These are not Bitgarden boards or chips please look at photos and compare also the ship and specs are diffrent
The description refers to bitgarden multiple times.
"Bit garden to provide maintenance is as follows"
look at this:
the layout is slightly arranged, but its clearly the same design just a different revision. still, 130nm doesnt match the stated specs
VERDICT: not worth the ~2BTC pricetag (1.7-2.1BTC depending what exchange you price using) considering that it does not include a PSU, uses 130nm technology, and will only mine about 1.2-1.5BTC in its lifetime (not considering power costs). $700 would be a more realistic pricetag