I have worked with both Supermicro and Tyan extenively. I voted for Supermicro.
I have seen too many Tyan's that needed to be retuned. Heck, I bumped into a guy at FedEx doing a Tyan RMA one time only because I recognized the box...I thought it was funny, but they have very poor quality.
I have never seen a Supermicro that need service.
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Exclusively Tyan here now, although sometimes getting enough stock can be an issue - but it's even worse trying to get SM in the UK (It's not great trying to get a decent full range of anyones kit over here).
I put my vote on Supermicro. Having built roughly 20000 units over the past 4 years they are an outstanding quality.
However their lack of management skills in the corporation are getting flakier by the moment.
Their managers that oversee Asia-USA shipments are nearly non-existant in that company. Takes weeks sometimes to get enough of the parts in to build a full machine. Thats just my 2 cents.
Yes, their supply and availability issues have been hampering us for the past two to three months now. It's getting highly annoying.
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Supermicro chassis are decent, but it depends on the application (while I love the blowers on the SC813 series, they maintain consistent operation under blockage and pressure, they could certainly move more air).
However, Supermicro rails are garbage. Over engineered IMHO, they should take a page from Evercase's book on that subject.