I'm definitely looking for max iops. You make a good point about reliability. I'll be running linux on this, but still, Intel has a strong track record of solid silicon |
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After doing some research, I ended up getting an Intel 320 80GB SSD for my main system, mainly based on Intel's reputation for reliability. So far so good.
I had an Intel SSD for a long while. Not the fastest, but very solid. In this case I'm looking for something that would work well in a server. |
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Yep, kind of like in a fishbone pattern especially when there's only one exhaust channel. The main reason why I'm suggesting this is because the heat from the first row would get blown over the second, and so on if you arranged them without angling. Hence, the cards in each row will have different temps and giving you a much bigger headache when trying to find a stable oc configuration. I had two rows of my cards like below (sorry for the failed ascii art  ) (open window) (cards on motherboard 1) (cards on MB 2) | |------| |-------| |<--exhaust direction |------| |-------| | |------| |-------| and the cards on MB1 went regularly higher by 7-8*c until I shifted both mb's in the fishbone pattern. Yeah, I could definitely see how the way you had it set up initially would let hot air from one rig go into another rig. I'll give the fish bone pattern a try. Hopefully it will work well because moving those racks is a HUGE pain |
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This isn't exactly mining-specific, but I'm going to be putting together a server that will do lots of transactions and need a recommendation on an SSD.
I want to start small with a single 120GB 6Gb/s SSD that's not too expensive, and then later go to a RAID 5 with 3 oif those SSD's and a hardware controller. Further down the road I could think about SLC enterprise SSD's, but I need something to get me going that will be fast with transactions and not too expensive
Drives I'm considering:
* Patriot Pyro
* OCZ Vertex 3
* Crucial M4
* Intel 510
Suggestions?
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Seems the last row (nearest to the exhaust side) will be cooked easily by the previous rows. You'll need to put them at an angle like what rjk said, but for different shelves too.
edit: maybe put them angled towards the exhaust like 20-30 degrees? that'll make sure the exhaust gases from the cards converge towards the middle, and get pushed by the fans in middle.
Are you thinking like in a fish bone pattern? It would seem to me that you would want it to open up wider near the exhaust end to disperse the heat. If you had it get narrower, then it seems like it would make a funnel of really hot air |
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One thing I do know is that you are going to need a slight positive pressure with your airflow. Right now, you have only an exhaust fan, which creates negative airflow, which can result in hot spots.
You must balance the intake and exhaust so that the intake CFM is slightly higher than the exhaust CFM (but not by too much). This allows for airflow to be better distributed around the room. A small-scale example of this is a standard computer case.
Another thing to consider is possibly to put the racks at a slight angle, maybe 30 degrees and offset so that the exhaust from the rigs closest to the intakes don't cook the adjacent rigs on the same shelf.
I've thought about the positive pressure. Is there any way to measure that? I can try to take a guess but there are leaks of air from the roll up door and other places, so I can't be too precise. |
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Heh, Ohio, like I said "probably not"  If it is all miners, that is more heat than an average server rack, but if it has "normal" servers as well, then it is easier to cool (in general). It sounds like you already have it running, and you just want to optimize it a bit, is that right? Yup, Ohio isn't down the street  It's almost all miners. They are open air rigs with two to a shelf x 5 shelves in a rack. Here's a picture of one being assembled as an example:  The space itself is fairly square - 25' by about 30'. Because the outside air is usually quite cool (in the upper 40s here now) I don't have A/C. I just have a single 2300 CFM exhaust fan and a 16" fresh air supply inlet on the other side of the unit. By my calculations I'm creating just over 200,000 btu once all of my new rigs are up and running. So my current thinking is to put in a 24" or 36" exhaust fan for up to 11,000 CFM (like this one: http://www.jdmfg.com/index.cfm?event=pageview&contentPieceID=6977) and then add a couple more intake vents. Then I need to figure out how to arrange the racks. I'm thinking of something like below, but I am worried that the airflow won't work this neatly. Mostly I just want to avoid having rigs sucking in hot air from another rig/rack.  |
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I have a fairly large server farm running in an warehouse. I'm looking for someone to help me design a good air flow solution.
If you're an HVAC specialist, drop me a PM. I could use your help!
Not an expert by any means, but I would love to see pics of your setup. And, if you are near by me (probably not), I could sell some used datacenter A/C units. (4 stage dual compressor 10 ton Liebert CRACs) I'm in the Seattle area. Where are you located? I'll try to get some pics tomorrow. Right now I have about five racks, each of which could easily be moved for optimal airflow. |
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I have a fairly large server farm running in an warehouse. I'm looking for someone to help me design a good air flow solution.
If you're an HVAC specialist, drop me a PM. I could use your help!
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If you have the space, that might be a good idea. Fitting 4 cards instead of 2 per board would take less space and need 2 PSUs, but the board would cost more than double a dual slot board.
I looked around for a few minutes, but didn't see any outstanding deals on dual slot boards, except for refurbished ones from geeks.net.
Yeah that's the issue with four cards. I'd rather keep things simple. Thanks for looking around though! |
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I have 3x6990's on an MSI 890FXA-FD70 ... no risers, no power bypass.
System did 2630 mhash/sec in the 1.175 volt setting and pulled 1460 watts at the wall ... actually had to step it back because I kept hitting 1500 watts. Plus this was a 1200 watt PSU and although it performed this way for a month I've since decided the extra power wasn't worth it.
So at 1.12 volts and -125 memdiff the system ran 2520 mhash/sec @ 1170 watts (95 watts system) for 356 watts per card.
Flashing the 1.175 volt bios with 1.12 volt a 150 mhz memclock reduced the power by 150 watts for 1020 watts or 306 watts per card.
Are you running your memclocks at 150MHz or core clock minus 150? Anything less than 300Mhz (at least on the 58xx series) definitely impairs performance. |
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Hehe sorry , Will these be used as gaming pc with a decent CPU ? Otherwise I'd be thinking about some getto rack configuration, with 4-5 card earch. (save on cost and power) These are for my mining farm. I can do more cards per system, but then the cost for each PSU goes up or I need to do dual PSU's. Even though managing more rigs isn't fun, I'd rather keep my costs low and make management easier through software. |
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I got a hint for you, get any board ASAP as long as you aren't paying 30$ too much for it.
This seems like a waste of time, really.
I need to buy about 20 of these, so if someone said "hey you can get x motherboard for $45", then I've saved myself about $400. Might be a waste for you, but I'll gladly save $400, $200, etc. |
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I need to buy several motherboards for 6990's. I've been looking at an ECS A885GM-A2. http://www.newegg.com/Product/Product.aspx?Item=N82E16813135272I has two PCIe x16 slots with two x1 slots in between, which makes for a good amount of space between cards if I put two 6990's on this motherboard. Until just recently Newegg was selling them for $54.99 with free shipping. Now they're $65 and shipping is $3. $13 more per board multiplied by the number of boards I need to get is going to add up. Given that I'm a cheap bastard, I'm wondering if anyone knows of a good alternative - something with two PCIe x16 slots with extra space between them and it takes an AMD CPU. Could be a prior generation. |
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Scammer paperwork has been filled out and submitted. This is in theymos' hands now. Unfortunately, the evidence I submitted is quite convincing. Sorry shakaru.
I don't usually share my two cents on these mob mentality posts, but the posts I've seen seem to be off base. I've done many deals with shakaru since last summer. He lives in the LA area like me, so I have been to his place many times and seen the rigs that he has. I've never had a bad deal with him. Maybe I’ve been lucky, but I don’t think that’s the case. I truly do not believe he has the intention of scamming anyone. That is not the Andrew I know. It seems much more plausible that this situation is the outcome of a series of unfortunate events. While I won't apologize for any mistakes that shakaru has made, as a small community I think we need to think hard about how we respond to situations like this. Things do go wrong from time to time. We make deals, buy contracts, and make commitments with the hope that everything will go right. Sometimes they don't and the people involved should do what they can to make things right. It's normal to be angry that things didn't work out, but we shouldn't stoop to the level of burning someone at the stake for being a "scammer" to enact some kind of revenge to feel better. |
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is this listed yet?
Not yet. But soon |
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does the motherboard come with anyhting or no i was watch an auction on eby that had cpu and ram and it sold for 83 theres also a acution on there for 20 dollars now that ends in a day.id be willing to pay like 60 if youd be willing to accept unless it come with cpu and ram
If you can get it for $83, you should buy it. They can be hard to find on ebay and rarely less than $100. |
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All down???
Doesn't work for me either |
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Cooler Master 450W PSUs sold to Tril and shippped.
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