Supermicro 1027GR-TRF 1U GPU Barebone - $68 shipped

[BlueFox]

Little beat up, but they're practically giving it away: Supermicro SYS-1027GR-TRF 4 Bay 2.5" 1U Server with 2x PSU 2x Heatsinks 1135276 | eBay

Bet it does not last long.

Edit: Looks like that amounts to ~5 minutes.

 

[eduncan911]

Gone

 

[Markess]

Haha...I saw this fast enough to actually buy it. But when I saw it was 1800w PSU...holy cow, its mostly power supply with a CPU or two wedged in somehow

 

[eduncan911]

Current Tesla GPUs are roughly 250-300 Watts each.

4 x 300 Watts = 1200 Watts

Leaving a normal 600 Watts for system.

Remember, Supermicro PSUs are rated/spec'd/tested at 230VAC. If running on 115/120VAC, it's a lower efficiency and lower wattage. I haven't found any exact documentation on it; but, a few posts on this forum says 50% watts at 110VAC.

This graph seems to back that up, though I am not sure why it only shows a few AMPs (and not 20A):

https://www.supermicro.com/products/powersupply/80PLUS/80PLUS_PWS-1K81P-1R.pdf

 

[eduncan911]

Could a NEMA C13 carry 20A?

15A gets you a max of 1680W. So, it would have to be on a 220V/10A or 110/20A (if 110V did get you 1800W) circuit to absolutely max it out.

 

[BlueFox]

C13 connectors are actually IEC, not NEMA, but they are limited to 10A. Supermicro rates it at 1000W at 110V and 1800W at 220V.

 

[Markess]

C13 connectors are actually IEC, not NEMA, but they are limited to 10A. Supermicro rates it at 1000W at 110V and 1800W at 220V.

I was just trying to make heads or tails of this myself. So, if I understand you and @eduncan911 ...for someone running three Kepler Teslas (which is the generation when this came out) plus a couple beefy E5 v1/v2, a single PSU running on U.S. (120v) current even at the full rated10A, it isn't going to cut it?

Since SM lists these as 1+1 redundant, do both PSUs need to team to provide 1800w on 120v., with each PSU drawing up to 10A?

I had an old system with triple redundant PSUs that did that (an old H8 system in an SC933). It only reached the rated wattage with all three PSUs active and cranking.

 

[BlueFox]

Each one can provide 1800W and I don't believe they can share load like that. I thought on the older 933 chassis, 2 of the 3 PSUs were required to achieve rated output, not all 3.

 

[Markess]

Each one can provide 1800W and I don't believe they can share load like that. I thought on the older 933 chassis, 2 of the 3 PSUs were required to achieve rated output, not all 3.

You could very well be right on the 933. I'd understood it was all three from the person who'd explained it to me, but that doesn't mean they were right!

In any case, it was interesting looking up the details on this. Definitely not the kind of gear I normally look at for my needs at home, so it was interesting to see a different side of things. Thanks for sharing it!

 

[eduncan911]

I really wish my SMX2200 UPS and managed PDUs were all 220VAC, not 110VAC.

Would love to have run 220 circuits into the server closet.

 

[eduncan911]

As far as the load sharing, from what I've read the PDUs in the SC846 and similar class chassis do load sharing. Though I've never tested it.

I only run a single 741P-SQ in the 846 (740W @ 220VAC). So that's really around a 400W PSU...

So with a ingle E5 V3s (about to be a Threadripper 2950X), and 24x HDDs. Idles at 65W via Watt meter at the wall (all HDDs spun down). CPU maxed and all HDDs spinning is 310W at the wall with 110VAC.

I JUST got a GPU adapter cable in the mail yesterday... *Grin* let's see if "load sharing" is really a thing.

Got a power hungry Kepler Titan GTX to through into it. But, it will be a few weeks until I have the time.