CREATE TABLE table_6237 ("Designation" TEXT, "Bus width  ( bits ) " FLOAT, "Channels" TEXT, "Clock rate  ( MHz ) " FLOAT, "Bandwidth  ( MB/s ) " FLOAT)

Designation of pc800 has which highest Bus width (bits)?
SELECT MAX("Bus width (bits)") FROM table_6237 WHERE "Designation" = 'pc800'
SELECT MAX("Bus width (bits)") FROM "table_6237" WHERE "Designation" = 'pc800'