Showing only 4 out of 6GB Ram

Greetings

I have been having this problem on and off for the last year and a half , they way i fix it usually as it happened 4 times is go open my computer remove the sticks and rearrange them until when i restart i see on my computer properties i have 6.

Usually this worked but last week when it happened i tried this method and it fixed ok. But when i restarted my computer it reverted to 4GB.

Now CPU-Z shows 6, memtest shows no problem, so i am thinking its the voltage and timing? Ah my motherboard is asus pt6se

Now i don't have a very good knowledge of BIOS and i am always afraid i am going to screw something up so bear with me

Can you tell me were ui have to go in BIOS to see my RAM, how to change manually the settings so i can fix this problem.

I appreciate all the help.

It's unlikely anyone here has your exact motherboard because there are just so many different motherboards and each motherboard has it's own BIOS (although there are similarities between many motherboard's BIOSs) and that makes it difficult to help in this situation.

If you have the motherboard's manual then there should be information about your BIOS.
There can be many reasons for the problem and changing RAM settings might not make it fixable. If you can find that manual here are some things you can try:

enable memory remapping

check to see if your memory voltage and other memory settings (frequency, latency timings, etc.) are correct for your memory kit. The rated settings for your kit should be in many places online including whatever site you bought them from, manufacturer's website, and possibly any reviews of the kit if you find any from Googleing your kit.

check to see if the pins of the memory modules and memory slots are dirty in any way.

Oh i forgot to mention on the ASUS PT6 SE memory remaping is on by default, no option exists in the bios.

His windows has to be 64 bit if the machine occasionally lists the available memory as 6GB.

I never said x32 windows wouldn't recognize the 6GB of memory or that you couldn't use it by work-around just that it wouldn't be listed as available for use in the computer properties.

Since the OP stated that his machine sometimes lists the full 6GB as available then it is a 64 bit OS or he has a workaround being used.

Have you tried troubleshooting to see if only specific memory modules and/or slots on the motherboard are causing problems?