Doubt on Memory speed

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Doubt on Memory speed

Postposted on Thu Sep 08, 2011 5:53 am

Hi Team,

Based on my CPU-Z report , it show that my memory was running at
RAM : 4096 MB DDR3 Dual Channel
RAM Speed : 668.9 MHz (3:10) @ 9-9-9-24
Slot 1 : 2048MB (10700)
Slot 1 Manufacturer : Noname
Slot 2 : 2048MB (10700)
Slot 2 Manufacturer : Noname

it was the muskin Silverline 1333 CL9 , was this memory running in lower speed ?

I also plan to upgrade 2 pair of 4GB so that it complete my machine and i able to run few more VM instance too , can anyone advice also on this ?
mghong
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Re: Doubt on Memory speed

Postposted on Thu Sep 08, 2011 7:30 am

mghong wrote:RAM Speed : 668.9 MHz (3:10) @ 9-9-9-24

it was the muskin Silverline 1333 CL9 , was this memory running in lower speed ?

I don't see where you are misled to thinking your ram is running at a lower speed?

DDR3-800 (PC3-6400) = 400MHz
DDR3-1066 (PC3-8500) = 533MHz
DDR3-1333 (PC3-10600) = 667MHz which is what your CPU-Z is reporting.
DDR3-1600 (PC3-12800) = 800MHz
DDR3-1866 (PC3-14900) = 933MHz
DDR3-2133 (PC3-17000) = 1067MHz
thegleek
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Re: Doubt on Memory speed

Postposted on Fri Sep 09, 2011 12:04 pm

thegleek wrote:
mghong wrote:RAM Speed : 668.9 MHz (3:10) @ 9-9-9-24

it was the muskin Silverline 1333 CL9 , was this memory running in lower speed ?

I don't see where you are misled to thinking your ram is running at a lower speed?

DDR3-800 (PC3-6400) = 400MHz
DDR3-1066 (PC3-8500) = 533MHz
DDR3-1333 (PC3-10600) = 667MHz which is what your CPU-Z is reporting.
DDR3-1600 (PC3-12800) = 800MHz
DDR3-1866 (PC3-14900) = 933MHz
DDR3-2133 (PC3-17000) = 1067MHz


Ooo.. i though it was 1333 but now it look like an 667MHz ,

Shall i also buy in another 2 pair of DDR ram for my PC if yes which set is compatible ?
mghong
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Re: Doubt on Memory speed

Postposted on Fri Sep 09, 2011 2:04 pm

mghong wrote:Ooo.. i though it was 1333 but now it look like an 667MHz

I don't think any current RAM (DDR3 even) goes up to 1333MHz clock speed, but alas, the upcoming DDR4 RAM sticks are expected to be introduced at clock speeds of 2133 MHz, estimated to rise to a potential 4266 MHz!!!

mghong wrote:Shall i also buy in another 2 pair of DDR ram for my PC if yes which set is compatible ?

Yes! Go with a pair that's rated the highest clock speed according to your budget! Always MAX your mobo out! An 8 gig set of DDR3 runs ya $40~50 these days! CHEAP!
thegleek
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Re: Doubt on Memory speed

Postposted on Sat Sep 10, 2011 1:56 am

DDR = double data rate = data transmitting on the rising and falling edges of the clock.

So the base clock is at 667MHz, doubling the data rate you get an "effective" rate of 1333MHz.
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Re: Doubt on Memory speed

Postposted on Sun Sep 11, 2011 8:50 am

Flying Fox wrote:DDR = double data rate = data transmitting on the rising and falling edges of the clock.

So the base clock is at 667MHz, doubling the data rate you get an "effective" rate of 1333MHz.


Effective rate ?? you mean 2 pair of 667Mhz in total of 1333 ahahah. :)

my mbox can support from these ranges
4 x DIMM, Max. 16GB, DDR3 2000(O.C.)/1600/1333/1066 Hz ECC, Non-ECC, Un-buffered Memory

Sound good to boost the performance again to take advantage of cheap memory..
mghong
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Re: Doubt on Memory speed

Postposted on Sun Sep 11, 2011 9:16 am

mghong wrote:
Flying Fox wrote:DDR = double data rate = data transmitting on the rising and falling edges of the clock.

So the base clock is at 667MHz, doubling the data rate you get an "effective" rate of 1333MHz.


Effective rate ?? you mean 2 pair of 667Mhz in total of 1333 ahahah. :)

my mbox can support from these ranges
4 x DIMM, Max. 16GB, DDR3 2000(O.C.)/1600/1333/1066 Hz ECC, Non-ECC, Un-buffered Memory

Sound good to boost the performance again to take advantage of cheap memory..

No. "Effective" rate is more marketing. Nothing about pairing and dual channel. A DDR ram stick usually is 64 bits wide, pairing 2 sticks in dual channel mode allow data to be transmitted 128 bits at a time. A crude analogy is highway traffic, there is the speed parameter, and also the number of lanes. Both have an effect of "how many cars per unit of time can pass through the highway".

In the old days, circuits usually just transmit data on one edge of the clock, either on the rising or falling edge. So once they figure how to transmit data also on the other edge, they "effectively" double the rate, but not the clock. But you know marketing always likes bigger numbers, so you see 1333 being used. Please read up on what double data rate means.
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