512 ram shows 502

i have d915 gav board with kingston 512 mb 400 bus ram but when i

right click on my computer it shows 502mb ram and when i open

direct x it shows 504 ram what should i do

 

try changing the slots they are in, making sure they are seated correctly

 

I've never had a computer acknowledge how much RAM I have had installed. When I had 1024 installed, Windows only recognized 992. This machine which has 512, Windows acknwoledges 507.

 

(windows) 1gig=1024mb. (actual) 1gig=1000mb You lose stuff in conversion

 

If you're using the on-board video, some of the system RAM is allocated for the video RAM, so that could be the reason.

 

is it cheapo ram/generic?

is whatever version of windows uptodate? possible causes.

 

and you lose 1-2 meg to shadow the BIOS.
Had an Trigem Imperial board that had on-board vid, at first boot I had 508 meg (2 meg shadow, 2 meg vid) when running graphic intensive ops, mem went down to 446 (64 meg to vid). Went and got a 128meg pci vid card to remedy that.