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DDR2 800 or DDR2 1066

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December 14, 2009 1:44:36 PM




I have a ASUS P5KPL AM/PS,
asus says it supports ddr2 1066,Does it mean that my mobo can carry ddr2 1066 sticks?

OR

800MHz DDR2 can be oc to 1066?
What will happen if i put ddr2 1066 sticks in my mobo?

Thanks in advance!

More about : ddr2 800 ddr2 1066

a c 163 } Memory
a b Ĉ ASUS
a c 288 K Overclocking
December 14, 2009 11:56:06 PM

This is your mobo:

http://asus.com/product.aspx?P_ID=y014Wy067iZxxPeP

and yes, support 1066. So, you can OC your 800MHz memory till 1066, or buy 1066MHz memory. BUT if you buy the 1066MHz memory, you need set all the specifications of this, manually in the BIOS, i mean, the voltage, CL....
December 15, 2009 9:23:27 AM

That is ,If i oc my ram speed to 1066,I can use 1066 Sticks?
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a c 163 } Memory
a b Ĉ ASUS
a c 288 K Overclocking
December 15, 2009 1:51:46 PM

Yes, you can use the 1066 sticks with the OC 1066 ram.
December 15, 2009 2:09:55 PM

THANK U FOR THE REPLY!
a c 163 } Memory
a b Ĉ ASUS
a c 288 K Overclocking
December 15, 2009 2:32:41 PM

Any time, that's what we're here for.
a b } Memory
a b Ĉ ASUS
a b K Overclocking
February 1, 2010 2:48:03 AM

can you actully get ddr2 800 mhz ram up to 1066 stable or will most ram chips simply quit after a couple extra mhz
a b } Memory
a b Ĉ ASUS
a c 197 K Overclocking
February 3, 2010 3:44:56 PM

First of all, there ain't no such thing as DDR2-1066 RAM. Got your attention now, yes? :)  DDR2-1066 RAM is simply DDR2-800 RAM that has been tested to run at the higher speed, usually at an increased voltage and more relaxed timings.

Any good DDR2-800 RAM will run at 1066 speeds under those conditions.
February 3, 2010 5:42:35 PM

While this is mostly true (1066 being predominately PC2-6400 OC'd) there do exist PC2-8500 chips such as MT47H128M8CF-187E, just don't expect to find them on your everyday local DIMMs.

What about CT2KIT12864AA1067 ? true PC2-8500 or not, I can not see what chips are used to say one way or the other.
a b } Memory
a b Ĉ ASUS
a b K Overclocking
February 3, 2010 6:21:45 PM

Beetlebox said:
While this is mostly true (1066 being predominately PC2-6400 OC'd) there do exist PC2-8500 chips such as MT47H128M8CF-187E, just don't expect to find them on your everyday local DIMMs.

What about CT2KIT12864AA1067 ? true PC2-8500 or not, I can not see what chips are used to say one way or the other.


Yes it is true 8500, just make sure whatever you buy is on the QVL list....
a b } Memory
a b Ĉ ASUS
a b K Overclocking
February 3, 2010 6:25:10 PM

I would suggest you get a set of 2x 2Gb since your board only has 2 slots. If you decide to use 2x 1Gb modules you will endup paying more in the future since you will end up buying/upgrading the 2Gb anyways. And the fact that you will have 2 extra sticks laying around....personal experience =)

Here is the QVL :

http://i683.photobucket.com/albums/vv199/OvrClkr/newerq...



a b } Memory
a b Ĉ ASUS
a c 197 K Overclocking
February 4, 2010 2:25:01 AM

It's been a couple of years since I have visited the JEDEC (JEDEC Solid State Technology Association, formerly known as the Joint Electron Devices Engineering Council) website. The last time I looked, they said they weren't going to do a 1066 standard. Should have went back sooner. :( 

There is a recently published JEDEC standard for DDR2-1066 specialty (their words) RAM. After wading through nearly 100 pages of a pretty technical document, I believe that the simplest way to tell if a particular RAM is JEDEC compliant is to check the vcc. If the vcc is 1.8 volts +/- 0.1 volts at 1066 frequencies, it may be real 1066 RAM.

I checked the specs on the MT47H128M8CF-187E RAM. It runs at CL7 latency. Considering that CL4 DDR2-800 RAM is commonly available, and most of it will run at CL5 at 1066 speeds, I am not sure that the CL7 latency is really worth it.

But you are right. True DDR2-1066 RAM does exist.
!