DDR2 667 vs DDR2 800

December 20, 2007 at 19:43:59
Specs: XP, 1 gig DDR2 667
Hello everyone,

I was wondering if any of you will help clear up something that is clear as mud to me.

I was thinking of upgrading my ram from 1 gig dual channel DDR2 667 (5400) to 2 gig of dual channel DDR2 800 (6400). I am led to believe that this will be compatible due to the fact that when I go shopping on newegg.com and click on DDR2 667 link that I see both 667 and 800 ram available for purchase on the page.

Before I purchase this ram, install it and smoke something (electronically that is), I wanted to get your opinion.

My motherboard manual says that it compatible with DDR2 667 ram but makes no mention of the DDR2 800 ram. I did notice in the specs that the 667 requires 1.9 volts and the 800 requires 2.2 volts.

Thanks in advance for your input,

See More: DDR2 667 vs DDR2 800

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December 20, 2007 at 21:01:34
Most likely, changing the RAM won't improve performance. What CPU do you have & at what FSB speed? And what's the make/model of your board? If your board doesn't support DDR2-800, it will run as DDR2-667.

If you're not overclocking, the only CPU that can make use of DDR2-800 at it's default speed (400MHz) is an AMD A64 X2 system. Even a Core 2 Duo at 1333MHz FSB only needs DDR2-667.

You need to clarify your system specs, but it sounds to me like upgrading the RAM would be a waste of money.

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December 20, 2007 at 21:14:39
Check the specifications on your motherboard for the ram voltage, some don't allow the use of the higher 2.2 voltage.
If your board can't make use of DDR2 800, you may as well get the 667.
It's not that you can't use 800, but it will probably run at 667, the problem may be that running at a higher voltage could make your computer unstable, even unusable possibly causing damage.
As you have not supplied make and model of the motherboard we can't tell.

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December 20, 2007 at 21:18:23
Thanks for the answer Jam.

I can't remember the exact make and model of the motherboard. I'm not sitting in front of my PC right now.

I was reading the manual earlier today.
It's an Asus motherboard with a core 2 duo processor.

Thanks for helping me see a little more clearly on the subject though. I was beginning to get confused with all the offerings out there and sure didn't want to tear anything up trying to upgrade the ram.


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Related Solutions

December 20, 2007 at 21:19:16
Just get the cheapest decent 1GB stick -- DDR2-667 or DDR2-800 .... doesn't matter & add that to your existing 1GB for 2GB total, the DDR2-800 will scale back to match the DDR2-667 speed once you have it installed.

On the other hand, for what you should expect to pay for a retail 1GB DDR2-667 stick, you might as well get a pair of 2GB from ClubIT. You barely missed out on their $19.99 AR (OCZ GOLD (2 x 1GB) DDR2 deal. Not to worry, it's now just $5 more if you are interested & don't mind the rebate process.


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December 20, 2007 at 21:43:07
The Core 2 Duo comes in either 800MHz, 1066MHz or 1333MHz FSB versions.

- if you have the 800MHz FSB version & you're NOT overclocking, all you need is DDR2-400 or DDR2-533/667/800 underclocked to DDR2-400 speed

- if you have the 1066MHz FSB version & you're NOT overclocking, all you need is DDR2-533 or DDR2-667/800 underclocked to DDR2-533 speed

- if you have the 1333MHz FSB version & you're NOT overclocking, all you need is DDR2-667 or DDR2-800 underclocked to DDR2-667 speed.

In other words, if you already have DDR2-667, you won't gain anything by replacing it with DDR2-800. And if you're gonna add RAM to increase your total memory amount, you can get DDR2-800 but it will downclock to DDR2-667 speed. Even so, your DDR2-667 *probably* needs to be underclocked anyway.

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