Nice.
I only have three flashcarts — EZ-Flash IV, EZ-Flash 3in1 and Supercard DSTwo.
I lost the 3in1 a while ago, but found it at the place I would have least expected it to be.
I got my R4 from some eBay-ish site. It was risky with what it was, but sure enough, the cart shipped out of China (I could tell easily by the packaging) and was in brand new condition upon arrival.
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi