First thank you for your help
the problem is that the P4M800-M7 don't accept any RAM (memory ddr1)
except the first one installed one year ago which is a ram DDR 1 (333) if i change another with the same specification it doesn't work
and with this ram (the first) only dod is operating (via floopy) if i begin to install windows (millenium or XP)
it is blocked just in the beginig of installation
this is my email email@example.com
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No. Just make sure that you two RAM modules have the same specifications (speed, clock).
If you don't know about that, then simply insert both RAM modules and start your computer. If Windows loads, then right click on MyComputer and go to properties. If it shows 1.5GB then you are OK.
If the computer fails to start or you hear multiple beeps it means that they are incompatible.
Replace the 512 module and insert the new one and try again.
Always remember to turn off the power and unplug the cable from the power supply before replacing RAM modules.
DDR 2 will _not_ work the way it's supposed to in a DDR slot, if at all. If you want to see what memory your computer can use, go to crucial.com or similar website for a free scan of your computer. From the spec. sheet it looks like your machine takes a maximum of 2 sticks of 1 gig each (for a total of 2 gigs) DDR SDRAM, either 333 or 400MHz of memory
Yes, according to the specs that I read the P4M800-M7 (socket 775?) is designed to support pc333.
Only one time I had a problem with an ECS motherboard, I had the correct memory, but the board had a different voltage requirement. Did not cause any issues, other than it didn't work. I don't think that this would be a problem for you though.
first of all you should know that even though pentium 4 isn't that old there are still some problems, for example the d processor uses sd-ram or ddr1 ram which are much slower that ddr2 and ddr3 "ddr1 isn't that slow" but if u're using SD-ram then u might wanna upgrade your rams a bit.