My Vaio VPCEA1BGN has Memory Type: DDR3
[2GB] PC3-10600 DDR3
[1GB] PC3-8500, DDR3 (non-ECC).
There is no extra free slot now. I am planning to change one ram to 4GB.
which one RAM i should remove now. I am still confused over the ECC types. Any suggestion while i am buying the ram?. I am looking into Corsair or Transcend.
Maximum It can hold 8GB [2*4GB]
The Crucial scan tool gave the Report as: http://www.crucial.com/systemscanner/viewscanbyid.aspx?id=28AC5F1531D926C3
I am using Win7 Professional 64Bit.
Answer
@Hennes is correct. Use non-ECC RAM in your laptop.
@Ramhound is partially correct. Compatibility is not an issue in 95% of scenarios. You can have RAM of different sizes with no problems. The primary reason you should use two sticks of RAM from the same vendor of the same size and speed are for dual channel performance benefits. Vendors usually sell dual channel kits, which are nothing more than two sticks of the same size and speed RAM which are from the same production run.
Also, please note that even this may not be necessary, depending on your motherboard's memory controller. Intel has a mode called Flex Mode on certain chipsets which can utilize dual channel with different size memory sticks.
Ultimately, you need to look into your motherboard's chipset to see what types of memory configurations it supports--dual channel, flex mode, etc.
If you don't care about the benefits of dual channel configurations, then the speed and size of the new stick does not matter. The motherboard will use the LOWER of the two speeds, however.
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