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[Nation5]

I currently run 2x512 DDR2 800 @ 800mhz dual channel.
I'd like to buy 4x1gb DDR2 800.  Will this slow down to 667 since I will have to populate all 4 dimms? 
I have an AMD64 3500+ for a memory controller.

[Ex Forum User 3]

Yes you have to set them at 667 with 4 sticks.
Else the system probably gets terribly unstable.

[Nation5]

Thank you for the reply!
Could you answer me this one more question?
My manual says that there is a 4GB max that it will recognize.  While trying to figure this out for myself, I ran across a ram requirements site that listed my motherboard as having 4 dimms (correct), 4GB max (correct), and that it would only recognize 1GB max per dimm slot (??).
It doesn't say that in my manual.  Do you know if that is correct?
If not, in your opinion would it be better to do 2x2GB @ 800 or 4x1GB @ 667?  Reason being is that I've heard that servers utilize every slot they can since they have great memory controllers and actually can utilize all dimm slots at once, so the bandwidth is greater, albeit at slower speeds.  Does this same strategy apply to my setup with the AMD64 3500+ onboard memory controller?  Thanks again for the reply!

[Fredrik]

Can you point us to the site that says there is a 1GB limit / slot, please. The info might be dated. Could also be the wrong input. 
Corsair says, for K9N Neo-F V3 "4 DIMMs w/ DDR2 800+ up to 8GB ".
The MSI K9AG Neo-F has the limits you describe.

[Nation5]

Can you point us to the site that says there is a 1GB limit / slot, please. The info might be dated. Could also be the wrong input. 
Corsair says, for K9N Neo-F V3 "4 DIMMs w/ DDR2 800+ up to 8GB ".
The MSI K9AG Neo-F has the limits you describe.

My motherboard is the MS-7260, K9N Neo-F Version 1, if that makes a difference.  Could have different hardware components.

The site I found that info for was:

http://www.crucial.com/store/listparts.aspx?model=MS-7260+(K9N+Neo)
 
From the webpage: "Each memory slot can hold DDR2 PC2-8500,DDR2 PC2-6400,DDR2 PC2-5300 with a maximum of 1GB per slot.*
*Not to exceed manufacturer supported memory."

Now, my motherboard manual shows that PC2-6400 is the fastest ram supported, and the Crucial site shows 8500.

I had read that the memory controller on my CPU should be able to handle 4x1GB @ 800MHz, is this true?

Thanks again for all the help it is greatly appreciated!

[Ex Forum User 3]

It depends on de CPU, as the memory-controller is inside the CPU.

Phenom -> 2x DDR1066 or 4x DDR800
Athlon / Sempron -> 2x DDR800 or 4x DDR667

Has nothing to do with the board.

[Fredrik]

Crucial says:
"Q: How much memory can my computer handle?
A: 8192MB. Adding the maximum amount of memory will improve performance and help extend the useful life of your system as you run increasingly demanding software applications in the future."

"Each memory slot can hold DDR2 PC2-6400,DDR2 PC2-8500,DDR2 PC2-5300 with a maximum of 2GB per slot."
Don't know if anything will come out of this link:
http://www.crucial.com/store/listparts.aspx?model=K9N%20Neo-F&pl=MSI%20%28Micro%20Star%29&cat=RAM

They even suggest 4 x 2 GB memory

[gvguy39]

yes, you can have 4x1 GB ddrII 800 and even 4x2 GB ddrII 800 in your motherboard.  but depending on the cpu, you may have to tweak the bios to get it running at 800mhz, depending on the front side bus, multiplier, and the memory to cpu ratio.  For example... the cpu in my sig is windsor 5600 2.8 ghz with fsb of 200 and mult 14... memory ration is cpu/7  200x14=2800 2800/7=400mhz @ ddrII tada 800mhz (pc2-6400)

[Nation5]

Is there a difference between the K9N Neo and K9N Neo-F?  I don't see that my manual says Neo-F.  The title page says,

K9N Neo Series
MS-7260 (V1.X) Mainboard

Either way, I installed 4 sticks of Corsair XMS2-DHX PC2-6400.  I set the timings to 4-4-4-12 2T, and they are running at 800mhz.  Although my bios, and memtest only show 3328mb.  CPU-z see's all 4 sticks (4096mb).  XP shows 3.25GB.
I know that 32-bit OS's are limited to under 4gb of ram, but I thought that for sure my BIOS would see all 4096mb.  Any thoughts?  Thanks again for all the help!

[gvguy39]

Neo-f is the msi board #7369 (vsn 2 and vsn 3)

[Nation5]

Well that probably makes quite a bit of difference.  Thank you for clearing that up for me.  I apologize to everyone for my misinformation, it was still very helpful.

[mudbug]

Even though this is an old thread, the following may be useful:

I recently installed 2 2GB Crucial DDR2 PC6400 800MHz sticks on my K9N Neo v1 board (MS 7260).  Works fine, and BIOS reports a usable 3.2GB, as expected.  Adding a third DIMM has no effect - BIOS does not recognize it, though the system works - the board is limited to 4GB.

[Ex Forum User 3]

AMD's do not work well with 3 sticks, always use 1, 2 of 4 sticks.

And topic locked as it very old.