Thank you for info.
That makes totally sense and after desoldering indeed, "tokuda" is written on it.
Just for reference whomever reads this post in future: my A(B)2000 Rev.6 motherboard which came with tokuda tower soldered on has LH64258 (120ns, SHARP) memory chips. According to some datasheet they are "static" type hence the need for the "tokuda tower" fix.
Now it is clear, since I plan to use regular fastpage dram chips on my new A2000 build, I just install the regular U540 and U541 chips according to schematics and ignore the tower build.