QuoteAsus reveals pro-grade Mac Studio rival mini PC: Nvidia RTX Spark

Not a rival: A NVIDIA Spark is based on a NVIDIA's GB10 chip (273 GB/s) (en.wikipedia.org/wiki/Blackwell_(microarchitecture)#Blackwell_dies), while a Mac Studio is/was based on Apple's M4 Max (up to 546 GB/s) or M3 Ultra (819.3 GB/s) chips.

Unfortunately Apple doesn't sell higher RAM configs anymore:
en.wikipedia.org/wiki/Mac_Studio: "Configurable up to 512 GB until March 4, 2026;[30] 256 GB until May 5, 2026[31]".

If the Spark had 192 GB or 256 GB RAM configs, then even with the lower GB/s one might call it a rival, because at least then it would have more RAM than a Mac Studio.

"retail prices and expected availability" - since these are all paper launches, we have no specifics yet. It could be late 2026. It could be early 2027. Pricing-wise, for machines with the top Spark chip, I don't think you are looking at less than 1.5K USD but don't quote me on that.

Astronomical, therefore undisclosed.

What are the retail prices and expected availability date(s)?