Lenovo ThinkPad T400 (2765-21G) - RAM Upgrade Guide
The Lenovo T400 (2765-21G) laptop has two memory slots available for RAM upgrades. It can support a maximum of 4GB of memory. The type of RAM compatible with this model is DDR3 SDRAM, and it comes in the SODIMM form factor, which is a compact design used in laptops. For optimal performance, the recommended RAM speed is 1066MHz, often labeled as PC3-8500.
Lenovo ThinkPad T400 (2765-21G) Memory Specifications & Maximum RAM Capacity
| Specification | Value |
|---|---|
| Laptop Model | Lenovo ThinkPad T400 (2765-21G) |
| Total memory slots | 2 |
| Maximum RAM | 4GB |
| 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 (2765-21G) RAM
How much RAM can I put in my T400?
Maximum is 4GB total. You've got 2 slots to work with, so that's 2x2GB sticks if you want to max it out.
What type of memory does the T400 use?
DDR3 SODIMM - the laptop-sized sticks, not the full desktop ones. Make sure you get DDR3, not DDR2 or DDR4.
What speed RAM should I get?
1066MHz (also called PC3-8500) is what works best. You might find 1333MHz sticks but they'll just run at 1066 anyway.
Can I mix different RAM sizes?
Yeah, you can do like 1GB + 2GB if you want 3GB total. Just know that dual channel performance is better with matched pairs.
Do I need to remove the old RAM first?
Depends what's already in there. If both slots are full and you want more, then yes. If there's an empty slot, just add to it.
Is 4GB enough these days?
For basic stuff like web browsing and office work, it's workable. Modern Windows 10/11 will be sluggish though. This laptop's from 2008-2009 era, so expectations should match.