Asus K40C - RAM Upgrade Guide

The Asus K40C 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 laptop is DDR2 SDRAM, and it uses a SODIMM form factor, which is a smaller type of memory module designed for laptops. For best performance, the recommended RAM clock speed is 800MHz, often referred to as PC2-6400.
Asus K40C Memory Specifications & Maximum RAM Capacity
| Specification | Value |
|---|---|
| Laptop Model | Asus K40C |
| 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 K40C RAM
How much RAM can I put in an Asus K40C laptop?
Maximum is 4GB total. The laptop has 2 memory slots, so you can install 2x2GB sticks. That's the ceiling - won't recognize anything higher even if you try to install it.
What type of RAM does the Asus K40C use?
DDR2 SODIMM modules. Make sure you get laptop memory (SODIMM), not desktop RAM. The full-size desktop sticks won't physically fit in the slots.
What speed RAM should I get for the K40C?
800MHz DDR2 (also labeled as PC2-6400). The system might work with slower speeds like 667MHz, but 800MHz is what's recommended for best performance.
Can I mix different RAM sizes in the K40C?
Yes, you can mix sizes like 1GB + 2GB to get 3GB total. For best performance though, matching pairs (2GB + 2GB) usually work better since they can run in dual-channel mode.
Is it worth upgrading from 2GB to 4GB on this laptop?
Usually yes, especially if you're multitasking or using newer software. Going from 2GB to 4GB can make a noticeable difference in everyday use. Just remember this is an older system, so don't expect miracles.