Adding 800MHz RAM to 533MHz RAM

February 4, 2010 at 02:48:26
Specs: Windows XP, Intel 3.0Ghz Dual Core
Hi ppl,

My motherboard is MSI 915P Neo2 V2.0
(http://eu.msi.com/index.php?func=proddesc&maincat_no=1&cat2_no=&cat3_no=&prod_no=226#)

• Supports four unbuffered DIMM of 1.8 Volt DDR2 SDRAM
• Supports up to 4GB memory size.*
• Supports Dual channel DDR2 memory architecture.
• Supports DDR2 400/533 memory interface.

Im going to buy new DDR2 RAMs to my PC. Considering if there will no problem if i install :

4GB 800MHz DDR2 Non-ECC CL5 DIMM (Kit of 2), Standard 256M X 64 Non-ECC 800MHz 240-pin Unbuffered DIMM (SDRAM-DDR2, 1.8V, CL5)

OR safly :

4GB 667MHz DDR2 Non-ECC CL5 DIMM (Kit of 2), Standard 256M X 64 Non-ECC 667MHz 240-pin Unbuffered DIMM (SDRAM-DDR2, 1.8V, CL5)

Thanks for help.


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#1
February 4, 2010 at 04:50:37
Remove ( ) ,what is your cpu name? Your board support ddr2 400 & 533, i have some mobo support up to ddr2 533, when ram ddr2 800 installed the system won't post. But many of the i have seen works. Better see ram qvl(qualified vendor list) for your motherboard.

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#2
February 4, 2010 at 05:10:20
Here's the motherboard link without the ( )

http://eu.msi.com/index.php?func=pr...

You listed your CPU as "Intel 3.0Ghz Dual Core". Is that a Core 2 based Pentium dual core or a Pentium 4 based dual core? Each has different memory speed requirements. Without knowing which CPU you have, it's difficult to say which speed you should run the RAM at. There's no guarantee that DDR2-800 will work in your board...it *should*, but it may not. Since the board only supports DDR2 400/533, it will be underclocked to at least DDR2-533 speed (266MHz). But it's very possible that running it at DDR2-400 speed (200MHz) will give better performance.

List exactly which CPU you have.


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#3
February 4, 2010 at 06:58:36
Sorry for bad info.

CPU is :

P4 - 3.0GHZ BOX LGA 775 64bit.


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Related Solutions

#4
February 4, 2010 at 07:45:14
If it's a P4, it's not a dual core.

If it's a 533MHz FSB P4, the proper RAM speed for optimal performance would be DDR333 (166Mhz). But if it's an 800MHz FSB P4, the proper RAM speed would be DDR533 (266MHz).


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#5
February 4, 2010 at 08:27:43
yea, sorry for bad info

i took screenshot of CPU :

http://img171.imageshack.us/img171/...

So i cant add there 667 or 800 and use it underclocked?


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#6
February 4, 2010 at 11:37:26
edited...

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#7
February 4, 2010 at 14:04:15
"So i cant add there 667 or 800 and use it underclocked?"

According to Crucial you can use DDR2-667 (PC2-5300) or DDR2-800 (PC2-6400) but notice that they list "DDR2 SDRAM Frequencies: PC2-3200 and PC2-4200". I can only assume that means that the higher speeds RAMs will automatically underclcok since they are not officially supported by your old board.

http://www.crucial.com/store/listpa...


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#8
February 4, 2010 at 22:16:48
Jam, big thanks to you and others too.

Problem solved.


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