My computer had no problems but... after a few years of 512mb of ram I needed more with so many new programs installed & running. Also I keep numerous applications open at the same time. Anyway I installed another 512 mb of ram and checked the bios on startup and both are recognized.

Also, before installation, I checked the available physical memory was down to about 100mb with just the normal startup but no other applications open. The available physical memory went from about 100mb before installation to about 600mb after installation.

I have read so much that everything must be the same this and the same that or both do not work. What I installed is NOT the same brand but otherwise everything is the same...512mb, PC 2700, 400mhz, DDR SDRAM.

The question......does it seem that the memory is OK? Is there any type of test to run?

Finally my computer specs said to use 1.6 volt memory (can't remember exactly maybe it was 1.8) but I noticed the new ram was 2.4 or 2.6 volt. Should that cause any issues?

Thanks for your time.

the voltage difference shouldnt be a problem, the fact that it booted and was recognized obviously is a good sign. unless you suspect memory problems, there is really no need to test it. with memory i would stick with the well known like kingston,PNY, OCZ,corsair,crucial. most of these have memory config.tools on there web site to help you pick the right type based on computer, part number etc. one will even scan your pc to see what you have installed cant remember which. the only tools i know of are memtest86 and i think ms puts out a memory tester also but they are for troubleshooting problems. there may be some apps that will benchmark your memory.

I just happen to have a list.

These popular RAM makers have auto-scanning and/or manual entry RAM wizards to help you determine compatible RAM. For manual entry, enter/select the PC or motherboard make and model number and the wizard will list compatible RAM.

Crucial - Memory Advisor
Corsair - Memory Configurator (manual data entry only)
GeIL - Memory Configurator (manual data entry only)
Kingston - Memory Search (manual data entry only)
Mushkin - Advisor
OCZ - Memory Configurator (manual data entry only)
Patriot - Memory Search (manual data entry only)
PNY - Memory Configurator (manual data entry only)
SuperTalent - Memory Finder (manual data entry only)

The following retailers have auto-scanners and manual wizards. They sell brand name and/or "house" brand (re-branded) RAM.

Newegg - Memory Configurator System Tool
MemoryStock - Upgrade Configurator
18004Memory? - Configurator

CPUz and Everest are great benchmarking programs that will tell you about your RAM, and more.

Finally, you can test your RAM using one of these programs. Both require you to create and boot to a bootable floppy or CD to run the diagnostics. Using the floppy method is generally easier and yet another reason I still include floppy drives in all my new PC builds. However, the CD method is just as effective at detecting RAM problems. Allow the diagnostics to run for several passes or even overnight. You should have no reported errors.

Windows Memory Diagnostic - see the easy to follow instructions under Quick Start Information.

MemTest86+ - an excellent how-to guide is available here.