Lenovo ThinkPad T400 (6474) - RAM Upgrade Guide
The Lenovo T400 (6474) laptop has two slots available for memory upgrades, allowing for a total capacity of up to 8GB. It uses DDR3 SDRAM as the type of memory, designed in a compact SODIMM format, which is standard for laptops. For best performance, the memory should operate at a speed of 1066MHz, often listed as PC3-8500.
Lenovo ThinkPad T400 (6474) Memory Specifications & Maximum RAM Capacity
| Specification | Value |
|---|---|
| Laptop Model | Lenovo ThinkPad T400 (6474) |
| Total memory slots | 2 |
| Maximum RAM | 8GB |
| Memory type | DDR3 SDRAM |
| Form factor | SODIMM (Small Outline Dual Inline Memory Module) |
| Recommended RAM clock speed | 1066MHz (PC3-8500) |
| Voltage | 1.35V - 1.5V |
| Number of pins | 204-pin |
FAQ about Lenovo ThinkPad T400 (6474) RAM
How much RAM can I put in a T400?
Maximum is 8GB total - that's using both memory slots with 4GB modules in each. The laptop has 2 SODIMM slots for DDR3 memory.
What type of memory does the T400 use?
It uses DDR3 SODIMM modules - the smaller laptop-sized memory sticks. Make sure you get SODIMMs, not regular desktop DIMMs which won't fit.
What speed RAM should I get for the T400?
1066MHz (also called PC3-8500) is the recommended speed. You can sometimes use faster RAM but it'll just run at 1066MHz anyway, so no point spending extra.
Can I mix different RAM sizes in my T400?
Yes, you can mix sizes like 2GB + 4GB to get 6GB total. Just try to match the speed specs. Mixing is fine but identical pairs sometimes perform slightly better.
Do I need to upgrade both memory slots at once?
No, you can upgrade one slot at a time. If you have 2GB now (1GB x2), you could replace just one stick with a 4GB module to get 5GB total.
Will any DDR3 laptop memory work in my T400?
As long as it's DDR3 SODIMM at 1066MHz or higher, it should work. Higher speed RAM will just downclock to 1066MHz. Avoid DDR3L (low voltage) - stick with standard DDR3.