Why not this one: 6.3ZLJ1000M8X16

ZLJ have a longer lifetime, higher ripple current and lower ESR. The volume must be larger of course so the hight is 17.5mm here rather than 14mm.

I saw those and am planning on ordering about 50 total once I figure which ones. On the QDI those taller ones may interfer with PCI slots but not the VRM/cpu socket area.

Between / near PCI slots there are probably just caps for local stabilisation and filteríng so YXJ are good enough there.
ZLJ are a perfect choice for (buck-) VRM circuits and if there´s enough space you can use them there.

Thanks ! I will order some of both. On a side note: I tried to re-cap an older Antec PSU with more modern low ESR caps and it did not work well. Seems they used good caps but not low ESR for some reason.
The caps on that QDI are near impossible to decode who made them, just an odd symbol barely readable 🙁

Rubycon ZLH and ZLJ are _very_ versatile. So far I didn´t encounter any problems when using them for all kinds of mainboards / VRMs, PSUs, TVs or audio-equipment.

You have to be more careful when it comes to ultra-low ESR components like polymer-electrolytics or the likes of the classic "Rubycon MBZ" in older / vintage hardware or PSU designs.