CZ Platinum DDR2 1066 only runs at 800MHz

wallyinnc said:

Some time ago I installed OCZ Platinum 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 OCZ2P10664GK in my system.

Theoretically it should run at 1066MHz, but it only runs at 800MHz. Motherboard (Asus M4A78 plus) manual says it supports DDR2 1066 with AM2+ / AM3 sockets, I have a AMD Athlon II X2 245 Regor 2.9GHz 2 x 1MB L2 Cache Socket AM3.

Mobo manual also says it will only support 1066 with one DIMM per channel. I tried in dual channel, one DIMM per channel and only one DIMM (only 2GB), no change.

I have tried some Overclocking settings (5-5-5-18; 2.2V; 533MHz), but all I get is the system refusing to boot

Am I missing something? Is it supposed to work at 1066MHz or not?

Thanks in advance

Hi Wallyinnc,

I suppose I have a similar hardware than you.

m4a78 - standard
2 x 2 OCZRPR10664gk - its the REAPER model
phenom II 720

both links at asus website to memory QVL list are dead so I've requested an update list to them last weekend and that's what about your memory:

OCZ2P10664GK
a. supports one module inserted in any slot as single-channel memory configuration
b.DOES NOT suport one pair of modules into the yellow slots or the black slots as one pair of dual cannel memory configuration
c.supports 4 modules inserted into both the yellow and black slots as two pairs of dual channel

by my understanding you will be able to use 2x2 at 1066 only in single channel and if you wanto to run dual you should stay at 800MHz
so as they states you will not be able to use 2x2 1066 in dual channel - that's why I've choosed the REAPER OCZRPR10664GK model wich meet the requirements to run at 2x2 1066.

If you want the QVL list for M4a78 send me a PM or contact ASUS support.

I hope that clarifies things for you.

cheers

edit:

be sure you are using the latest bios of your board - they improve the memory setup at board
I suppose if you buy another 2 modules you can use all 4 at 1066 but I can't promisse you that

hey, nice to see you are also from Sao Paulo - Brazil - I didn't notice that.

forget the OC by the moment, first you have to make sure you can run in 1066 in single channel with minimum changes at bios. as you have stated your modules are fine cause you've performed memtest at 800 - thats fine

just make sure you have the latest bios - in my M4a78 standard it's the 1206
so you will stick one module at yellow slot and another at black slot (single channel) and with your bios defaults check if you are stable at 800 - that will certify your slots are error free
if you pass that you should go to bios (wich are in default) and set your memory frequency from AUTO to MANUAL and set the frequency to 533 (will give you 1066) let all other options of timming in AUTO including the voltage (auto) - dont mess with bios right now - only setup mannualy the frequency 533 - it has to work as mine did it! save bios and reboot - check if post shows 1066. thats it!

if you are using an AMD x2 it can handle DDR2 at 1066 speed - that's what I am read on a google search its good to check at amd's website. the limit is imposed by your board wich can allow you to run 1066 only at single channel with 2 memory modules.


I've sent you the updated QVL list on email

godspeed and report your progress
cheers

Hi Fabe,

once the Mother board manufacter assures you that its specific MB can run at 1066MHz by default there ain't no need to tweak or setup the bios. I did my homework and took care to choose a 1066 model wich is listed at QVL (qualified vendor list) of ASUS. that assures wich ASUS worked togheter OCZ to certify that memory will run it at 1066 by default (wich is my case-look at pic).
I can push my memories to 1120MHz using default timings (5-5-5) totally stable because my MB supports OC 'til 1200MHz. I can push it to 1200 if I use timmings 7-7-7 but its not smart.
Wallyinnc bought memories wich are certified only in part (itens a and c). but ASUS assures he can make it 1066 at single channel only... there is no mistakes.
regarding other motherboards and other memories modules I don't know.. you have to pick the information in each vendors website and match it to be 100% sure.

I am a bit concerned that discussion is not windows 7 related. I sugest we discuss it further over PMs if its needed.

regards.