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Author Topic: [pics inside] custom built 8-card rack  (Read 10862 times)
BkkCoins
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August 21, 2011, 07:37:07 AM
 #61

I'm sure digikey.com will have those connectors but trying to find it will be hard without a part # or at least a manufacturer.

It may help to find a PCI Express spec page that indicates a mfr. part# first.

Googling: pci express power connector turns up some,

Also it turns up this spec which gives you the part# for digikey.

... seems digikey doesn't carry that series but mouser does and they should be easy to order from.

31 cents each.

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August 21, 2011, 05:26:45 PM
 #62

I run two PSU's. 530w and 620w (around that) to power 4x 5830's. Pulls about 720w from the wall.

Yes, it is not a good idea to run the PSU without the 5v rails loaded. The second PSU wouldnt even boot without putting a load on the 5v. SOO, I plugged it into the hard drive:) Problem solved.

For about 10-15$ you can get a handy 2xPSU adapter from frozenCPU. Yeah, its dead simple to splice, but why splice and lower the "resale" or "re-use" value?

You could also use some heavy resistors on the 5v rail. This is what they do when they're making a CPU PSU into a bench PSU. (See sandbar resistor)
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August 21, 2011, 08:21:42 PM
 #63

I'm sure digikey.com will have those connectors but trying to find it will be hard without a part # or at least a manufacturer.

It may help to find a PCI Express spec page that indicates a mfr. part# first.

Googling: pci express power connector turns up some,

Also it turns up this spec which gives you the part# for digikey.

... seems digikey doesn't carry that series but mouser does and they should be easy to order from.

31 cents each.

I have searched and gosh, the damn connector is sure not easy to go. You will have to get those square pins as well...

I think i will stick with my original plan, which is using the 4pin molex connectors, essentially turns the PSU to modular and buy molex to pci-r connectors as needed. More resistance = less efficient but probably cheapest and easier to do.


Tips gladly accepted: 1LPaxHPvpzN3FbaGBaZShov3EFafxJDG42
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August 24, 2011, 08:06:09 AM
 #64

ok it's pretty much done, i just have to connect all the wires and power it on.

i shorted the two presence pins with a small wire on each of the pci-e slots. this motherboard requires it if using pci-e x1 extension cables.


rear view


top view


front view


side view


another different angle



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August 24, 2011, 08:13:25 AM
 #65

Looks very impressive Smiley

18jL18iH96BBhwUCQn27FQp7ocodSxvJAB
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August 24, 2011, 12:15:17 PM
 #66

very nice indeed, like a piece of art  Grin
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August 26, 2011, 03:48:55 PM
 #67

Looks great.  Can't wait to hear reports on the temps of your cards.
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September 03, 2011, 09:41:42 PM
 #68

haploid can I have permission to ask trini8d to build me one using your design lay out (or may be add to it?)
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September 04, 2011, 01:36:28 AM
 #69

I must say.. very impressive! Nice work..

It has given me some ideas for a project next weekend Smiley

Mining Both Bitcoin and Litecoin.
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September 05, 2011, 12:46:48 AM
 #70

haploid can I have permission to ask trini8d to build me one using your design lay out (or may be add to it?)

ya sure, go ahead and use the design, i don't mind at all. in fact, stellan0r saw this thread and did the exact same thing but stretched it a little bit. i believe he posted pics of his version on the first page.

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September 05, 2011, 12:58:07 AM
 #71

Right, YOU CANT JUST PLUG 8 CARDS INTO THE MOTHERBOARD!!! The normal extenders supply 75 watts from the board. RUnning 4 VGA (4x75W(300W)) is the limit. Least i found. I blew a motherboard plugging 5 in it. YOu need moidify or buy extender WITH POWER MOLEX to power the cards direct from the PSU. THats why i kept my rigs below 4 and still use power molex for the 4th card as it loses performance without i found Smiley Although i dont know what all your cards are. I run 5850's.

I hope you have VERY GOOD 1000W or GOOD 1200W, i.e, Corsair AX1200, antec HPC 1200W PSU's etc, I blew a cheap one and cheap one = KNACKERED HARDWARE, i warn you now Smiley YOu thought about HEAT! i got 8 running now.well 11 with comp, and use a 12" out take fan to get rid of it. 2x4 rigs. Bottom pic on this post shows what i use for extraction of heat. its HOT! without something.

https://bitcointalk.org/index.php?topic=18567.msg494839#msg494839

New (11.6+) drivers dont need DUMMY's at the back wither with windows (if your windows). Although 10.4 with 2.1SDK is the best. CGminer and diablo.

AND FANS, you need fans mate. serious fans, them cards are close, WAY too close if you ask me. In in for a suprise i recon haha. 2 rigs of 4 mate, 2 rigs of 4 Smiley Greedy, i tried Smiley
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