I'm intending to upgrade this old computer of mine a little, since its
Intel Core 2 Quad Q6600 @ 2.40Ghz is still modestly fast. Its 2GB
RAM A-DATA DDR2 800 I bought 3 years ago seems to be low to me.
Sometimes the virtual memory go up more than 2GB on Task Manager and
the system slows down greatly.

This motherboard has its Qualified Memory Vendors List (QVL):
http://download.gigabyte.us/FileList...c-ds3r_2.1.pdf

Although the board supports DDR3 1333, there is no 2GB RAM stick on
this list. It has two 2GB choices for DD3 1066: 2GB Kingston
KVR1066D3N7/2G or 2GB Kynix HYMT125U64ZNF8-G7. Either choice would
boost my systems' current 2 GB DDR2 800 to 4GB DD3 1066. And I found
2 sticks of 2GB Kingston KVR1066D3N7/2G is $40 at newegg.com. Would
this be a good upgrade for my system?