RAM for Pentium D Dual Core with Intel 945GCL

May 7, 2011 at 03:33:31
Specs: Windows XP, DualCore Intel Pentium D 820, 2800 MHz (14 x 200)

I want to upgrade PC from 512 MB RAM to higher value. Can you suggest the right RAM size and type to use.

Existing Configuration:
CPU: DualCore Intel Pentium D 820, 2800 MHz (14 x 200)
MotherBoard: Intel Coryville D945GCL, FSB 800MHz,
Existing RAM: 512 MB (2 ranks, 4 banks), Unbuffered DIMM, DDR2-533 (266 MHz) in one SLot
. Another slot is empty.

I have read articles in this forum as per which
DDR2 / 2 = Intel FSB / 4
Since i have a processor with FSB 800 MHz, DDR2 should be DDR2-400. Does this hold good even with Dual Core processor?

Does it matter which DDR2 Module type is used like Unbuffered, Single Sided Double Sided?

Can I have existing 512 MB with 533MHz in one slot along with 2 GB MB with XXXMHz in other slot?

Please suggest me the solution which would be the most appropriate for the existing system.


See More: RAM for Pentium D Dual Core with Intel 945GCL

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May 7, 2011 at 07:41:11
The Pentium 4 / Pentium D is a highly inefficient CPU. To help make up for the inefficiency, the RAM frequency should be run a step faster than the CPU frequency. Notice that I used the term "frequency". I'm not talking about the bogus FSB speed or DRR rating. The optimal FSB:DRAM ratio for your CPU is 3:4.

Since your Pentium D runs at 200MHz frequency (800MHz FSB), it should be paired up with RAM that runs at the next step in frequency which would be 266MHz. 200:266 = 3:4. That means you should be running DDR2-533. The system will obviously work if DDR2-400, DDR2-667, DDR2-800, etc is used, it just won't be optimal.

"MotherBoard: Intel Coryville D945GCL"

At least you have a crappy board to go with your crappy CPU - lol. Do you have a Gateway or an eMachines?


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May 7, 2011 at 08:36:59
Thanks Mickliq,

I assembled this PC myself, and did not know at the time of purchase about P4 and Pentium D being inefficient processors.

Out of curiosity, would like to know why P4 and Pentium D are inefficient? and how to get the information on good processors and motherboard.

Motherboard has two DIMM slots ..Is it fine to have 512MB in one slot and 2 GB in other slot?

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May 7, 2011 at 09:43:20
Remember that time changes everything. The Pentium 4 and Pentium D are inefficient by modern standards. But at one time they were state of the art and highly recommended. Take the most modern and highly recommended CPU available today, wait 5 years and you will find that it too are called inefficient.

Mixing RAM sizes or specifications is always a gamble. In theory it should work but that isn't always the case. Also remember that motherboards have a maximum capacity per memory slot as well as a maximum capacity. Older motherboards will often have a limit below 4 GB.

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Related Solutions

May 7, 2011 at 10:21:54
"The Pentium 4 and Pentium D are inefficient by modern standards"

While that statement is technically correct, the P4 was never a good design in the 1st place. The netburst architecture it was based on never worked as expected, but Intel had already commited to it so they had no choice but to push it. The cheaper & more efficient Athlon64 soundly trounced the P4's back in those days.

Intel basically abandoned the failed netburst architecture & developed the new Core architecture for the Core 2 Duo, then improved upon it for the Core-i series. Core architecture is loosely based on the same architetcure used in the Pentium Pro, Pentium 2, & Pentium 3.

Basically what you've assembled is a brand new 6 yr old computer.

Here's a good read from 2005:

Kudos and Calamities: The Death of NetBurst

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