|Modules compatible with Asus M2N-E|
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CT2KIT25664AA80E is NOT listed.
CT2KIT25664AA800 IS listed
4GB kit (2GBx2), 240-pin DIMM, DDR2 PC2-6400 memory module
Module Size: 4GB kit (2GBx2)
Package: 240-pin DIMM
Feature: DDR2 PC2-6400
Specs: DDR2 PC2-6400 • CL=6 • Unbuffered • NON-ECC • DDR2-800 • 1.8V • 256Meg x 64 •
CT2KIT25664AA80E found on the web:
Capacity of Module in Kit: 2 GB
CAS Latency: CL5
Data Integrity Check: Non-ECC
Form Factor: DIMM 240-pin
Lead Plating: Gold
Memory Specification Compliance: PC2-6400
Memory Speed: 800 MHz
Module Configuration: 256 x 64
Module Height (inch): 1.18
Modules in Kit: 2
Registered or Buffered: Unbuffered
Storage Capacity: 4 GB
Supply Voltage: 1.8 V
Technology: DDR2 SDRAM
In the case of AM2 mboards, the memory controller is built into the cpu, and that's what the ram must be compatible with.
Despite the fact CT2KIT25664AA80E is not listed for your mboard model, if it's working fine now, it SHOULD work fine along with the CT2KIT25664AA800.
The only obvious difference appears to be CT2KIT25664AA80E is rated at CL=5, CT2KIT25664AA800 is rated at CL=6, and CT2KIT25664AA80E is usually more expensive than CT2KIT25664AA800.
If you install both sets of modules, all the ram will run at CL=6.
Would you be able to perceive the difference between CL=6 and CL=5?? Not likely. The CL rating only applies when the ram is first accessed - when it continues to be accessed, which it is the vast majority of the time, CL 5 ram runs at the same speed as CL 6 ram, if other ram specs are equal.
The amount of ram, if you actually benefit from having more, is a lot more important than the CL rating, and a lot more important than whether it is running in dual channel mode or not.
But do you actually need more ram?
You will not notice ANY difference with more ram unless you actually have programs that will run better with more ram.
Ultimate Memory Guide
How Much Memory Do You Need? etc.
After a certain minimal amount, more ram will NOT make your speed on the internet faster - that depends on the max speed of internet package you're paying for, which is much slower than the speed at which your cpmuter runs otherwise, and that's the bottleneck, not the amount of ram you have installed.
Upgrading your cpu to a faster model will make a lot more of a noticable difference than adding more ram will.