Re: Mixing OCZ pc6400 with Corsair pc6400 on an Asus P5WD2 Premium

On Wed, 17 Aug 2005 14:59:41 -0400, nospam@xxxxxxxxxx (Paul) wrote:

>In article <4he6g1ds4h7pq9u2nptjb7lqq4ase9lojf@xxxxxxx>, Richard E.
>Braunstein <whoizzy@xxxxxxxxxxxxx> wrote:
>
>> I current am using a gig of twin sets of Corsair PC6400 (ddr2-800)
>> (2x512) with 5-5-5-12 latency configured dual channel use. I have
>> just ordered another gig of ram, only this time it's OCZ's brand,
>> configured the same way (2x512). These are rated 5-5-5-10.
>>
>> Would anyone like to speculate as to what I can expect when I add
>> these OCZ sticks to my present system? They are both non ECC,
>> unbuffered chips. They are going to be installed as pairs, of course.
>> Not only am I interested in whether or not the system will boot, but
>> will I still have dual channel, interleaved mode?
>>
>> Thanks in advance
>> Richard
>
>Try this experiment. Place your current two sticks on the same
>channel. That will be running in single channel mode. If there is
>going to be a problem running a channel at DDR2-800, you can
>test before even opening the package on the new RAM. Run memtest86+
>and Prime95 torture test, as you adjust voltage and timing.
>
>955X DDR2-667 4 sticks
>http://www.anandtech.com/mb/showdoc.aspx?i=2412&p=4
>
>925X DDR2-533 4 sticks
>http://www.anandtech.com/mb/showdoc.aspx?i=2288&p=3
>
>Timing and voltage boost versus frequency for a single pair in DC
>http://www.anandtech.com/memory/showdoc.aspx?i=2306&p=9
>
>Although DDR2 has on chip termination, I would still
>expect a four DIMM configuration to feel the effects of
>having two DIMMs per channel. Whether the RAM can reach
>all the way to DDR2-800 should be an interesting
>experiment.
>
>Please post back your results, because most people try
>stuff like this (4 sticks) at only DDR2-533.
>
> Paul


I changed the topic of this thread, as there was a subtle post with
regard to this being [OT]. It is so true that the experience of
others is what this group is able. As this pertains to an Asus board
it is now officially not [OT] :-)

First off, this is a great motherboard. Being in my early 60's, and
with some of it's built in features not even out yet... I'll have this
motherboard for a long time. Things like 1066 FSB support, native
DDR2-800 support (PC6400), 8 GB memory capability. I can just say
this is an awesome board... pricey, but you get what you pay for is my
thinking in this case.

The Corsair's in single-channel work fine, as do the OCZ's. In
dual-channel configuration, using all 2GB, the system boots, and only
showing PC-6400 after changing, in the bios, AI Overlocking from Auto
to Manual. This allowed me to change the default, (for got what it
was) to PC-6400.

I am reluctant, and won't switch sticks in channel A1 and A2 or B1 and
B2 to mix the different brands. The manual warms to always install
DIMMs with the same CAS latency.

There was a noticeable difference in running 1 GB in single-channel or
dual channel, but adding another GB of ram to this system is awesome.

I have not run any diagnostics to see what the latency reports in
Windows. Scroll up and the Corsairs are 5-5-5-12, the OCS's 5-5-5-10.
I'm just reporting here that there were no problems running this in
dual-channel. Bios reports 2GB running at PC-6400 in dual-channel
mode. And this is naive... doing no overclocking.

Life is good.
Richard

.

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