In switched mode, the z750 has a single rail 12v @ 62.4A which equates to 748.8W. In standby mode it is 3.3v @ 5.5A which equates to 18.15W

And when the push stock S3 fan ramps up to 3600 rpm .... (first time I've noticed it at night!) temps fall to 40, 43

No I have not and it is running on the default voltage setting, but now that you mention it (and I am sure I have adequate power and cooling), I'll look into changing / setting different voltages.

I use 2 550W Dell server PSU's, one for each blade.

Fan mod
1. Thermalright 130CFM pull - fan is PWM but run with blue wire hack, aka full pelt)
2. Stock S3 fan running on PWM - push

This is a strange setup, during the day when it is a bit warmer, the push fan (stock S3) runs at higher RPM (3600 max I've seen) and I get temps of 44 and 46.
Freq 412.5

Nope, batch 5 is now / still available ...

Now that you realise your nonsensical comments to be that ... do as you wish. Just don't delude yourself that you know it all, if anything, bitchie dogie.
PS. That heatsink mod I described above was accomplished with no more than a power drill, snips and the trusty dremel that I used for tapping the holes ... so there you have it!

And this is what you take to be an attack?


At least you do not distance yourself from bitchie .... you 2 are one and the same .... but like I said, if you find heatpipes difficult, leave it to those that don't. You do not have to throw in your 2 cents into any and everything all the time, mostly with your ignorance.

For starters, my suggestion was a self moded copper heatsink, and I speak WITH experience here as I have a few aluminium slab + copper fins heatsinks that I made myself. The fins were made from split copper tubes and attached to the aluminium using screws and heatpads. Whether it costs more or not, you have no way of telling and therefore are not in a position to add any value to the conversation, thus has nothing to do with you.

Millionaire at 13, went to MIT and left to work in family machine shop programming CNC's and wire EDM's bitchie dogie .....

What on earth has it to do with you (dogie and bitchie) if it costs more or is hard to fabricate? This is a case of nit-picking gone mad. The initial post was somebody wondering whether a copper heatsink would work better, and I actually concur with them as copper is a better heat conductor than aluminium, but of course (EVERYBODY KNOWS THIS!) more expensive.

And for a person who claims to have worked in a family machine shop, apparently programming CNC mills and wire EDM's, this has to be a walk in the park! But hey, there have also been claims of people being millionaires at 13 and I would not be surprised if the two (pathological liars) are the same person.

You've raised your ugly head again .....
If you find dealing with heatpipes difficult, leave it to those who don't (both in practice and comments). No one asked you to add these to your homebrews, and unlike you, most people are not penny-pinching skinflints ....

Ofcourse, you need tools (that's a no-brainer) ... a dremel would be a good start .... but definitely not a task to be undertaken by feeble minded at DIY. But like I said, not that hard (does not mean it is easy!)

Should not be that hard to fabricate on your own .... just need to find out what thickness of the copper slab to get, slice some slots / channels in it and then split a few copper tubes to for the fins that are slid into the slots. All you are left to do is drilling tapped holes for attaching the PCB. I wonder how cost efficient it would be though for just a handful of units ..... ?

That would be nice if they include the VAT / import duty payments and the courier charges in the shipping cost to the UK, so all we are left with is signing for the item on delivery.

PS. Where did you see that quotation?

Who's stopping you from saying what you prefer, semantically insubstantial though it may be? Just don't expect the rest of us to be in the same boat as you.

More semantics than anything of substance. Luck is the lay man's term for probability and has nothing to do with superstition. And chance, well, that's just luck!

It is just inside 90 days, so I'll send an email to the above address and see what comes of it. Not sure what the wording should be in the email though (seeing it was info@bitmaintech.com who told me to get one from the local market) .... I'd like to get a replacement fan as the shipped one was a DOA .... would that suffice?

Better late than never .... but I am not based in the US, rather the UK, so it may be tricky for me to send you the dead fan (which I still have and looks pristine next to the others I salvaged from my now decomisioned S1's!). If on the other hand you can send me the replacement without me having to meet the cost of mailing you the dead one, I'll be more than happy to furnish any info you require.

Not sure you are thanking me, but I'll accept anyway; You are welcome.
The 52 refered to is the top temp, i.e with that configuration, the temps never go above 52 during the day (and currently  below 48 at night). I actually believed 52 was a brilliant top temp, but I've not had a different temp to compare with as my S5 shipped with a stone dead fan that never turned a fin in anger! I was advised to buy one from the local market (without any hint of irony or any offer for a replacement .... not even a voucher offer!).

There are 179 pages in just this thread, and hundreds more (if not thousands) where your so called important information has been exhaustively commented on. You seem to be on a new account (not sure that equates to being new here), so before you castigate anyone and / or lay claim to being the clearest mind on the forum (I concur, being here can muddle your thinking), we are all eyes for your pearls of wisdom!

Give me your number ... I'll call you, maybe!
One way you'll be involved, I don't have to tell you what the other way will be (I think).