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RAM at boot different than RAM in Windows WHY?

Maybe this is a silly question, but this has always baffled me.  Why is it different on the boot than what device manager reports?  It's usually a 4 MB delta, video ram?

Why?  Is this OK or normal or should I fix something?

Thanks.
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knine
Asked:
knine
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1 Solution
 
Davy070599Commented:
Hi,

How much does the device manager report and how much do you get on boot?

Byeee...
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jgreshamCommented:
Sounds like you have an onboard video card that is using main memory (shared).

Some addin cards also use main memory  and do not have any memory of their own.
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Asta CuCommented:
Interesting, Knine, that's exactly what one of our systems reflects.  At boot, the actual boot count 131,568 (or so, will check again when I can get to that system), and when I check device manager, it shows 128MB RAM.  On another system, bootup shows 196,608 but device manager in windows only shows 192MB RAM.  Both systems have an ATI Expert@Play card with 4 MB Vram on the video card.

Listening further.
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rkcthCommented:
This is due to the fact that 1 Kilobyte is actually 1024 bytes and not 1,000 if you take 2 to the 17th power you get 131072. This is due to the fact computers run off of binary allowing only 2 values 1 or 0. Instead of ten. So place values are always a power of 2.
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knineAuthor Commented:
Although I appreciate the information and thank you very much.  Still don't know the basic information I seek:

1.  Is it normal to have RAM at memory check/post system load be different than the RAM that windows reports?  Say in my example or the other specific example shown by Astaec where it's 192 vs. 196MB.

2.  If this means as I guessed that it's video RAM, why doesn't Windows 98 figure this into the RAM total?

3.  If this means that I'm short 4 or so MB, should I enable something in my BIOS that isn't to allow video ram to be shadowed, or snooped or whatever?

Thanks.... looking for a specific answer as to why they aren't the same, if it's OK and if not, how to change.

Of course, any RISK in doing this would be nice to know.

INCREASING POINTS.

THANKS.
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Asta CuCommented:
Listening since I also can't find the answer to this.  In my case, also, we have a 4 MB chip on our Video Card and the difference is about that.  As regards reading about the recommendations in our ASUS MB manual, no mention whatsover about how to get settings such that RAM is equal in both spots.

Listening further.
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Davy070599Commented:
Hi,

Some maths here:

192 MegaBytes = 196608 Bytes

32 MegaBytes = 32768 Bytes

rkcth gave you the right answer.  It's because 1MB = 1024 Bytes.

There doing the same trick also with hdd's these days.  They sell you a 6.3 Gig and actually it's only a 6 Gig.

Don't worry about it, it's perfectly normal.

Byeee...

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Asta CuCommented:
Of course, here I go with my other favorite word .... DUH! Always more to learn.  I thank you.

Well, Knine, we both have our answers.

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rkcthCommented:
Thank you for the support davy. I didn't have time to write out all of the math.
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knineAuthor Commented:
Thank you.  Also thanks to Davy who expanded it a bit so that it made sense.  For his effort as well, will post a few points as well.  Please, Davy, post your answer there for points.

Again, thanks.
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Davy070599Commented:
Hi,

I don't do it for the points.  I only want to help people.

Byeee...
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