These are two Samsung DDR2 SDRAM SO-DIMM modules (200-pin laptop memory sticks) from around the mid-2000s.
Top Module (Part Number: M470T6554CZ3-CD5)
• Capacity: 512 MB
• Configuration: 2Rx16 (dual rank, 16 chips)
• Speed: PC2-4200S (DDR2-533 MHz effective clock rate)
• CAS Latency (CL): 4
• Voltage: 1.8V
• Type: Non-ECC, unbuffered
• Other details: Made in China, date code around 0647 (likely week 47 of 2006)
Bottom Module (Part Number: M470T2864QZ3-CE6)
• Capacity: 1 GB
• Configuration: 2Rx16 (dual rank, 16 chips)
• Speed: PC2-5300S (DDR2-667 MHz effective clock rate)
• CAS Latency (CL): 5
• Voltage: 1.8V
• Type: Non-ECC, unbuffered
• Other details: Made in China, date code around 0811 (likely week 11 of 2008)
Both modules are standard DDR2 laptop RAM, compatible with systems supporting DDR2 SO-DIMMs (e.g., many laptops from 2005–2010). The main differences are capacity (512 MB vs. 1 GB) and speed (533 MHz vs. 667 MHz). Faster RAM (like the 1 GB stick) can often run at slower speeds for compatibility, but mixing them in the same system may force both to operate at the lower speed.