RAM related blue screen error HELP!

[phreekill]

Hey guys, ive lurked around here heasps but i need some help.
built a rig about 2 weeks ago and it has been running fine
basically:
Q6600
P31-S3L mobo
had 2X1G OCZ 800MHZ RAM
8800GTS.

i bought another 2 sticks of the EXACT SAME RAM, 1 gig each and put them in today but its been giving me grief.
I'm kinda n00b with RAM but my PC runs fine until i play games (bioshock CS:S ect) an i get the blue screen of death and it reboots. also, in system, it recognizes 2GB of RAM, rather than 4GB and the same is in the bios.
Please dont flame, i read the FAQ an there seemed to be little there to help, any trouble shooting i should do.
cheers, lachlan

 

[phreekill]

http://img391.imageshack.us/img391/6725/ramtroubles2qm9.jpg
screens for cpu-z and sys info

 

[mike99]

If it is not seeing 4Gb in BIOS, you have a problem! Try the new sticks on their own. Mark your original RAM and try various combinatins until you DO see 4Gb in BIOS. Download a copy of Memtest86 and run it overnight when you do see 4Gb. If you are running 32Bit OS you will only be able to use 3Gb. Why do you think you need more than 2Gb? What are you running? What PSU, Make/Model?

Mike.

 

[zenmaster]

How many sticks of RAM are installed in the computer?
Your pictures show slots 2,3,3(again) and 4.

I am assuming you showed #3 twice by accident and have a stick in slot #1 as well.

 

[LoneEagle]

Also, look for Remap Memory Feature. This must be enabled so the 4GB of RAM can be accessible to XP 64 or Vista 64.

 

[mike99]

CPU-Z is showing 4Gb! You only have 32Bit Windows, so are limited to 3+a bit Gb of RAM. Try taking one stick out as Windows is only seeing 2Gb. Have you set memory volts to 1.8V? Try testing the memory with Memtest86.

Mike.

 

[phreekill]

thanks heaps for the tips guys, im pretty sure its to do with the 32bit operating system. i figure ill upgrade to VISTA 32bit which can handle 4gb, amirite?

also, I've taken two sticks out but im concerned as to why it says max bandwidth 400MHZ which its matched 800MHZ RAM on CPU-Z. see screenshot above as with two sticks in it has the same data displayed. i have them in slots 1 and 3 so it should be running in dual channel yeah?
cheers

 

[BustedSony]

thanks heaps for the tips guys, im pretty sure its to do with the 32bit operating system. i figure ill upgrade to VISTA 32bit which can handle 4gb, amirite?

also, I've taken two sticks out but im concerned as to why it says max bandwidth 400MHZ which its matched 800MHZ RAM on CPU-Z. see screenshot above as with two sticks in it has the same data displayed. i have them in slots 1 and 3 so it should be running in dual channel yeah?
cheers

Wrong on both counts.

A 32 bit operating system can only directly address 4 gigs, and some of that is taken up by video and I/O, that's why you only see between 3.1 and 3.6 gigs in EITHER XP or Vista 32. To use the full 4 Gigs you need Vista 64. The reason that some 32-bit O/S's such as Linux and MS Server 2003 can use all 4 gigs or more is that memory is paged through an upper address range, (written then read block by block) but this slows down memory access a LOT!

400 Mhz is NOT bandwidth, it's Bus clock speed. On DDR2 the memory access speed is clock X 2, or 800. Dual-channel memory is interleaved, a page can be read and another simultaneously refreshed, unlike single-channel which can only do either-or, thus Dual-channel memory doubles the USE of the memory per clock cycle, that is, it doubles the bandwidth.

 

[o1die]

I had to flash the bios to get rid of blue screens. But sometimes it doesn't work. I used an older version on my old dual sata II.