Two Sapphire Radeon HD 6990s are left. Waiting for other offers! Actually this is the best time to mine Bitcoins, because the price is growing!
Did a forum member buy one from you? Would be nice if he would show that you're a valid seller, because $300 for a 6990 seems too good to be true. |
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Oh  |
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Wish I could figure out how to get money into bitfloor though.. I don't have an ING bank anywhere close to where I live (I'd like to have a way to get cash in hand), and I'd rather not pay fees for wire. The free ACH withdrawal is nice though; i'm assuming ach is what dwolla uses to get money from them into your own personal bank.
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I'm really curious about 250v.. I understand almost all PC power supplies can take anything from 100-264v and 50-60hz frequency without no problems and adjust automatically. On my circuit breaker box (uses 1 inch square d breakers), I have 2 empty slots left (they are adjacent to each other). My AC power is normally 110-118v depending on load according to my 2 kill a watts. Is there some sort of circuit breaker I can put in to make it double the voltage (calling it 250v, but its probably less)? Right now I'm pulling 19A + an unknown amount from a 20A 115v breaker, and I'm worried that I'll trip it or burn something out. I kind of want to reliably be able to pull 4000-5000 watts without being in danger of frying any wires or breakers or anything.
Also, I noticed my cords are pretty warm/hot. I got about 1125 watts going through a 14 guage cord on a surge protector/multi outlet/whatever you call them, and it's pretty hot. Assuming the multi outlet can also accept 250v (which it probably cant, not the correct plugin) and I run the same amount of watts on 250v, would the cord be cooler to the touch? Only ask since I heard less amps going through a cord means less heat.
Will running 250v and subsequently lower amps compared to 110v mean less lost power? I know PC power supplies like to have a higher input power for efficiency, just wondering if there will be other places for power to be leaked in the form of heat, such as cords, circuit breaker, outlets, etc
Sorry if I'm talking like a noob, I don't know how to describe the situation correctly. Also sorry for asking so many questions. I just feel I need to reliably supply more (and better) power to my rigs. drawing 2100 watts from a 15A 115v sockets sure feels wrong.. even though the circuit breaker was switched with a 20A so it doesnt trip so easily.
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okay what is the Mhash? or...Ghash
At 1200 core speed, you're looking at about 711 mhash. At 1300 core, about 771 mhash. You will need about 1350 core to clear 800 mhash. edit: I didn't realize "barrier" was such an evil word ¬_¬ |
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Offering $250 USD shipped to 54501, USA for the 5970 that's fresh from RMA. Payable with Dwolla, BTC (negotiate how much at the time of transferring the coins), MTGoxUSD, but it may take some days to transfer from my bank into these sources. I can pay instantly with PayPal. Have conducted good business with other users on the forum so far with JL421, Brymaster, and fresh OTC rating @ http://bitcoin-otc.com/viewratingdetail.php?nick=Ssateneth&sign=ANY&type=RECV. I'm also open to other payment methods too, depending on difficulty. |
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6 rails? Huuuuugh. I hate having to load balance and having power locked to rails I cant use! |
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Got the mounting brackets in the mail today. +1 for OP
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should be at least 1mh Could be around 2000KH/s (2MH/s) but you're wasting your time. You won't even find a share with that. we'll see about that (what does finding a share mean?) i thought it's just a matter of processing time..... It is for the most part. But you are comparing a single core CPU at 2 GHz to one of the mainline GPU's used for mining, such as a radeon 5870, which is 1600 cores (!) at 850 MHz. You do the math. |
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I'll be keeping an eye on this thread for 5970 #3. Just learned that a parent is getting a big fat inheritance from dead uncle and offered to help me with some of my debts, so I may actually have funds again soon.
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Have you considered just BIOS flashing the cards?
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I was not aware that 1Gh/s was even possible on a 5970... That is just outrageous hashing power for an old card... Mine would only do about 700Mh/s a piece...  Yeah that 1Gh/s is pretty damn impressive.I just wish I could buy an HD5970 easily in UK (it's out of stock everywhere in UK) and reach those clocks (although I should factor in the cost of watercooling that monster as well). Impressive.I wonder what the power use is and what your PSU is rated at? As you'd need a pretty strong PSU to run that and a watercooler plus the rest of the system. PSU is a Seasonic X-1250. I'm thinking the system itself is pulling more than 1.2 kW from the PSU, but I don't have a watt meter to tell. It's a great PSU, everybody was recommending that over a Corsair AX1200. Also, I wasn't sure if the AX1200 could support 8 Pci-e cables, because it comes with 6 (as said on website), so that would limit me to 3 cards. While my SS has 8, so up to 4 cards. PCI-E power splitters and molex/sata > pci-e power adapters are your friend |
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This isn't a real offer, but I think $175-$200 would be fair from a miner's perspective. I see 5830's on the forums for about $85-$95, and a 6870 is just a slightly revamped 5830, uses the same VLIW5 architecture and 1120 shaders per GPU. This card has 2, so double the price, plus a premium for being 1 PCI-E slot and a "newer" generation. It has a degree of resale value. Gamers might into it for $210-240 I'm guessing though.
In reality though, I -could- be far from the mark. I've only seen a handful of 6870x2, so certain people may hold value in it's rarity. Looking on ebay and google shopping, the lowest price is around $350, and I can buy Radeon 5970's for $250, which are MUCH more powerful cards.
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According to my spreadsheet and latest mtgox, I gross $21.30/day with 4814 mhash. You're offering $4.40/day per 1000Mhash/sec, which is $21.18/day. I don't see the attraction for this offer tbh, aside from zero variance.
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You shouldnt get more than 340 mhash on a 5970 core @ 725 MHz, even with perfect ram speeds and miner/kernel options. If you're spiking 350-370, definately something awry going on there. Is your GPU activity maintaining 99+%? Doing nothing on the computer running on the miner? I'm running 5830, 5870, 5870, 5970, and 5970 and I get sudden dips of GPU activity (40-70%) if I do ANYTHING on it, and it kind of cascades between the 7 GPU's for about 30 seconds before stabilizing and getting back to 99.5+%
My GPU's maintain about 60-75% activity. And yes, its a dedicated mining-server at the momemt, so I'm not doing anything else on it. Tried only running one core again and then the activity goes up to around 96-98%. Strange.. What driver/SDK? Back with the old 100% bug if I ran both my cards on the same CPU, their hash rates would suffer. As I wrote in the main post, 11.10 and SDK 2.1. When it comes to the CPU it maintains about a 50% load. You shouldnt even get that much load either. I get 1% CPU on a 7 GPU rig, single core 2GHz. I'm going to bet you have a dual core CPU. You still have CPU bug. 11.12 and 12.1 don't exhibit the CPU bug with 2.1 SDK. Unfortunately, I tried 2.5 SDK a little while back on 11.12 and I had CPU bug. Will take some futzing around to get a 2.5 SDK combo working.. |
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Excuse me for sounding really stupid, but for a moment it looked like it was converting 120v AC to 32v DC, then I thought "whoa, wonder if they make 12v ones. super cheap miner power supply!"
Am I even in the ballpark? Probably not <.< Please explain what these do
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Is there any risk to having a device sit on a cooler? While my room isn't very warm, the cooler is very cool and seems like it'd be a nice place for the single to sit. Could this hurt it at all?
What sort of cooler, do you mean a small air conditioning unit or something? I can't imagine that cold temps would cause any issues, and BFL has said that you could potentially get better performance from a cooler unit. Uhh basically it would be on top of a vent for a house cooling system. Just keep an eye out for condensation,that would be bad,hmm-kay  Do you ever see condensation on the outside of a cup of hot coffee? What about on the outside of a glass of ice cold soda? Please, get your physics straight. There is absolutely no danger of condensation in this situation. It would actually cause the opposite. |
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There are 2240 VLIW5 shaders on each card in case anyone is wondering. For comparison's sake, a 5830 has 1120, 5850 has 1440, 5870 @ 1600, and 5970 @ 3200. Bid accordingly . That is unless you want to game on it instead. Gamers may find it more valuable. |
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Very cool Might be worth looking up the function of each pin to see how critical they are. I did. I looked at an Intel datasheet for the 1155 pinout, and it looks like the broken pin is for one of the DMI_RX sets, which is supposedly for communication with the PCH. The link to to PCH has four lanes so hopefully it just disabled one. Gotta love built in redundancy. |
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