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A basic difference between the Intel386 ABI and the AMD64 ABI is the way the GOT table is found. The Intel386 ABI, like (most) other processor specific ABIs, uses a dedicated register (%ebx) to address the base of the GOT table. The function prologue of every function needs to set up this register to the correct value. The AMD64 processor family introduces a new IP-relative addressing mode which is used in this ABI instead of using a dedicated register.
On AMD64 the GOT table contains 64-bit entries.