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Maximum Memory - CPU Related?

 
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IFlyJava
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PostPosted: Thu Nov 30, 2006 7:23 am    Post subject: Maximum Memory - CPU Related? Reply with quote

Dumb question (apparently, since I didn't find anyone else asking it
:)

I have an AMD 1800+ CPU on an older main board which has a maximum of 1
GB. I find a few less old SocketA MBs with capacity for 2 GB. If I
put it there, is it safe to assume that that processor can access the 2
GB?

I can't find any maximum addressable RAM information on AMD's web site,
nor on Google... The implication being that if the memory is there, it
will find it.

Related question: I see where the processor doc (at AMD) specifies a
maximum FSB of 266 mhz; do I therefore not get any value out of going
to 333 DDR (PC2700)? Should I just stick with PC2100? MUST I stick
with PC2100?

Any thoughts?

Thx!

Thomas.
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Paul
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PostPosted: Thu Nov 30, 2006 9:29 am    Post subject: Re: Maximum Memory - CPU Related? Reply with quote

IFlyJava wrote:
Quote:
Dumb question (apparently, since I didn't find anyone else asking it
:)

I have an AMD 1800+ CPU on an older main board which has a maximum of 1
GB. I find a few less old SocketA MBs with capacity for 2 GB. If I
put it there, is it safe to assume that that processor can access the 2
GB?

I can't find any maximum addressable RAM information on AMD's web site,
nor on Google... The implication being that if the memory is there, it
will find it.

Related question: I see where the processor doc (at AMD) specifies a
maximum FSB of 266 mhz; do I therefore not get any value out of going
to 333 DDR (PC2700)? Should I just stick with PC2100? MUST I stick
with PC2100?

Any thoughts?

Thx!

Thomas.


Here is an Athlon S462 motherboard that takes 4GB of memory.

http://www.asus.com.tw/products4.aspx?modelmenu=2&model=222&l1=3&l2=13&l3=60

If that much memory could be put in there, some would likely
be lost to address space needed for PCI or AGP etc. If you
installed 4GB of memory, expect to get to use 3.x GB of it.
Maybe 3.2 to 3.5GB or so. It is a similar problem to a P4
system, in that there is a 32 bit address space, but part of
it is needed for the I/O busses.

You can buy DDR400 RAM. DDR400 can operate at DDR333, DDR266 and
so on. There is no point in buying a slower rated RAM, *unless*
your motherboard is known to have a crappy BIOS, *and* has a
Northbridge with a known restriction on memory speed. (Nforce2 IGP
comes to mind.) If you buy DDR400 memory, you can use it in a more
advanced motherboard, like a S754 or S939 upgrade.

There is no need to go searching for some grotty PC2100. If
you get PC3200, it will keep its resale value better.

Paul
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