Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
In article <XbTRc.189151$tH1.9187451@twister.southeast.rr.com>, "Navid"
<nospam@nospam.invalid> wrote:
> "Paul" <nospam@needed.com> wrote in message
> news:nospam-0908041703090001@192.168.1.177...
> > In article <52d47740.0408091108.35d07e11@posting.google.com>,
> > normanlam@gmail.com (Norman) wrote:
> >
> >> I currently have the Asus P4P800-Deluxe and two Kingston
> >> KVR400X64C3/256 installed (512MB total) running in dual-channel mode.
> >> I want to bump up the ram to 1GB by adding another 2 pieces of 256MB.
> >> After some searching, I notice that most of the store only carries
> >> KVR400X64C3A/256 and not KVR400X64C3/256. And for those store that do
> >> carry the KVR400X64C3/256, there's a price difference of at least $10
> >> higher compare to the KVR400X64C3A/256.
> >>
> >> I've heard this motherboard is very picky when it comes to using 4
> >> sticks of ram. What's the difference between KVR400X64C3/256 and
> >> KVR400X64C3A/256? Can I mix two sticks of KVR400X64C3/256 with two
> >> sticks of KVR400X64C3A/256 and still be running in dual-channel mode?
> >
> >
http://www.valueram.com/Tools/Datasheets.asp
> >
> >
http://www.valueram.com/datasheets/KVR400X64C3_256.pdf
> >
http://www.valueram.com/datasheets/KVR400X64C3A_256.pdf
> >
> > C3A has slightly faster Trc. Clock period 5 to 10ns, means it
> > runs from DDR200 to DDR400. By default your motherboard applies
> > at least 2.6V, so no problems there. C3A appears to run cooler
> > as well - less watts of power.
> >
> > From an end user perspective, no significant difference I can see.
> > Unless it is known in some overclocking group, that the chips
> > on one module are better overclockers than the other, I don't
> > see a $10 difference.
> >
> > As usual, match the pairs across the channels properly. A1=B1 and
> > A2=B2, as per the manual.
> >
> > HTH,
> > Paul
>
> Paul,
>
> According to ASUS, the motherboard does not support 4 modules of this memory
> inserted into both blue and black slots.
>
http://usa.asus.com/products/mb/socket478/p4p800-d/P4P800_DDR400_QVL.pdf
>
> Navid
A fair enough comment. What do you make of the fact that a Hynix
single sided module with D43 ram on it works in four slots, and
a Kingston single sided module with Hynix D43 chips on it doesn't
work in four slots. Does that build your faith in Asus ability to
test ?
256MB Hynix HYMD232646B8J-D43 AA Hynix SS HY5DU56822BT-D43 V V V
256MB Kingston KVR400X64C3A/256 hynix SS HY5DU56822BT-D43 V V -
You can also compare two double sided modules with hynix to
four single sided modules, and again the results aren't consistent,
although the number of memory chips involved is the same.
As a tie breaker, th OP could phone up Kingston and see if the ram
is made with more than one kind of chips. Perhaps they have a version
of C3A they ship to owners of P4P800/P4P800_Deluxe ? They might know
if there is an issue with Hynix chips and not with some other.
(Valueram uses more than one kind of memory chip.)
Asus doesn't document their test method or their sample size. I would
place more weight on their results, if I knew how they got them. If
the results said "2 of 76 modules tested failed", then we would know
how large a sample size they used.
Diff between C3 and C3A - 3-4-4 versus 3-3-3 timing.
http://www.abxzone.com/forums/showthread.php?t=52486
Memory tested by Intel on D865PERL - C3/C3A listed:
http://www.intel.com/design/motherbd/rl/rl_internalmem.htm
HTH,
Paul
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