So I just built a new computer and installed Ubuntu 10.10 on it
here are the specs
Mobo: Asus M4a785T
CPU: AMD Phenom II X4 965 Black Edition
HDD with OS: WD Blue 640GB
Storage HDDs: 4xWD Green 2TB (2 of the HDDs are TrueCrypt)

When I copy data from one of the TrueCrypted HDDs, the computer will freeze (display gets screwy and unresponsive).
Time to screw up will vary. Sometimes its as soon as I copy and sometimes its 30mins into the copy of lots and/or large files.
I'm pretty sure its not the HDD because I've used these same HDDs on an older computer with no issues. I recently put the HDD giving me issues into an external case and hooked it up to my laptop running Ubuntu 10.10 and copied the same files that were giving me fits.

So I thought it might be the system and not the HDDs
So I ran prime95(or rather the linux equivalent)
It ran for over 12Hrs with no issues. so I think the system is fine.

What could be causing the constant crashing when copying files?

Thanks

Update
I just ran memtest
separately both sticks pass the test
but when I run memtest with both sticks in (dual channel config) memtest reboots after a few seconds of starting up.

Bad Memory controller on the MOBO?

Hi,

possibly some kind of incompatibility betweeen these to memory sticks?

What power supply do you have? Make/model/wattage?

What wattage power should be used on that system, because I have the same mobo with AMD PHENOM IIX4 955 BE and the only problem I experience is IE crashes alot. My PSU is 425watts. Only running a printer, 1Tb sata hdd, dvd drive and monitor.

I don't plan on running much more on this computer because it's for the wife, but need to know if I should switch PSU, it came with the case.

The sticks are both the same speeds and they do work as part of a triple channel set on an intel motherboard.
The PSU is an Antec EarthWatts 500W.
I ran the memtest last night without any of the HDDs plugged in.
Separately the sticks of ram work
Together they fail.

At my last job I build a lot of systems, AMD and Intel. We recognized that some memory sticks that are designed for use with Intel have compatibility-issues with AMD processors and vice versa. Only thing that helps (and we have tested a lot): Buy RAMs that are built for AMD, or buy RAMs that are universal.

Edit: If you don't have a big dedicated graphicscard (I assume you are using your onboard-device), your PSU should be fine for your system.

@EDDY1: The wattage of the PSU is not really relevant, you should look after the maximum power output of your different voltage rails. Assuming that you are using onboard-graphics your system should be fine. A crashing IE can be caused by: It is IE. If you have crashes only in IE I assume a software error.

Yup I am using an onboard video card

Here is the memory I am using
http://www.ocztechnology.com/product...e_dual_channel
Says its qualified for both AMD and Intel

DDR3-1600 is not officially supported by your processor. I would test the following things:
1. Set voltage, clock speed and timings manually in your BIOS, test with Memtest.
2. If that fails, set your memory clock to DDR3-1333 in your BIOS, test with Memtest.
3. Change your RAM against 2 other sticks, test with Memtest (to be sure it is not your memory controller).

Thanks
I have not tried 1 & 2 yet
Will do that tonight.

As for 3,
I took ram from a friend's i7 machine but the memory is faster than mine DDR3-1800
Individually, they work fine - pass memtest
when 2 of them are installed - they fail memtest

took my ram and installed on his machine
they run fine together...

Okay I dont know how to set the timings manually for #1
There are a lot more settings than the usual x-x-x-x number for timings....
So I skipped ahead to #2
changed it to DDR3-1333 and DDR3-1066
still no luck....

I asked for make and model of power supply and you didn't respond. 425 watts, even from a high quality supply, has to be considered very marginal for that mobo/processor combination.

But since I asked the question and you didn't answer it, I won't bother repeating it.

Maybe nothing, but just by chance...

Did you try to reverse the position of the two RAM sticks while running Memtest? Did you run Memtest86+, not Memtest86?

Did you look at you motherboard manual for the correct placement of the RAM sticks? Some boards want the RAM in slots 1 and 2, other boards want slots 1 and 3.

PSU: Antec EarthWatts 500W

First I ran memtest86 then realized it hasnt been updated in over a year
So I downloaded memtest86+ and used that for all other testing
I've ran them in all kinds of positions.
4 Slots 2 Sticks - I ran them in every combination/permutation

UPDATE:
Test 1)
So I set the speed manually to 1333Mhz and I over volted them.
Runs fine in memtest now but will crash when running mprime

Test 2)
I under clocked it to 1066MHz and over volted them
Runs fine in memtest and runs mprime without freezing.

Just wondering why I had to under clock them to work properly?

Thanks