win 7 only sees 3.98gb usable memory

[ChristTheGreat]

I am not totally familiar with AMD setups, but, don't they have the mem controller on the cpu?

Try reseating your cpu and checking the socket and pins.
And, make sure everything is mounted correctly.

and memory remapping exist on these CPU, like my P8P67 Evo has this option if I remember well maybe this board doesn'T have it, I'll check manual...

 

[95Viper]

and memory remapping exist on these CPU, like my P8P67 Evo has this option if I remember well

That is all well and nice, but I was not speaking of mem remapping.

I was trying to point out that the cpu may not seated properly or some pins may not connected well... and the op may need to check it.
Possibly, an over tightened cooler or something.

 

[ChristTheGreat]

bios reporting has no information about memory,I changed the memory stick and booted with the old win 7 and still read the same

http://download.gigabyte.us/FileList/Manual/mb_manual_ga-990fxa-ud3_e.pdf

Standard CMOS Features

Extended memory: you should have the amount..

if 8gb, then reinstall windows might be a solution..

 

[95Viper]

if 8gb, then reinstall windows mi...same[/QUOTE] I think gusther has tried it.

 

[gusther]

there are multipliers about the cpu and HT etc. but I think it started when I tried to change the automatic optimizer of the memory that supposed to optimise the oc mhz (1600) with the rest of the bios setup, then it failed to overclock and restarted with that problem.

 

[95Viper]

Well, setting the bios back to default in the bios setup, should fix any of the messed up settings.

Did you try reseating the CPU in the socket and checking the socket and pins?
And, make sure the cooler is properly mounted.

 

[gusther]

I returned to install memory into slots 3 and 4 and now reread 8GB with 5.25 usable. Do not know why can not read properly in slots 1 and 2

 

[Hood]

If you tried all the above and no change then you have a bad stick -spend the $40 for a new kit, and give the old sticks to someone you don't really like - just kidding, RMA the old ones and keep a spare set. It only costs 4 or 5 bucks to mail them in (I just did a set of Corsair sticks).