I bought a new additional 512MB DDR RAM yesterday.

After installing the RAM, I normally started up Fedore Core 2, Gnome, gkrellm, licq, terminal, mozilla and mldonkey.
The strange thing is that mldonkey (mlnet -daemon) was running, but I couldn't connect to it by telnet or www. But before installing the RAM (and a new soundcard too) it always worked.
I also had a zombie process (netstat, that I did NOT use), which I never had before.

Now I removed the RAM, and mldonkey works again. So I suspect something is wrong with the new RAM.
I wanted to test it with memtest86-3.1a, but this always segfaults no matter if I have the new RAM installed or not.
Does anybody know a working memory test program or what the reason for this strange computer behaviour could be?

use the memtest program at boot (use the .bin as bootimage) and test memory for a day or do a few find in your / or run some machine test like burn. if the kernel oops'es it's your mem.

do you have all your memory in bios and via "mem" avail?
is there a difference in the dmesg output when booting with/out the new ddr?

sl mritch.

thank for the help!

I will try with the boot CD when I'm at home.

I just looked at the info by top, there the new RAM showed up correctly. And everything else also worked (faster!) except mldonkey, which is strange. ...and I had a zombie for the first time, only some minutes after booting. it was netstat, which I did not start. this was strange too.

I tried the memory test and got errors, and mldonkey doesn't run with the new RAM. SO it's probably damaged.

Or maybe the two DDR RAMs are of incompatible frequencies. It this possible? One ist more than a year older than the other...
I have a gigabyte amd board.

as you get errors with the ddr i suggest to give it back and maybe try another. try switching to different memory timings in the bios and rerun the test.

yes, there can be a prob with ram modules from different ventors or the memory subsystem of your machine. google for your motherboard/ram to get info about compatibility probs.

sl mritch.