Lenovo ThinkPad T400s - RAM Upgrade Guide
The Lenovo T400s 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 model is DDR3 SDRAM, and it comes in a SODIMM format, which is a compact size designed for laptops. For best performance, the RAM should have a clock speed of 1066MHz, often labeled as PC3-8500.
Lenovo ThinkPad T400s Memory Specifications & Maximum RAM Capacity
| Specification | Value |
|---|---|
| Laptop Model | Lenovo ThinkPad T400s |
| 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 T400s RAM
How much RAM can I put in a T400s?
Maximum is 8GB total. The laptop has 2 memory slots, so you can do 2x4GB sticks. That's the ceiling - won't recognize anything higher even if you try.
What type of memory does the T400s use?
It takes DDR3 SODIMM modules - the smaller laptop memory sticks, not the full-size desktop ones. Make sure you get SODIMMs or they won't physically fit.
What speed RAM should I get for the T400s?
1066MHz (PC3-8500) is what's recommended. You can technically use faster RAM like 1333MHz, but it'll just run at 1066MHz anyway, so save your money and stick with PC3-8500.
Can I mix different RAM sizes in the T400s?
Yeah, you can mix sizes like 2GB + 4GB if needed. Works fine, though matching pairs (like 4GB + 4GB) might give slightly better performance. The system will run them in single channel mode if they're mismatched.
Do I need to remove the old RAM when upgrading?
Depends what's already in there. If you've got 2x2GB and want 8GB total, then yes, take both out and put in 2x4GB. But if there's just one stick, you might be able to add a second one to the empty slot.