 Show Posts
|
|
Pages: « 1 2 [3] 4 5 »
|
I'd by the lot at 220 each. If any of them are sapphires I want nothing to do with them 6 months of mining and those fans are almost certainly almost dead. You're lucky if they last 3 months.
Bullshit. I have had Saphire Vaper-x 7950's running for 8 months and the fans are still kickin ass as I type this. I have 12 of them and not a single one has messed up. On the other hand I had a MSI that went to shit. While results my vary the poster you responded to was correct, the sapphire fans are pretty weak, and failure of any fan is to be expected (especially these) if you look at the build quality of the fans. They are thin flimsy fans with cheap sleeve bearings, certainly not up to the task of 24/7 mining like we use them for. The fact your's are at least spinning also doesn't prove they are in good shape or functioning properly. I have many spinning fans on my sapphires that are on their last legs and in failure mode. Just be prepared when they fail in the worst possible time during a hot spell in the summer. Part of it depends on which Sapphire. We run the 4L versions and have 48 of them running since April without a single problem. Fans run perfect, no additional noise etc.. Can't speak to the Dual fan designs. I think you're right on that, I haven't had any issues with that cage style fan like on the 4L either. Don't have quite as many as you do to compare though, but they seem pretty bullet proof and certainly do come in handy for directional heat in the winter  Dual fan is where the problem is. For comparison, gigabyte have a similar style fan to the dual X but I have yet to have any issues with those fans. Op, no worries, let me know when you get a chance to update about the cards. |
|
|
|
|
Yo dawg, put the milk down and answer our questions, that shizzle ain't good for you anyways :p
|
|
|
|
I'd by the lot at 220 each. If any of them are sapphires I want nothing to do with them 6 months of mining and those fans are almost certainly almost dead. You're lucky if they last 3 months.
Bullshit. I have had Saphire Vaper-x 7950's running for 8 months and the fans are still kickin ass as I type this. I have 12 of them and not a single one has messed up. On the other hand I had a MSI that went to shit. While results my vary the poster you responded to was correct, the sapphire fans are pretty weak, and failure of any fan is to be expected (especially these) if you look at the build quality of the fans. They are thin flimsy fans with cheap sleeve bearings, certainly not up to the task of 24/7 mining like we use them for. The fact your's are at least spinning also doesn't prove they are in good shape or functioning properly. I have many spinning fans on my sapphires that are on their last legs and in failure mode. Just be prepared when they fail in the worst possible time during a hot spell in the summer. |
|
|
|
|
Would like to get more info on the make / brand of these, could you please provide at least a detailed breakdown of that. Then I can send you an offer. Thanks.
|
|
|
|
Thanks, I've yet to pick them up in person, but will report back if I find any btc stuck on any of the cards |
|
|
|
|
Sent you a offer via pm, thanks.
|
|
|
|
|
Payment sent, thanks in advance.
|
|
|
|
Sent offer in for .91btc shipped to 98230. Thanks.
Accepted 0.91 BTC 18mCZfVMRSjeqhauRNY9d7aFf1f2EWSuHC Payment sent Network TXID: 1c661a0b3f49e1bfb67d292411466583a96ba016e51720b9abb5504cc760d457 will PM my contact. Thanks. |
|
|
|
|
Sent offer in for .91btc shipped to 98230. Thanks.
|
|
|
|
|
Feedback received for marketplace trades / deals and or mining rig rentals, thanks guys.
|
|
|
|
The distro block is built into these boards. The simplest solution is to run a cable from there straight to the device; that saves connections and adapters and stuff. If you need to power a few hundred devices, wrangling exactly one wire per device is a whole lot easier and that's currently what we're looking at.
I'll probably focus on making 16AWG available alongside the boards once everything's ironed out.
Exactly right, simplest and best is to go direct from your distro boards directly to the GPUs, but you will be limited to maybe 3 or so feet until voltage levels start to drop off to unacceptable levels, even with 16AWG wiring. The only way to solve longer runs is by using heavier AWG from the distro board to an intermediate block or connector and from there out to the card which of course adds cost and complexity. OR if a source can be found for a custom made 14AWG cable with PCIe pin for a direct run from distro block to GPU's.
*OOps I was forgetting the fact that there are 3 x 2 12V lines running to each GPU, so disregard my earlier comments, just go with 16AWG and be happy. Adding up the 6 12V lines that run to each GPU means the total diameter is about equal to running between a 0 and 1AWG cable to each card. So if you wanted you can run over 20' with very little drop in voltage.
Looking at the numbers again 18AWG (x6 per GPU) is equivalent to running between 2 and 3AWG cable so even it is more than sufficient for up to at least 10' |
|
|
|
|
I hear your point on the evaporation, it will be interesting to see how that plays out. The health effects of the stuff are not known at this time either.
For the cooler, I'm pretty sure no chiller is necessary, since it only needs to be cooler than the boiling point of the fluid itself, for example if the fluorenert boils at 56 degrees then any loop with a radiator and pump (assuming you don't live in a very hot dessert) would be able to cool it below these levels so it would condense back.
My plan was to use cold tap water flowing through a copper coil, which in this part of the country is always cold throughout the year. No added infrastructure cost, no radiator would even be necessary.
|
|
|
|
I want to say I saw "special" crimp pins on digi that were purpose made for certain wire gauges. Maybe there are ATX crimp pins with longer wings for larger gauge wire?
I know the EVGA 1.5k supernova I have uses special crimp pins, they have a super wide flange that crimps down onto the individual wire sleeving so they don't have to use heatshrink. I've also often wondered how the double stacked wires on a single pin work, from the few I've looked at it seems they are just much better at cramming two wires, holding the pin, and crimping it all clean than I am, because the pins look the same...
It may be very possible, someone would have to source those larger pins if they do exist. If we can get manufactured 14AWG wires directly though that would likely be the most economical. Each of the PCI-e wires doesn't need to be 14, that's crazy. I'm running 12awg from the power supply to 8" from the cards, where they split off into 4 pci-e connectors with standard 18awg wire. 18awg can handle a lot of power in short length.
Right, this is what I've done with my rigs, 10AWG from the power supply x 4 per polarity (yes its overkill, 2 or 3 would have been fine) from there to a distribution block, then 14AWG x 2 to an 8 port push connector (one for each polarity) for each graphics card, leaving the push connector to the card I use the 16AWG cables. |
|
|
|
I'd be fine with 16AWG; all my stuff is currently running on 12 inches 18AWG which is too dern small but it's what I had. 14AWG was requested, so that's what I'll deliver to the requestor. He's been smoking 18AWG wires.
I understand, and I've had problems with burnt 18AWG connectors myself, usually only a problem with those PCIe splitter connectors 1 in 2 out though. My point about the 14AWG though was it is likely physically impossible to use 14AWG directly from the power supply to the PCIe connector itself, as the individual pins will have a lot of trouble accepting that size AWG. *edit OK I've gone ahead and attempted to crimp a 14AWG wire, I had a lot of trouble and messing with it but did manage to crimp it, wasn't pretty and damaged part of the connector that holds the wire in place, so unless there is a source for some kind of special larger pin, I really think 16AWG is the practical limit, at least with the standard PCIe pin which I have here.  |
|
|
|
What is the solubility of water in these fluids?
The cooling fins are going to condense a non trivial amount of water along with Flourinert so you will either need to separate the water out of the tank, or actively extract it from solution.
Also with a non-pressurised 2 phase system, you will lose an appreciable amount of fluid each day. That will dramatically increase your operating costs and worse, make every nearby surface an oily mess.
You would be better off immersing the cooling radiator, using a circulation pump and sticking with a single phase temperature zone. Even with those conditions you will have trouble with losses of oil and mess due to surface tension driven creep of the oil on cables and pipes entering the tank.
If you have a look at the 3M site they have a lot of interesting pics including the answer to your question of water solubility. Basically its like the reverse of water / oil, in this case the water floats on top of the flourinert, they don't mix at all. So the way to combat water would be to have desiccant granules in a packet hanging in the case should take care of any water problems. According to 3M losses to evaporation should be next to nil, but I suppose it means you need to accurately size the condenser radiator for the heat source its cooling, otherwise yes, likely to have some losses. http://www.mgchemicals.com/downloads/3m/3m-FAQ.pdfLittle bit confused about talk of oil. Are you referring to mineral oil cooling now or compressor oil in a cooling loop? Flourinert product is not an oil, its not hydrocarbon based. The advantage of the flourinert over mineral oil is it can cool more much hardware per sq in than any other known method at the moment, plus its completely inert. It is desirable to have it change phase because it cools more efficiently and there is no need for a pump, at least not inside where the hardware is immersed. The downside of course is its cost. |
|
|
|
I had a cables contact already, getting bids from him for production which is, unfortunately, overseas. I'd prefer domestic manufacturers, and Cheshyr is following up on some leads for me in that neighborhood. The initial batch's primary customer has requested 24" 14AWG, and I figure having spades crimped on the other end will be really handy.
Hmm I think you will have problems being able to use 14AWG for PCIE cables because the PCIe pins themselves really only accept up to about 16AWG. All the wiring on a standard store bought power supply that I've seen is 18AWG (for PCie) so to use 16AWG its already a pretty tight fit. For a distance of 2 feet 16AWG is adequate, the bladecenter supply also puts out 12.2V so that helps too. To go longer you can use 12/14AWG from power supply to a push connector or marrett and then from there 2 feet of 16 or 18AWG PCIe cable. Becomes much more work and not as pretty though. You've probably seen this but you can always check out this handy calc if you're not sure or want to use longer size wiring. http://www.powerstream.com/Wire_Size.htm |
|
|
|
|
