if you have installed two 512 MB of ram, then it could be due to ram slot. may be your one ram slot is faulty.
Maximum 2gb can be installed. that is 1gb x 2 ModulesSupported ram is DDR2 pc2-4200 Ram
Yes, In normal PCs, There are two modules for adding RAM, one is generally pre-occupied and one is left free to manually add RAM, If you add 1GB RAM with 256MB RAM, it will sum up to 1.25GB of RAM.
When you install programs they go on your hardrive not your RAM. So the answer is no.
RAM memory chips should be installed in single chips or matched pairs. You can not put in a 1GB together with a 2GB chip. You can not put in the wrong chip speed, ie a 667MHz chip. The newest iMac can support one or two 1GB or 2GB 800MHz DDR2 SDRAM SO-DIMMs. The lowest RAM is 1GB. It will also accept 2gigs via 1 2GB chip or 2 1GB chips. The max RAM is 4GB via two 2GB chips. RAM is installed in 1, 1+1, 2, or 2+2, sets.
1gb ram
The one with 1GB of RAM. 512MB is 0.5 of 1GB
The price of the Apacer 1GB DDR2 RAM varies depending on the location and model one purchases. One can purchase the Apacer 1GB DDR2 RAM on eBay for only $12.99.
2gb (1gb+1gb)
buy single 1GB ram and put it in single slot ... it works fine... I'm using 1gb ddr1 ram PC 333 on Intel 845 motherboard... its wrking fine...
that depends on wether the ram is DDR1, DDR2 OR DDR3 RAM
memory 1GB RAM
i think the speed of the computer will increase