need to show what you're mining NOW. |
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It's a driver issue. Stock AMD drivers with Win7 only support 4 cards. Look around for modified drivers or try a different OS.
This. |
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I have no direct answer, but a few ideas on how to mitigate/improve.
load msconfig.exe and configure boot with vga video. Reboot to see if it does what you ask, even if you only have 640x480 for now.
Play with --gpu-dyninterval on miner config
Use CGWatcher.exe to adjust the intensity, depending if the system is idle or not.
I remember bitminter was very responsive, even mining BTC on the GPU. Perhaps it has to do with video memory being busy with scrypt coins
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Thank you very much, man.
What about motherboard, will it be OK?
Yeah, I didn't reply to the mb part, I'm not sure. I'd suggest the cheaper one because system level OC has no effect on mining. What happens though is that OC friendly motherboards have components rated for the extra stress, including better capacitors, more phases, better cooling, etc... Elsewhere I read about boards having issues detecting the 4th or 5th GPU and serious problems with more. Sometimes it's disabled PCI-e connectors when the adjacent is used, others is PCI-e related problems until you disable integrated audio and firewire or disable some power saving options ... In other words, between those 2, I'd choose the cheaper one. If any of those 2 is actually a good choice for mining in the first place, that I don't know. Still related with storage; if you intend to solo mine, you will need some extra disk-space for the blockchains. Otherwise 30 GB is plenty for a mining rig with OS and lots of of utilities installed. |
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Does anyone know why they'd be able to release a BTC+LTC asic a lot easier than an exclusive LTC asic? There is a huge arms race right now in the LTC world for the first ASIC so I don't understand why these guys wouldn't go "all in" on a LTC asic. They would be the first, and reap huge rewards for that.
Because scrypt requires SHA2 circuitry anyway. SHA2 related transistors would be in the chip, idling 90% of the time. Why not use that part of the chip to mine BTC during those idle cycles? What they can fine tune is how many SHA2 units they choose to put in a chip, to control die area and costs. That has to do with it's size vs the rest of the required logic. If they are small, why not? |
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The Evga Supernova 1300W PSU is good and not too expensive. A normal hard drive can be used, even laptop sized afaik. No need for SSD or hybrid. People recommend small SSD's because they end up costing a bit less than a 500GB HD while installing and booting faster. Also, you'd not want downtime on a 1500€ rig due to the 50€ hd failure I have one rig with Windows 7 64 SP1 loading from a 32 GB Sandisk Extreme USB pen that I had before, learned how at www.rmprepusb.com . A cheap 32gb USB will work, but preparation, installation and boot are sloooow. It requires 6 GB ram because W7 stubbornly refuses to create a swap file on the usb |
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Does it even have the 2 required PCI-e connectors, an 8 pin and a 6 pin? Does it have 30A on the 12V rail?
If it doesn't and you want to use that PSU, get the Gigabyte R9-270 OC card and a PCI-e molex adapter. Decent 470+ Kh/s
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At what pool are you mining? Hashrate can vary depending on the pool and coin you're mining.
Test with --gpu-memclock with the values 1500, 1625 or 1750
also with --thread-concurrency 20480
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I just ordered my mining gear for $2000..... am I making a huge mistake? What did you buy for $2000? |
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You claim the cards didn't go above 80ºC but it is incorrect. What never went above 80ºC is the GPU core.
Load Gpu-z, look at the Sensors tab and see if it shows VRM temperature. If they go above 80ºC, you MUST undervolt your cards with VBE7. If it doesn't show anything, then it's even worse because one never knows. You might as well pray. I've seen 110ºC vrm on a 7870.
You should undervolt anyway, to protect the GPU, the vrm and the PSU, reduce heat and save power
Then you aren't suppose to overclock the core for getting hashrate. The ram first, to 1500, 1625 or 1750 Mhz, then the core only up to a point
The Cooler Master PSUs aren't that good either.
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Hold on, OP, you have a Nox Urano PSU... How is it doing? How many PCI-e connectors does it have?
This is a very affordable PSU, I can get it for 120€
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OP, a Corsair or Seasonic 850w is fine for 3x 7970 if:
1) you undervolt the cards, at least down to 1.08V or even better if you can get below.
2) the PSU has the required # of PCI-e connectors.
3) the PSU is single rail and provides 70A on the 12V line
4) the room is well ventilated and you take extra precaution in hotter days
Note that for 24/7 operation for months or even years, you shouldn't pull more than ~80% of the rated capacity, so 850w is really the minimum recommended.
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Oh, I could I missed mentioning the OS??  I wonder if there are benchmarks out there: Windows 7 vs Windows 8 vs Linux. I know that the drivers display model gets in the way of the video performance (remember XP vs Vista for gaming?), but for mining I have no idea. |
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their  Edit: $1800 ?? Some guys will go for it though, not realizing the 7950 became popular for mining because it costed $200 |
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