whats the difference in theses two memory sticks?

KINGSTON KVR333X64C25/512 512MB 32x64 PC2700 DDR RAM (better than 2100 2400)
6 Layers High Quality Board; CL 2.5; 184-Pin Unbuffered. Requires DDR supported Motherboard - Lifetime Warranty through Manufacturer

OCSystem 512MB PC2700 DDR SDRAM, 333MHz, PC2700, CL2.5/CAS 2.5, PC2700 333MHZ! 64x64, 2.55V, Non-Parity, Non-ECC, Unbuffered, 184pin. Heat spreader included.

32X64 and 64X64 what is the difference?