no
You have not stated your motherboard model correctly. Some motherboards from mercury with the 845GL chipset support AGP, and some do not.
It may or may not support 512 MB DDR RAM. Coz in market only 512 DDR 400Mhz is available, while 845GL supports upto DDR266 MHz. Incase if you have 512DDR400 MHz RAM also, you can install it. It will not do any harm to the system, but it will work at speed of DDR266MHz.... Prakash
Any 4x or 8x AGP card.
a chipset is a set of chips on the motherboard that collectively control the memory, buses on the motherboard, and some peripherals. High-performances chipsets-the X58bchipset supports the Intel LGA1366scoket Mainstream desktop chipsets-The P45,P43,P35,G45 and G31 chipset supports Core 2 Quad and Core 2 Duo Intel processers. Value desktop-The 910GL,845E,845G chipset supports the Pentium 4,Celeron,and Celeron, and Celeron D processors in low-end systems. Older value desktops-the 845 and 845GL chipset support the Pentium 4 or Celeron processeor in a low-end system using the 478PGA socket