My big mining rig project
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[quote name=“svennand” post=“14119” timestamp=“1371127976”]
[quote author=ChristianRiesen link=topic=387.msg13526#msg13526 date=1371022942]
[quote author=svennand link=topic=387.msg13211#msg13211 date=1370986673]
just a heads up. my enermax maxrevo 1500w psu could not handle 5x7950 +1x7970 card…
no problem with 5x7950. but that extra card put it over the top.
not platinum rated tough
[/quote]
Thanks for the heads up. I think that exactly those two things are pushing it over the limit, the non platinum rating and the 7970. From my calculation, it should be enough, but I’ll know for certain once I have it running.
[/quote]seems that the amount of power of the psu wasnt the problem…
however it does seem that active connectors might be a good idea with 6+ cards…
http://forum.feathercoin.com/index.php?topic=1609.15
[/quote]
I intend to power all the risers on this rig :) -
[quote name=“ChristianRiesen” post=“14239” timestamp=“1371144910”]
[quote author=svennand link=topic=387.msg14119#msg14119 date=1371127976]
[quote author=ChristianRiesen link=topic=387.msg13526#msg13526 date=1371022942]
[quote author=svennand link=topic=387.msg13211#msg13211 date=1370986673]
just a heads up. my enermax maxrevo 1500w psu could not handle 5x7950 +1x7970 card…
no problem with 5x7950. but that extra card put it over the top.
not platinum rated tough
[/quote]
Thanks for the heads up. I think that exactly those two things are pushing it over the limit, the non platinum rating and the 7970. From my calculation, it should be enough, but I’ll know for certain once I have it running.
[/quote]seems that the amount of power of the psu wasnt the problem…
however it does seem that active connectors might be a good idea with 6+ cards…
http://forum.feathercoin.com/index.php?topic=1609.15
[/quote]
I intend to power all the risers on this rig :)
[/quote]I know nothing about powering risers, I haven’t even looked at picture online of a powered riser, but I assume it takes another power connection from the PSU, will you have enough PSU power connectors? or am I talking nonsense?
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Here is the thing: PCIE supports delivering a substantial amount of power over two pins at the front of the card (that’s the same no matter if its 16x or 1x). Now if you have multiple cards running, they all draw from the same place, the power pins on your board. Each one can draw up to 75W according to specs. Doesn’t take long to realize this could be a bit much for those pins there. The powered risers counter that by having a molex soldered to those two pins feeding 12V into the card. Now you can feed extra power into the card over another cable, getting some of the stress away from your motherboard. People run cards without them just fine, but the extra stress is still there. Some run for weeks without a problem and then suddenly the board fries. Others never have problems.
The consensus seems to be to run everything above 2 cards on powered risers and you should never have a problem. I will run all my cards on powered risers, and for each pair of two, have their own power cables go to the powersupply.
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[quote name=“ChristianRiesen” post=“14293” timestamp=“1371151237”]
Here is the thing: PCIE supports delivering a substantial amount of power over two pins at the front of the card (that’s the same no matter if its 16x or 1x). Now if you have multiple cards running, they all draw from the same place, the power pins on your board. Each one can draw up to 75W according to specs. Doesn’t take long to realize this could be a bit much for those pins there. The powered risers counter that by having a molex soldered to those two pins feeding 12V into the card. Now you can feed extra power into the card over another cable, getting some of the stress away from your motherboard. People run cards without them just fine, but the extra stress is still there. Some run for weeks without a problem and then suddenly the board fries. Others never have problems.The consensus seems to be to run everything above 2 cards on powered risers and you should never have a problem. I will run all my cards on powered risers, and for each pair of two, have their own power cables go to the powersupply.
[/quote]could you post a link to the powered risers you have bought?
i havent had any problems with rigs with 4 cards (good psu’s and so on). but apparently when you reach 6 cards thats alot of power trough on connector.
If it gives 75w pr slot we’re talking 450w on ONE single connector on the 24pin block. -
I bought mine directly from a manufacturer in China. thre is a site, called buyahash.com I think that sells them though.
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you can make your own quite easily if you have a soldering iron and a spare molex socket (from one of your cards molex -> pci-e power adaptors).
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But will your PSU have enough unused slots to connect all 6 12v molex’s?
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In my case yes but not all PSUs come with the number of cables mine does. You don’t [b]need[/b] 6 though you only 1 or 2 to lighten the load on the 24pin/mobo tracks.
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[quote name=“Pyxis” post=“14413” timestamp=“1371166584”]
But will your PSU have enough unused slots to connect all 6 12v molex’s?
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In my case as well. There is plenty of plugs to go around. And I plug in two risers to one cable from the PSU. As nutnut so aptly said, it’s to lighten the load. -
Cheers guys, that helps. ;)
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Hi Christian,
Any update on your rig build? or are you on holidays like most sane people. ;D
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[quote name=“Pyxis” post=“21452” timestamp=“1373721892”]
Hi Christian,Any update on your rig build? or are you on holidays like most sane people. ;D
[/quote]
Well RL has a way of creeping up. I’m working on another project that is… slightly larger. I will announce it as soon as possible.As for this, I tried now two laser cutting places and they are expensive as balls. I could hire someone to spend a week cutting these by hand for what they want. So still looking for a better cutting place.
Also made small changes:
- The rig is a bit “deeper”, as in the cards holder is a bit longer towards the back.
- The backplate no longer has holes for the IO part, thanks to the above change.
- There is a small cut near the PSU large enough to fit a AC cable through when the PSU is not installed.
These changes were made so the cables (network and power) are not in the back area (where it’s hot) but are in the front and can be routed there however you want. It also closes off the hot area even more, so all openings in the back only are there to expel heat and nothing else. If stacked and maybe even sideways arranged, this will make removal of heat inside the room simpler and not let heat spill over into places where we want it removed from.
Also should allow for standard USB sticks to be attached or at least a short extension cable to be fitted in the back ports.
As soon as I have an update, I will post it here for certain.
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Great, glad that your still working on it, pity that the laser cutting was too expensive, cutting by hand is hard work.