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Thermaltake 500W
Edit: It seems I might be safe. The PC didn't restart again and it was open for more than 48 hours.
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If I'm not wrong, it's OpenCL AMD bug...
Disabling flash hardware acceleration fix the problem, at least for now.
If you play hardware accelerated videos, the clock of the GPU AMD / ATI is lower, 400MHz GPU / 900MHz RAM,
and then also slows down the mining.
Thank you for the reply, knowing what's wrong makes me feel a lot better  . I was afraid it was a more serious problem since its a new card. I will just avoid watching videos on the PC while mining then. Not so hard to do since I have a laptop and I can watch them there . |
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I bought a new HD 6950 and put it to work at mining. But I encountered several problems. First, when its mining and I try to put a youtube video, the PC freezes. I am almost certain that this is related to the 98% usage of the video card while mining. Edit: I found out that this related to the flash hardware acceleration.
But the problem that worries me is that the PC restarted a few minutes ago without any error or warning, without even using it. I was in another room at the time so I didn't see what was going on. The temperature of the card was a steady 65C, so okay. Is there any way to check why it restarted? I am using Win7. I didn't see any error message when the system restarted.
The PC was left alone to do mining for about 14 hours with no problems. I am using guiminer.
I didn't overclock the card and I don't want to do it.
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Too few information..Do you monitor the card's temp? CPU and memory clock is default? Underclock the memory(use msi afteburner) to about 320 to 350 mhz(try different values each card is different) to decrease the temp. Then you can try to overclock the gpu to get better MH/s values.
Try few versions of ATI SDK and graphic drivers too.
The temperature is normal, max 65C, but the activity is 98%. I don't plan to overclock at all, I am satisfied with my Mhash/s, and I have a 3 year warranty that I don't want to risk. And my computer works normally, I can use the internet, it has about 12 hours since it started mining and it didn't freeze, but like I said, it freezes in about 1 second when I start any youtube video. The weird thing is that the sound of the video freezes a few seconds later. |
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I have a small problem since I bought my new HD 6950. When I try to watch any youtube video while mining the computer freezes and I have to restart. Is this normal or is there something wrong with my new card?
Secondly, with the latest guiminer 20110701 the mining speed decreases in my case by 5 Mhash/sec. Lucky I still had the other version.
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No offense OP, but I have trouble understanding how are you willing to invest in bitcoin mining apparently without even knowing about online exchanges, dwolla etc.
Reminds me of when my wife tried to explain to her coworkers how we are taking additional income from online poker.
She passionately talked about how it's not really gambling but a game of skill and a duel of minds, where you need to exploit your opponents weaknesses to be rewarded, how we're playing several hours a day and having made so-and-so much money...
And after all that, her coworker said: "yeah, it all sounds neat and all, just too bad you can't take the virtual money that you won from inside the computer and actually buy something with it"...
The point of my thread was to find out if there is truly a possibility to earn something, and this way decide if I should invest more time and money in Bitcoins. And I found out and I am grateful to all who answered. What you mention are details that I must cover once I actually have some bitcoins and want to sell them, or when I will buy bitcoins, and this way I will find out for myself how everything related to bitcoins works. But I am new, all these details with the exchange were mysterious and caused a certain uncertainty for me, and I felt the need to make sure that its real and you can actually win, not from sites that say that you can anonymously, but from actual people that do actual trade with BTC. That's why I thought this was the best place to ask, and I was right. This is a very new idea, and sounds amazing, but its also quite hard to believe that it really works. Therefore, like I said, I felt the need to make sure. |
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Thank you again! Very helpful.
I decided that I would buy a good video card that I might use for gaming also, in case mining will prove not be so profitable in the future. I found a good promotion on a 6950 with a reduced price and a free game, Shogun 2 Total War, so I will most certainly buy it. And since most of the time I study on my laptop I can leave my PC to mine.
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Thank you for the replies!
Since I couldn't find any store in my country that has at least one HD 6990, I focused on the other options. And I switched to the HD 6950 option instead of 6970, since it is cheaper and with a good mining performance on paper.
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And the free game is Shogun Total War 2  . A good game that I planned to buy in the future anyway. And as a greater incentive I think that my old video card is broken. I had this surprise an hour ago. |
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Actually I decided to buy for now one 6950 for my gaming needs, but since most of the time I have to spend time on my laptop to study, I will use it for mining. I found a great offer of the 1GB version with a game present, so I think I will most certainly buy it, even if I won't make any profit from mining.
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Well, I guess that my dreams of mining end here then  . Thank you all very much for saving me from taking a bad decision. |
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Thank you for the replies! Its great to hear that you can earn money like this.
Now its time for me to see if its not too late to mine, because it seems that is the case.
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Thank you for the reply. Unfortunately I have to pay 15 cents for power, that means its not worth it? I planned to buy 2 cards hd 6970 and this calculator ( http://98.200.247.249:81/btc_calc.php) shows that I might be able to still make some profit, even get the return of my investment in 100 days. |
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I just discovered Bitcoins a short while ago, and I would like to able to mine a little too.
I am not thinking about farms, just to upgrade my PC and mine, and try to earn back the money from my investment and maybe get a little profit. Is this realistic right now, or truly I am too late to start mining?
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The 5870 and 5970 are the more energy efficient (cheaper electricity bill). The 5850 and 5830 are usually the best for initial cost per MH/s but it really depends at the price you buy them (and you have to think that if you plan in selling it at some point, the series 6 will be easier to sell than the serie 5, but this is only important if you plan on selling).
Thank you for the reply! I started to look at the 5xxx series to see what might be suitable. |
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Personally I'd just go with the 2 x 6970's rather than wait.
And with regards CF, most people report lower hash rates and I experienced the same when I CF'd my 2 x 6950's
Thanks you, that's what I thought. I have never CF two cards, is it something that I can change easily in the settings, or is it more complicated? |
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nakowa, HD 6990 is not the best card for mining
too expensive. a cheaper 5xxx series will get you more Mhash for your $ AND use less power and run cooler
so you seem far from an 'expert' to me with your naive advice to buy expensive gear.
Really? Which cards do you recommend because I was planning to buy one 6990. |
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Thanks for the reply. I know that page, I look at it constantly when deciding what to buy. I know that one 6990 would be best, but I can't find any store in my country that sells it, they are all out of stock. And I wouldn't like to buy it from amazon and wait for it 1 or 2 months. In a few days I would like to start mining. And why shouldn't I CF them? |
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I looked today for a HD 6990 to buy and couldn't find one. But I could find HD 6970. So, in theory, 2 6970 cards in crossfire should perform the same as 1 HD 6990, right?
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I am prepared to invest my time and plenty of money in buying a mining PC, and maybe buy some coins, but I want to make sure that there is a chance I might get the money back from my investment, and the best way to make sure is to ask if you personally held some dollars or euros in your hand after changing some BTC's obtained from mining.
I already asked a similar question in the newbie zone, and I got a yes answer, but I am still not totally convinced. I want to be sure that some people won something before placing my orders.
In fact, it's quite easy to sell BTC mined by yourself, since most who believe in Bitcoin think buying is better choice than mining. You're about to invest your money ('real' currency), then you'd better think for a while about risks you'll take. I'm currently running dozens of rigs (equipped with HD 6990) which were assembled last month, and I think my advices are useful to you: 1. Do not buy cheap hardwares to save money. If your hardware get damaged, what's you lose will not only be the price of your damaged hardware, but also that of opportunity (your mining rig is broken, so you have no BTC income before you repair your rig(s)...) 2. Do not calculate your possible 'profit' by peak performance of rig's GPU. A discount of 10% is almost certain. 3. Do not forget to think about accelerating difficulty. Your rigs might well mine only 0.5 BTC next month while they can mine 1 BTC right now. 4. Do not undermine the difficulty and troublesome of fulfilling the need of electricity ... 10 Rigs perhaps need a power of 12,000w! 5. Do not use Windows as mining platform. Windows is vulnerable and unstable. 6. Do not forecast BTC exchange rate too optimistically, remember, pessimism sometimes protects you. 7. Do not expect mining pools are stable, they are in fact unstable; so do not naively assume they are stable and do not calculate your future profit based on false fact. 8. Do not assume your wallets are safe... Once you have more than 10 BTC, you'll face entire different situation than you only have 0.01 BTC in your wallet. 9. Do not forget you're merely a human being, you need rest, sleep, you cannot be alert all the time, you'll make mistaks... which might well have a huge impact on your future income... 10. Do not sell BTC too soon or too late. This last advice is ambiguous but useful, since the decision depends on your faith on Bitcoin system. Good luck. You can contact me on gtalk: nakowa@21bitcoin.comNakowa [1CaqVVrkoPetMVQJivBs14JKqdX8w2rBHG Thank you very much for the good advice. And please excuse my stubbornness, but I have to ask, since this is the point of my thread. Have you held in your hand, or have in your bank account, dollars, euros, or whatever your original currency, earned from this massive mining? All I ask is a simple yes or no. |
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