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Upgrading dual-channel DDR3 Ram

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Got this in my PC:

Memory slots
Total memory slots 4
Used memory slots 3
Free memory slots 1
Type DDR3
Size 6144 MBytes
Channels # Dual
DRAM Frequency 665.1 MHz
CAS# Latency (CL) 9 clocks
RAS# to CAS# Delay (tRCD) 9 clocks
RAS# Precharge (tRP) 9 clocks
Cycle Time (tRAS) 24 clocks
Command Rate (CR) 2T

Need to upgrade from current 6GB to 8GB minimum. Can someone link to something on ebay, amazon or elsewhere to something that would do the job.

I'm assuming (without reason) that if 3 of my 4 memory slots are used, I must have 3 x 2GB in there and that I 
a) have to buy a 2GB memory thingy or can I 
b) stick a 4GB memory thingy in there, or can I 
c) have a 2 x 2GB memory thingys and then stick 2 x 4GB memory thingys in there?

Also, does any new memory thingy also need to be ruuning @ 665MHz?

Don't try and explain more than the very basic, I'd prefer a link to a product on ebay if poss as it's often cheaper than amazon for this stuff.

Thanks in advance, I'm lost here...


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:welcome:   SaqibKhan,


Don't try and explain more than the very basic,



We wouldn`t have to if we had all of the info we needed to be able to suggest the correct RAM for you  :P


Joking apart, looking at the info in your OP it suggests that you have a desktop PC and need a single 2GB stick of Cas latency 9 DDR3 1333MHz RAM, problem is we don`t know what voltage the present RAM is or whether or not you have two sticks of 1600MHz RAM and one stick of 133MHz RAM that is forcing the faster 1600MHz RAM to clock back to 1333MHz.


Use the Crucial system scanner tool here to find the best recommended RAM for your system, no need to purchase from there, write down the details, let us know what is suggested and we can take a look for you. 

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