[Solved] Installed althon 64 x2 4800+ and only shows 2.50GB RAM

Ok so I have an A8N-SLI running bios version 1011 which acording to ausus supports the 4800+ dual core.
I have 4GB of ram installed and 2 nividia 7800GT OC (256mb ram each)

Now when I had the athlon 3800+ (single core) installed It showed 3GB ram in the system properties

I have searched on here and on google and I can't find anything relating memory and change of processor.
Is there anyway I can get this to show 3GB ram again In XP professional SP3 (32bit)or even 4?

What is your OS?

Thanks for the fast response I'm running XP Professional 32bit
All memory is frilmly seated and was not even brushed druing the processor change.
The system has been restarted multiple times and 4GB remaping options in bios have been enabled and did not change when the new CPU was detected.
I have not updated the bios because my current version is listed as supporting all my hardware and has not given me any issues in the past.
I agree the CPU change SHOULD have nothing to do with the change in memory display but being that thats the ONLY thing I changed (all other hardware and bios settings are the same as before) so thats all I have to go on for now. I'll try removing and re-installing and seeing what that does...

would you also happen to have bois ver 1014-002 ? I have read several threads saying that is the most stable bios for the a8n-sli but that the support site only gives ver 1014 (-000)
I'll try a bios reset I'd like to see what other alternatives there are before I go updating the bios because I like to reserve that as a last resort or if a component just insn't supported. (Or isn't fully supported, which may be the case)

4096 is 4GB, though sometimes it shows up a hair less (like 4090). I'm not sure what mine say during post.

Actually, I guess despite the similarities, they went a few BIOSes farther with the deluxe. I use the 1805 BIOS (2007/07/04) which worked great for me, but I guess that doesn't exist for your board.

Did you reinstall windows when going from the single core to dual core?

Also, after resetting CMOS, did you go back in and load defaults and then properly set other settings?

Go into device manager and see what the system/computer driver is and how many cores show up there.

You shouldn't have to reinstall Windows, and the processor is displaying as it should under the device manager.
Do you have 2 CPU graphs in your task manager? You should.
Now, back to the original problem, is there an option in your BIOS for memory remapping? You may need to turn it on if there is.

I don't know why I didn't notice this sooner but my memory had been clocking as 333 instead of 400 on the post screen. so I went into dram settings and moved it from auto to manual and set the correct frequency... once in windows it was clocking 367 so I went back to bios and set mem voltage from auto to 2.75v It is now clocking 420 in windows.
the post screen also shows "3932....ok" and sysem properties is telling me 2.75gb.
Could the problem be that the automatic values for voltage are not high enough for a system running the dual core? I'm going to set the cpu voltage to manual next and see if that picks up the last .25gb
...

I dicided to put bios 1014 on there. (could not find 1014.002) after putting that bios on it went back to showing 2.5 nomatter what I changed. on the other hand my onboard lan works better so I may just keep it.

I spent an afternoon swapping parts back and forth trying my memory out of other computers. It seems that anytime the x2 4800+ is installed it will default to 333 when more than 2 mem slots are taken. but if all 4 aren't used the cpu will not reach its full clock speed.
Maybe if I'd gotten an x2 4600+ instead (only differance is the cache 512 vs 1024) I wouldn't have had this problem? anyway it runs fine even if it only uses 62.5% of its memory and I've got the cpu clocked up to 2.59 right now.(yes I used standard settings when playing with the memory)

maybe I will mess arround with the beta BIOS(1604) and see if that gets me farther. there are no notes on the beta so who knows, maybe thats what they were trying to fix.

Normally those were harder to break, but a good idea to check.

Also, I'm not sure if the old 939 chips can do 4 x 400 MHz Ram (might need to be 333). Could your old chip do 4 x 400?

the old chip defauled to 4x 400 MHZ. I thought I was pretty anal about the pins each time I found one bent on first install and a used a credidt card to align it with the row. I can check again just to be sure. If u don't hear back that wasn't it.

I found some dual core drivers on the amd website, somehow they brought my temps down (prolly real time throttle and voltage control) but no help with the memory situation.

I don't see why that should help. I can't remember what my old boards showed. If only I had my socket 939 with my, but unfortunately that is back at home.

In reality though, I doubt that you will see a big loss in most applications by losing a little ram.

Well, glad you got is (somewhat) figured out.

No problem. Might have found the answer sooner except I never had more the 2GB of ram in my FX60/A8N computer (though I did have two 256MB cards).