Memory Upgrade?

There is something, on the newer motherboards, called Dual Channel.

Basically, it pairs up two RAM sticks to increase the memory throughput, to avoid bottlenecking.

Usually, the memory slots are color coded on the motherboard. Although that is probably not the problem, make sure you have like-sized sticks of RAM in the same color coded spots, also the same speed (pc5600 with pc5600)

Its not OS limitations, try checking to see how much memory your Video card has. A lot of times a video card has "shared" memory, which means it steals its RAM from the available ram on the system, instead of having its own RAM.

Hi, I have read documentation and they say that it's a chipset limitation.

I have same mobo with 3GHz Northwood HT 800 FSB. When I used 2x256 Kingston 2.2.2.5 in slot 1 and 4 it works fine with performance mode enabled in BIOS and XP reports 3.03GHz and Sisoft Sandra reports 5005 benchmark value.

I change the memories with 2x512 Kingston ultra-low 2.2.2.5 in same slot 1, 4 and I have blue screes only if I disabled performance mode. XP reports 3.01 GHz (I lose 15 Hz) but Sandra reports 4564. I lose aprox 3%. Too much.

Hope for good response. Have I nice day.

Dragos

3337mb of ram.Is it O.S. limitations?

Yes your running a 32 bit Vista Ultimate operating system.

You need the 64 bit version of Vista Ultimate.

The bottom line: don't buy more than 3.0GB of memory on a 32-bit system. You are only WASTING it.

you cannot have "mixed size" memory (1,1,.5,.5) to have 3 gigs of memory AND have it run in dual channel mode.

All sticks must be of the same size to be able to run in dual-channel mode.

Some OS only support 3GB of ram... what is your OS? Mac or Linux or Windows?

yes

go to crucial.com and let it scan your system and tell u!