It doesn't need capacitors for the data written out to the SLC cache (storing one pit per NAND flash memory cell rather than three), which is the only cache tha

It doesn't need capacitors for the data written out to the SLC cache (storing one pit per NAND flash memory cell rather than three), which is the only cache that's actually multiple GB in size. The volatile RAM caches on consumer drives tend to be pretty small, and data is resident in them just long enough to batch together enough writes to provide good throughput.