Type and speed of RAM

Asus P4p800-e deluxe motherboard
September 22, 2010 at 12:03:45
Specs: Windows XP, Pentium 4 / 512 Mb
I picked up a replacement motherboard and wonder what is the maximum RAM I can use.
My o/s is Windows XP Pro SP3.. the Motherboard is an ASUS P4P800-E Pentium 4
- 3.06 GHz... In the BIOS it shows.:1600 MHz Speed FSB Speed 533 MHZ
I now have two slot filled with 256 Mb each = 512 Mb (total)
There are 4 slots in all.... the book states that this board qualifies for DDR400 modules..
and lists sizes 256 MB and 512 MB (no memtion of 1 Gig in the list)
BUT< On a previous page of the manual, it states that I can install from 64 Mb, 128 Mb, 256 Mb, 512 Mb AND 1 GB DDR DIMMs
Recommended memory configuration DDR400/DDR333/DDR266 and Frequency/CPU FSB 800 MHz, 533 MHz and 400 MHz and Memory Frequency between 266 MHz, 333 MHz,
400 MHz.

In the BIOS it reads: 512 Secondary memory cache
1600 MHz Speed
FSB Speed 533 MHz

My question is: What defines the type and amount of RAM I can use? the type of motherboard ??? or the CPU ????

Can I put 1 Gig DDR DIMMs in each slot to pump it up to 4 Gigs total or am I limited to the 512 Mb for each slot? I don't want to order 1 Gig modules if it won't take it.

Thanks for any advice... Jeannette :)

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September 22, 2010 at 13:08:11
the board support up to 4gb of ram (4x1gb non-ecc).
The correct ram speed for 533 fsb cpu is ddr 333mhz.

edit: "what defines the type and amount of ram i can use?" in your case the answer is motherboard why? Bcause mem controler is in motherboard (north bridge). U have to meet mem controller requirements.

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September 22, 2010 at 13:20:53
I hope you didn't pay much for that old board. Here's the specs, notice that it states 4GB RAM:


To back that up, here's what Crucial says:


Unless you're running a 64-bit OS, only 3GB - 3.5GB out of the 4GB will be recognized. And notice your CPU speed. It's running at 1.6GHz instead of 3.06GHz, probably because SpeedStep is enabled. The proper RAM to run with a 533MHz FSB P4 is DDR333, but if DDR400 is cheaper, go ahead & use it.

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September 22, 2010 at 14:46:28
Thanks so much for the info. I really appreciate the time you both took to help. :o) I printed your replies for future reference...
Best to you both,,, Jeannette

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