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Samsung & OCZ memory don't work together? :(

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I've got an Alienware machine. Intel D875PBZ motherboard, Pentium 4 3.00GHz with HT, 256MB ATI Radeon X800XL AGP 8X, Creative Sound Blaster Audigy 2 and am running Windows XP Home Edition SP2.
I've got 4 memory sticks, 2 Dual Channel pairs. One pair is a Samsung-was installed in the computer when purchased and the other is one I purchased separately; OCZ Gold Edition pair. I've been running memtest to check the memory for errors.
If I install only the Samsung modules - no errors
If I install only the OCZ modules - no errors
If I install all 4 sticks - a lot of errors
If I install 3 sticks;2xSamsung 1xOCZ - a lot of errors
If I install 3 sticks;2xOCZ 1xSamsung stick A - no errors
If I install 3 sticks;2xOCZ 1xSamsung stick B - a lot of errors

Samsung - M3 68L6423ETM-CCC

I use the computer for everything, work, gaming, heavy internet use, music, movies..name it and I use my computer for it. Now with the four sticks I have how can I get the most out of my computer? Should I use just 2 to run in dual channel or 3 but in single channel? Also the Samsung works fine upto 2.5-3-3-6 and will go no lower even when combined with the OCZ modules. The OCZ works fine at that speed too but is capable of running at 2-2-2-5, haven't tested it out yet though.
These are the memory BIOS settings:
CPC Override - Disabled
SDRAM Frequence - 400MHz
SDRAM tCL - 2.5
SDRAM tRASmin - 6
Memory Refresh Cycle Time - 12 Clocks
Memory R/W delay - 2 Clocks
Memory R/W timing - 6 clocks
DDR Voltage - 2.775V (this is maximum)

Thanks for any help.
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You will probably want to run in dual channel mode. There is never any guarantee that mis-matched RAM will play nicely together. Your best bet would be to match all 4 sticks.
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Yeah I think one of the Samsung modules is faulty, have contacted Samsung and hopefully they will replace it. If not, I guess it'll just be thrown away. But now between 1.5GB at 2.5-3-3-6 in single channel mode & 1GB at 2-2-2-5 in dual channel mode, what do you reckon i go for?
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