Lenovo ThinkPad T400 (7434) - RAM Upgrade Guide
The Lenovo T400 (7434) laptop has two memory slots available for RAM upgrades. It can support a maximum of 8GB of memory. The type of RAM compatible with this device is DDR3 SDRAM, and it uses a small outline dual inline memory module (SODIMM) form factor. For best performance, the recommended RAM clock speed is 1066MHz, which corresponds to the PC3-8500 standard.
Lenovo ThinkPad T400 (7434) Memory Specifications & Maximum RAM Capacity
| Specification | Value |
|---|---|
| Laptop Model | Lenovo ThinkPad T400 (7434) |
| 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 (7434) RAM
How much RAM can I put in a Lenovo T400?
Maximum is 8GB total. The laptop has 2 memory slots, so you can install two 4GB modules to reach the max.
What type of memory does the T400 use?
It uses DDR3 SODIMM modules - these are the smaller laptop-sized memory sticks, not the full-size desktop ones.
What speed RAM should I get for my T400?
Look for 1066MHz DDR3 (also labeled as PC3-8500). The system might accept faster RAM but it'll just run at 1066MHz anyway.
Can I mix different RAM sizes in my T400?
Yes, you can mix sizes like 2GB + 4GB, but for best performance try to match the modules. Same size, same speed works best.
Do I need to upgrade both RAM slots at once?
No, you can upgrade one slot at a time. Just check what's already installed first - might already have one or both slots filled.
Will faster RAM like 1333MHz work in the T400?
It'll physically fit and work, but the system will downclock it to 1066MHz. Save money and just get 1066MHz modules.