Motherboard not finding new ram

[Sulik2]

I am having a strange problem with some new ram. I have an AOPEN Ak86-L motherboard and have ran it with and an athlon 64 3000+ and 512mb of mushkin enhanced ddr 400. 3-3-3-8 timings. I have nothing overclocked in my system and it has ran fine for a year and a half now.

Recently, I bought 512mb more of the same memory. However, when I check my ram count in the bios and in windows its still only showing 512mb of ram. So I ran memtest86 to see what was going on. Memtest was only showing 512mb as well. I have tried moving the ram around in the dimms and still no go. But what is wierd is when I take out the original ram that has been running fine my computer recognizes the new ram and still shows 512mb of ram. So what is going on? Have I missed some sort of setting or jumper to enable more than 1 dimm at a time?

I also checked each stick individually with memtest. My old stick showed no errors and the new one found one bad address. Could that be what is messing it up and should I go ahead and rma it anyway for 1 bad address?

I am totally out of ideas for where to go from here, any suggestions?

 

[boomdawg]

It found one problem on how many passes? If it was like 10 passes and only 1 issue I don't know, 25 passes with 1 problem I'd say it's fine. If you only did 5 passes I'd say test again and let it run like 12 hours.

 

[Sulik2]

It was like 8 hours and found the same bad addressI think it was 90 times. I have experienced a few random crashes so I am pretty sure the ram is defective and I am RMAing it. However, my question as to why my motherboard wont recognize 1 gig of ram still stands. If it would find the defective one and the good one when only one was installed at a time, why wouldn't it register both sticks at the same time?

 

[birdpup]

Originally posted by: Sulik2
If it would find the defective one and the good one when only one was installed at a time, why wouldn't it register both sticks at the same time?

I suspect the reason is related to the defect and it is bigger than one bad address. It should work as expected with a properly working ram stick.