I have this old machine on which I run W98. I have 4 Gb of disk space but only 20 Mb of working ram ie. 2 slots 8 Mb Sims plus 4 Mb of processor ram. The pocessor is an upgrade from Hypertec called HyperRace586 ie. AMD 5X86 running at 133MHz. Computer's System Rom is 486 C1 08/25/93 Question: Can I place 2 16 Mb sims in the 2 slots available on the board to give me 36 Mb of working ram? Thans for helping

It deppends on if your bios will support 16mb simms. Make sure they are non-parity (assuming that is what you got)and insert them into the slot. Be sure to keep your self grounded. If it works and your system supports it it should boot fine. If it does not it will beep and there will be no display. That is normaly so dont let the beeping scare you.

425 Memory ----------- System memory of the Compaq Presario 400 Series Personal Computers is based on a 32-bit data path and consists of the following elements: o 4 MB of 70-ns enhanced page memory standard o Memory is expandable to 20 MB o 1, 2, 4, 8 MB industry standard SIMMs may be used Memory Devices The Compaq Presario 400 Series Personal Computers come equipped with four MB 70-ns enhanced page mode Dynamic Random Access Memory (DRAM) standard. This memory is soldered to the system board in the form of eight 1-MB x 4 devices. The computer is equipped with four 72-pin SIMM sockets for memory expansion. NOTE: The first socket must contain a Compaq approved 4-MB SIMM. The remaining three sockets will take a 16-MB SIMM each.