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Question about recognizing RAM in machine

I've got a newish cheapie Walmart computer running Linux, and it's acting squirrelly in a way that makes me thing there's something up with the Memory in the box.

So I swapped it.

But I noticed that every time memory is placed in the machine (using 2 256 chips and a 128 chip) it consistently reports 17M less than the machine should have. Like this:
A
Apr 16 12:13:51 webserver kernel: 0MB HIGHMEM available.
Apr 16 12:13:51 webserver kernel: 239MB LOWMEM available.
Apr 16 12:13:51 webserver kernel: Memory: 237288k/245696k available (1160k kernel code, 6104k reserved, 983k data, 120k init, 0k highmem)
Dec 31 20:01:47 webserver kernel: 0MB HIGHMEM available.
Dec 31 20:01:47 webserver kernel: 239MB LOWMEM available.
Dec 31 20:01:47 webserver kernel: Memory: 237288k/245696k available (1160k kernel code, 6104k reserved, 983k data, 120k init, 0k highmem)
Dec 31 20:08:57 webserver kernel: 0MB HIGHMEM available.
Dec 31 20:08:57 webserver kernel: 495MB LOWMEM available.
Dec 31 20:08:57 webserver kernel: Memory: 495572k/507840k available (1160k kernel code, 9704k reserved, 983k data, 120k init, 0k highmem)
Anyone have any idea why I'm seeing 111MB instead of 128MB, or 495MB instead of 512MB?

This is a derivative of Redhat 7.x, by the way.

Thanks.
 
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