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Dual Xeon Cruncher Build

[Ion]

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So I'm finally getting around to putting together something else interesting (no, the endless i5 HP SFFs don't count) so I might as well do a build log. Parts are:

- 2x Xeon X5672 (3.2GHz + turbo, quad-core + HT, LGA1366)
- 6x2GB DDR3-10666 RAM. More than enough for what I'm working on here
- 550w AcBel PSU from an old Sun workstation. Not very modern of efficient, but with 375w available @ 12V, it should do just fine. It's going to require a bit of modification, which I'll get to later
- 160GB HDD from Stinger608. Thanks! :toast:
- Supermicro X8DTi-F (almost certainly, just waiting to hear back if my offer on Ebay was accepted)
- nVidia Quadro 400
- 2x Supermicro heatpipe copper coolers
- Either Server 2008 R2 Enterprise or Linux Mint
- Caseless for now, but if I can find a decently-priced eATX case I might have to snap one up

First issue: the AcBel PSU only has a single 8-pin EPS12V. However, I salved the EPS12V plug off of a past trashed PSU (perhaps the 300w Antec I burned out running the FX8350, but I don't remember). There is a lab here with a soldering iron + supplies, however, that I believe is open to all electrical and computer engineering students. I'm heading there tomorrow to see if I can use it, in which case I'll solder the extra EPS12V plug on. If not I'll cut up a Molex->PCIe power adapter and tape them together. That's not going to be my first choice, however

(and yup, that's my Model M; a damn fine keyboard!)



I'm still waiting on most of the parts; I have the RAM, GPU, and PSU, but that's it ATM.
 

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subbed
 

[Ion]

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t_ski

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[Ion]

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t_ski

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Oh, I figured it would be, but if you can find one of them cheap, jump on it. The best part is that they are regular ATX, so they fit in just about any case.
 

[Ion]

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Oh, I figured it would be, but if you can find one of them cheap, jump on it. The best part is that they are regular ATX, so they fit in just about any case.
Yeah, regular ATX would be awesome so I could stick it in another old (and cheap) ATX mid-tower like the 2600k and 3770k, but what I'm planning on doing is putting the FX8350 in a case and then running the dual-Xeon caseless on the shelf where the FX8350 has been.
 

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[Ion]

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This 550w XFX psu has 2x 8pin connectors for $60.99

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013

I wouldn't trust that old psu too much... may be good for toasting marshmallows though!




There is also an 8 pin EPS splitter available for $10.99
http://www.newegg.com/Product/Produ...012&cm_re=eps_splitter-_-12-706-012-_-Product

Will at least save you from a soldering and taping project ;)
Well, the PSU was running a dual Socket 940 Opteron system until about a month ago and did fine there. And it doesn't feel light and hollow like cheap PSUs--old it may be, but it's quite heavy as well.

Taping I really don't want to do--but soldering is fine. I've soldered a bunch of things over the years (including soldering the power jack back together on my sister's laptop and the fan on my laptop) and I think that I can get a decent result. I'll see what I can manage tomorrow and decide from there. And since the DC draw should be just under 250w I'd imagine I'll be OK. But that XFX PSU is quite cheap.
 

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Alright, PSU has been soldered and the two 8pin 12V plugs work (tested with the multimeter in the electronics lab at least). It's not pretty, but it gets the job done. I'll take a picture later today :toast:
 

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you could very well end up overdrawing the rail on the PSU
bad idea @[ion] never skimp on the psu and certainly never rewire one ... if the board requires two EPS8 that means double the AMPs you try and draw power for both processors over one EPS8 line and the results could be very bad
get the xfx @Norton linked
if that old psu blows it will probably take everything with it
 
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There's also the Evga 750 watt 80+ bronze for $60 @ the egg. Which happens to be the one I am going to pick up at some point soon for my dual 1366 rig. It is going to start life with a 650 watt unit.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817438021



Also I learned my lesson with using old outdated psu's in crunching rigs when I took out the psu, gpu, and a mobo a couple years back with an old outdated 500 watt unit. Never again. All my rigs have very good psu's in them. (Corsair/ Antec 80+)
 
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Personally, I'd be worried about the fire hazard. I don't know how likely that is, but regardless, I wouldn't want to take the chance. If anything ever happened, you'd get blamed for it - especially given how many rigs you have running. I think you might want to slow down or even maybe take a step back. It's one thing to be dedicated but there IS such a thing as going too far.
 

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Personally, I'd be worried about the fire hazard. I don't know how likely that is, but regardless, I wouldn't want to take the chance. If anything ever happened, you'd get blamed for it - especially given how many rigs you have running. I think you might want to slow down or even maybe take a step back. It's one thing to be dedicated but there IS such a thing as going too far.
the risk of fire is fairly low server grade PSU's have OCP in the event of a dead short it will simply power off
 

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Alright, so here's what I did:

I took the new 8pin and split its wires in half; half are spliced into the existing 8pin plug and the other half are hooked up to two Molex plugs. The PSU has three 12V rails; a 16A, a 17A, and a 8A. I'm assuming that one of the 16A or 17A is going to the existing 8pin. 16A would be barely enough for two CPUs (16x12 = 192W, two CPUs = 190W). But running a CPU and a half on 16A seems fine, and I can run the other half of the CPU off of the Molex plugs.

It seems like this should be fine; I've run a pair of GTX470s and an OCed i7 on a 600w before (albeit, a new one)--and this is certainly far less power consumption than that setup. The GTX470s are approx 150W each folding, and the CPU was ~100W (4.4GHz Sandy), so that's 400W DC for the CPUs+GPU; this will be ~190W tops.
 
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Hey Ion a little side thing I use heat shrink instead of tape. Cleaner and safer then tape.

 

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Hey Ion a little side thing I use heat shrink instead of tape. Cleaner and safer then tape.

Yeah heat shrink would have been better, but all I had was electrical tape. Electrical tape + cable ties (got a few more to put on) should get the job done.
Does this really seem like such a horrible way of doing things? Obviously I don't want a fire, but I also don't want to pay for a new PSU...
 
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For me I would at the very least go back and use heat shrink. Tape seems to lossen up and fall off with heat. When I am wiring cars up I always use solder (which you did :toast:) and heat shrink. You do not want any chance of a short in there as it can take out the whole rig. Your work doesn't seem botched. I just tend to be overly cautious on stuff. Hence the reason I err to the side of over kill with psu's
 

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For me I would at the very least go back and use heat shrink. Tape seems to lossen up and fall off with heat. When I am wiring cars up I always use solder (which you did :toast:) and heat shrink. You do not want any chance of a short in there as it can take out the whole rig. Your work doesn't seem botched. I just tend to be overly cautious on stuff. Hence the reason I err to the side of over kill with psu's
Alright, well that makes me feel better. I think what I'll do is put on extra cable ties to make sure that the tape doesn't come off--two cable ties over each piece of tape ought to do a solid enough job--and then I'll pick up heat shrink (almost certain I have some at home at my parents house) over winter break and heatshrink it then. Lots of cable ties ought to do a sufficient job if I keep an eye on it for the short term.

Also, I think I"ll plug it into my FX8350 + 8800GTS system and run it like that for a bit, that ought to give me an idea of how it'll do. The FX8350 + G92 GTS ought to be similar power draw to the two Xeons.
 

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how are you not blowing every breaker in your house [ION]
If my math is correct you are close to pulling over 80AMP's on all your systems
 

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how are you not blowing every breaker in your house [ION]
If my math is correct you are close to pulling over 80AMP's on all your systems
I dunno how you get 80 amps....no way it's close to that. Running on a single 20A breaker, I have: Xeon X5670 system, 2720QM system, OCed 3930k system, AMD 4P, ULV i7, OCed FX8350, OCed 2600k, 3770k, Atom, two i5-2400s, and a 4702QM. How that all is less than 20A I don't know, but apparently it is.
On a separate 20A circuit is another i5-2400, an i7-860, an i7-4770. The i5-520m is on yet another circuit. As is the i7-920. The i5-4690k is on another circuit as well.
 

OneMoar

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at 100% load using a low avg peak of ~8 amps per machine thats what I came up with lol
so either your machines draw well under 8 amps while crunching or the outlet is a lot beefier then you think it is ..
even at 3 amps per machine witch is really unrealistically low that's still 50AMP's
*counting all the machines you have listed in your sig
 
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[Ion]

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at 100% load using a low avg peak of ~8 amps per machine thats what I came up with lol
so either your machines draw well under 8 amps while crunching or the outlet is a lot beefier then you think it is ..
even at 3 amps per machine witch is really unrealistically low that's still 50AMP's
No way it's 8A. Absolutely no way. For most of them, it's not even 3A. The three mobile i7 systems are less than 1A AC each. The i5s are about 125W AC (HP builds them using 80+ Bronze PSUs, and there's barely anything in them other than a CPU). The 3930k system is probably about 3A (don't remember exactly), and the AMD 4P is very approximately 4A. The other assorted systems (X5670, FX8350, 2600k, 3770k, 860, 4770) are all 2A or just barely over.
 
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@OneMoar , are you forgetting to convert between 12v and 120V? 8 amps at 120 volts is 960 watts (if I remember my electrical math correctly)
 

OneMoar

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I was talking at the wall ac-draw
 
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