Asus K40AC - RAM Upgrade Guide
The Asus K40AC laptop has two memory slots for RAM upgrades, allowing for a maximum capacity of 4GB. It uses DDR2 SDRAM, which comes in the SODIMM format, a smaller type of memory module designed for laptops. For best performance, the recommended RAM speed is 800MHz, often labeled as PC2-6400.
Asus K40AC Memory Specifications & Maximum RAM Capacity
| Specification | Value |
|---|---|
| Laptop Model | Asus K40AC |
| Total memory slots | 2 |
| Maximum RAM | 4GB |
| Memory type | DDR2 SDRAM |
| Form factor | SODIMM (Small Outline Dual Inline Memory Module) |
| Recommended RAM clock speed | 800MHz (PC2-6400) |
| Voltage | 1.8V |
| Number of pins | 200-pin |
FAQ about Asus K40AC RAM
How much RAM can I put in my K40AC laptop?
Maximum is 4GB total. You've got 2 slots to work with, so that's 2x2GB sticks. The system won't recognize anything higher than 4GB even if you try to install more.
What type of memory do I need for the K40AC?
You need DDR2 SODIMM modules - the smaller laptop-sized ones, not the full-size desktop sticks. Make sure it's DDR2, not DDR3 or DDR4, as they're not compatible and won't even fit in the slots.
What speed RAM should I get?
800MHz (also labeled as PC2-6400) is the recommended speed. You might find 667MHz modules work too, but 800MHz is what the system is designed for. Faster speeds will just downclock to 800MHz anyway.
Can I mix different RAM sizes?
Technically yes, like 1GB + 2GB, but it's better to use matching pairs (2x1GB or 2x2GB). Matched pairs can run in dual-channel mode which gives better performance. Mixing sizes still works but you lose that speed benefit.
Do I need to remove the old RAM first?
Depends what's already installed. If you've got 2x1GB and want to go to 4GB total, then yes, you'll need to remove both and replace with 2x2GB sticks since there are only 2 slots total.