Lenovo ThinkPad T400 (7425) - RAM Upgrade Guide
The Lenovo T400 (7425) laptop can be upgraded to enhance its memory capacity. It has two slots available for RAM, allowing a maximum capacity of 8GB. The type of memory used is DDR3 SDRAM, and it comes in a SODIMM format, which is a compact design suited for laptops. For optimal performance, the recommended clock speed for the RAM is 1066MHz, often referred to as PC3-8500.
Lenovo ThinkPad T400 (7425) Memory Specifications & Maximum RAM Capacity
| Specification | Value |
|---|---|
| Laptop Model | Lenovo ThinkPad T400 (7425) |
| 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 (7425) RAM
How much RAM can I put in a T400?
Maximum is 8GB total - that's 4GB per slot since there are 2 slots available
What type of memory does the T400 use?
DDR3 SODIMM - the laptop version, not the desktop sticks. Make sure you get the smaller laptop memory modules
What speed RAM should I get for the T400?
1066MHz (also labeled as PC3-8500) is the recommended speed. Higher speeds will work but will just run at 1066MHz anyway
Can I mix different RAM sizes in the T400?
Yes, you can use different sized modules like 2GB + 4GB, but matching pairs (like 4GB + 4GB) will give you dual channel mode for slightly better performance
Do I need to remove the old RAM when upgrading?
Depends on what's already installed. If you have 2x2GB and want 8GB total, you'll need to replace both with 4GB modules since all slots are already occupied
Is upgrading the RAM on a T400 difficult?
Pretty straightforward - usually just need to remove a panel on the bottom, pop out the old modules, and click in the new ones. Takes about 5 minutes