Lenovo ThinkPad T400 (6475) - RAM Upgrade Guide
The Lenovo T400 (6475) laptop has two slots available for memory upgrades, allowing for a total capacity of up to 8GB. The type of memory it supports is DDR3 SDRAM, and it comes in the SODIMM format, which is a smaller type of memory module typically used in laptops. For best performance, the memory should operate at a speed of 1066MHz, often labeled as PC3-8500.
Lenovo ThinkPad T400 (6475) Memory Specifications & Maximum RAM Capacity
| Specification | Value |
|---|---|
| Laptop Model | Lenovo ThinkPad T400 (6475) |
| 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 (6475) RAM
How much RAM can I put in a T400?
Maximum is 8GB total. The laptop has 2 slots, so that's 4GB per slot max. Pretty decent for an older machine.
What type of memory does the T400 use?
DDR3 SODIMM - the smaller laptop memory sticks. Make sure you get SODIMM, not regular desktop RAM which won't fit.
What speed RAM should I get for my T400?
1066MHz (also called PC3-8500) is recommended. The system might accept faster RAM but it'll just run at 1066MHz anyway, so no point paying extra.
Can I mix different size RAM sticks in my T400?
Yes, you can use different sizes like 2GB + 4GB to get 6GB total. Just keep both sticks at the same speed (1066MHz) for best results.
Do I need to upgrade both RAM slots at once?
No, you can upgrade one at a time. If you have 2GB now (1GB x2), you could replace just one stick with a 4GB to get 5GB total.
Will faster RAM like 1333MHz work in the T400?
It'll work but automatically slow down to 1066MHz to match what the T400 supports. Save money and just get 1066MHz.