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XFX 780i Missing 500MB of RAM in Windows XP

post #1 of 7
Thread Starter 
Ok, i need a little help with this one as its driving me nuts!!!!
Have had my XFX 780i for a few weeks now and it is running beautifully with my quad clocked at 3.2Ghz 24/7 and have had it up to 3.6 stable. It is all set up as stated in my sig below.
I just ran 3dmark06 and noticed for the first time that it says i only have 1.5gb of RAM when infact i have 2GB, have also just looked in the windows xp system properties and task manager and it says that i only have 1.5gb of RAM Total. But cpu-z and pcwizard08, the bios and post screen and most other progs say that i have the full 2GB.
Whats going on, does this mean that i only have 1.5gb available and that 500mb is being used for something else? Has anyone else with a 780i board noticed this?
How do i solve it? I cant afford another 2Gb and 64Bit vista to get 4GB working and reconised.
Thanks

Have added a screenie of windows xp system info and task manager showing 1.5gb and cpu-z which shows 2gb
Attachment 71417
LL
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post #2 of 7
Thread Starter 
Has anyone else noticed this problem on a 780i board? Is there an option to disable something to get the 500mb back.
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post #3 of 7
All at stock speeds for testing-no OC at all

Heres what i have found:
So i recently did an upgrade from an E6600 to the E8400
From 2 Gig of OCZ Platinum DDR6400 to 4 Gig OCZ Platinum PC8500
from 2 7900GTX in SLI to 2 8800GT in sli


Thought obviously it was do the upgrade
so i put my old components in
Right Back at 2Gig of Ram


Next i put the new 4 gig of ocz in with my 7900GTX's in. tried both e6600 and e8400 cpu
Up to 2.5 gig of Ram
That is correct for my system configuration in a 32 bit os
512x512 for graphics
512 for ram pci sound and cpu
So I KNOW all i will see out of 4 gig is 2.5. (This is where you resist to post an answer about the way 32 bit operating systems allocate ram! and im perfectly fine with 2.5 gig out of the 4.

The rub is, people with this problem are seeing 1.5 gig
That means for some reason my system is allocationg 2 gig of address space for my 2 8800 GT's in SLI. Sorry, Thats just plain wrong! Yes they are 512MB cards not 1G

Heres what ive tried:
and hopefully i will keep a whole lot of other people from wasting a ton of their time:
3 days of mine to be exact. none of these troubleshooting procedures helped at all


Clean load xp pro (not mce) 32 bit no service Packs
xp w/services pack 1
xp w/service pack 2
xp w/service pack 3
all tried with and without video or chipset drivers
same problem

old e6600 cpu and old ram+new 8800's
same problem

removed soundcard, DVDR all usb devies except keyboard and mouse
same problem

yes if i remove one card and just run 1 8800GT, im back up 2.5 gig

the mobo does see all 4 gigs of ram at post
disabled sli memory in bios
tried 1 stick of ram at a time
disabled sli in windows
lots of mobo tweaking
same problem

tried microsoft PAE switch for 32 bit os
disabled page file
disabled dep
changed memory usage from programs not system cache
nada

went thru P21 thru P32 bios for my evga 680i board
not that it matters because the P32 bios is the best pick for the E8400 cpu
same problem

i dual boot xp/vista 32 bit. same problem both os

The only thing that will let me see my 2.5 gig is dithcing these damn XFX 8800GT's

I have lots of friends that are gamers, one of theme is having the same problem with an almost identical machine. so we all got together and played part swap and tried these in my system:

2 msi 8800GT - guess what? 2.5 gig
2 bfg 8800GT - back to 1.5 gig ***?
2 xfx 9600GT - 2.5 gig
2 evga 9800GTX - 2.5 gig


tried all kinds of different ram from friends pc's
same problem

if i put MY cards in my freinds pc (780i mobo,E8400, PC8500) he's down to 1.5 gig of ram
puts his 9800's back in, back up to 2.5 gig

Hope that is enough detailed info. As you can see ive tried A LOT of things with no luck.

clean loads, hardware swaps, bios tweaks and all i get is the bird from my pc.

Heres what i think

1) the E8400 cpu ,PC8500 Ram, 680i or 780i mobos and 8800gt card just dont play well together. Lots of people with this problem have almost this identical setup. hardware might be from different vendors but the results are usually the same.
2) Its either the 680i bios, the 8800GT bios or a combi of the 2.
3) i guess it could be a windows problem also (but i doubt that)
4) lets face it, removing the 8800gt's fixes it. so i dont know what to tell ya.

there is no updated bios for the cards on xfx's site. i do hear they have one that stops the infamous fan running at 30% and a couple of pci-e vs 1 tweaks
im trying to get my hands on that. ive talked to both xfx and evga. but no answer yet.
im not holding my breath on that one. this isnt an epic problem, its a small one, so im pretty sure were gonna get shafted by the vendors.

Oh, and no posts about 64 bit OS. i have tried that too
In a 64 bit os i get 2.5 gig ram (xp and vista both)
i might game, but im in web developement as well. A LOT of my software does not run in the 64 bit os, so its just not an option. and no, i dont want to run a VM on top.

i use xp for gaming and my work
i use vista to run my DX10 Games
all my DX9 games i still play in xp. they just perform better there.
no, i dont want to run 64 bit windows for gaming and 32 bit for work

my gaming performance rocks, im happy with it. 15,300 score in 3dmark06. not to shabby.
unfortunately that extra 1 gig of ram hit really kills some of my developement software when im working.

so there you are geeks o' the world.
Wrap your brain around this problem!

if you post an answer about something ive already tried, you might get flogged!

thanx again!
post #4 of 7
sorry meant:
changed memory usage from programs TO system cache
nada
post #5 of 7
Same problem here on first build. 1 day troubleshooting till I read this thread.

results
xp pro sp2
xp system properties displays 2.5 gig
3Dmark06 13644
3Dmark06 memory diplays 2560 ram

xp pro x64
xp system properties displays 4 gig
3Dmark06 13699
3Dmark06 memory displays 4096 ram

Im good with the benchmarks.
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post #6 of 7
Believe it or not Some of the Video Cards that you add to your system DO take system Memory off the MotherBoard unless you change the Settings in the system. Be Careful on which Video Cards you buy. If the Card states a series of Ram Amounts on the box or in the instructions you can be guarenteed that that video card will eat system Ram
post #7 of 7
Check around your BIOS for a "Memory Remapping" option. If present, that will solve your problem of your video cards stealing RAM.


Looking further into your issue, it seems as if the 780i chipset does not support the memory remapping feature. Your only solution would be to move to a 64-bit OS. Remember that 32-bit Windows can only see 4GB of memory, inclusive of both system RAM and vRAM. Thus, your video cards' memory capacities will take away from your totals. Install 64-bit, and you will show all your system RAM and vRAM.
Edited by captthunderpnts - 10/20/09 at 2:25pm
    
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CPUMotherboardGraphicsRAM
Q9550 @ 3.8ghz Gigabyte X38-DQ6 XFX HD4850 G.Skill 2x2GB PQ 1000mhz 
Hard DriveOptical DriveOSMonitor
Seagate 500gb+WD 500gb+Hitach 1TB LiteOn DVD+RW SATA 20x Windows 7 Ultimate x64 Acer P244W 
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1st Gen G15 Corsair TX750W CM HAF 922 Logitech G500 
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