Cray J932SE (was Re: Straight 8 up on Ebay just now)

Swift Griggs swiftgriggs at
Tue Jul 19 13:04:52 CDT 2016

On Tue, 19 Jul 2016, ethan at wrote:
> The Cray is single phase, the only thing I've ever owned that was 3 
> phase was the laser stuff. Now my solid state laser projector uses 100 
> watts and producsed half the power of the argon that used to take 3ph @ 
> 30A (and still tripped the breaker sometimes.)

I haven't been able to articulate anything witty, but I'll go ahead and 
just say: Ethan I don't know what you do with those BF-lasers, but it 
sounds damn awesome, anyway. Your stock just went up. It's hard to make 
lasers anything but sci-fi radical coolness.

> I've heard sometimes the utility will indeed give you 3phase but you 
> have to pay them to replace the transformer and it's very very 
> expensive.

Yep. It's happened in every case I've been involved with here in Colorado 
(ie.. residential or small buildings, not in data centers).

> Normally it's people buying used milling equipment that are after it 
> from my experience. There are rotary converters and solid state 
> converters but probably not ideal for huge loads.

... and as I mentioned before, they can break. So, even if your VCF will 
handle the load, your uptime requirement might be a dealbreaker if you 
have commercial intentions.
> The Cray uses 5 x Pioneer magnetics power supplies that I believe are 
> identical to those in the Sun E10000.

"back in the day" I was a certified (not as an FE, though) in various ways 
for the E10k, E15k, and E25k. We had several at Oracle when I worked 
there. However, I don't remember that detail (the brand of the PSs). I'm 
sure you are right, though.

> Note - in the modern datacenter in the US it's not uncommon for 
> everything to be run on 208, but everything would run on 120.

Yep, that's my experience, too. Although many telco datacenters still use 
DC. They are funny like that.


More information about the cctalk mailing list