DDR2:::: Better to run in one channel or two

beermugNY

Distinguished
Oct 31, 2011
2
0
18,510
Hi


I consider myself to be a middle of the road guy when it comes to computer knowledge, all book learned. However, im not too experienced in the "low level stuff".
I wanted to expand to 8GB memory, so i bought another 4GB kit of the Reapers [when OCZ still made memory] and tried to install. To my dismay, the comp would not boot. Now this memory required bios adjustments to run which i had already done when installing the first 4GB. Changed memory voltage from 1.8 to 2.1v as per OCZ, and also played around with the timings a little to get the desired 533mhz to achieve 1066mhz.
After ALOT of emails and searching online i found out that AMD cpu's had a limitation [the cpu internal memory controller is designed to run memory at 1066 or higher speed "only in one channel"!! P.O.'d i returned the second 4GB kit to the vendor, and continued running only 4GB to this day.
Since that time i have made some changes in habit when using the pc. I spend alot more time running streaming video at times i might run as many as 2 or 3 in 2 different browsers, until i started getting BSOD's.....................................
So, im thinking its one of two things. Either my mainboard design cant handle the load of all that data demand, or , i need more memory.
Now i find out that OCZ is out of the memory business so im left to finding some of the slim pickins on Ebay. Or go to a different brand.
I had an idea, noticed that a couple of manufacturers still make 4GB sticks of DDR2 pc-8500 memory. Im curious if i can use 2 of them to make a total of 8GB running in one channel [which would replace my current 4GB of OCZ Reaper memory].
Or, do i need to get 8GB of pc-6400 800mhz and run the pc slower than before, but be able to make use of both channels [i.e. 2GBsticks x4 slots]?

Any idea as to which direction i should go on the memory?

Sorry for the long winded story but i thought explaining my case would be of some use.

Gigabyte GA-MA790GP-UD4H board
AMD Phenom II x3 2.5Ghz cpu [3cores]
OCZ Reaper PC-8500 1066mhz memory 4GB kit in single channel @ 2.1volts
Asus EAH5670 video adapter 775mhz 400stream processors 128bit 1GB GDDR5
Asus Xonar DX sound card
Western Digital Caviar Green 500GB Hard Disk
Thermaltake 450watt PSU
 

phatbuddha79

Distinguished
Aug 8, 2009
228
0
18,690
I remember reading an article way back in the days of DDR1 and they benchmarked the two, turns out the difference is 2-3% and in some cases more. Also, what from I have seen there is not much difference if any at all between 800mhz and 1066 ram.
 

beermugNY

Distinguished
Oct 31, 2011
2
0
18,510


the idea is to increase the amount of memory on the board to 8gb.

anyway did a little research called AMD tech support, they said if i change to a PhenomII cpu that has the C3 revision, that one has the enhanced internal memory controller and will support 1066mhz in dual channel mode supporting 4 sticks 2 per channel. The mothboard supports the OCZ Reaper memory requirement for 2.1volts.

I also noticed something else to note: some phenomIIs have a price drop, [because they are being made without an L3 cache!!!!!
model numbers are the same, the difference is in the part number something to be aware of it you shop if you want a cpu with L3 cache.

model 955 with L3 cache HDX955FBGMBOX
model 955 without L3 cache HDZ955FBGMBOX