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Memory Timings

post #1 of 6
Thread Starter 
Hello, i want to add 2 more sticks of 1gb ram to my system.
My current 2 gigs are 1066mhz but my motherboard supports only up to 800 (i know, its a fault with the building) so its running on 800mhz (CPU-Z).
CPU-Z also says that its timings are 5-5-5-18, but as i googled my memory code, which is KVR1066D2N7/1G, i found that they are CL7. http://www.valueram.com/datasheets/kvr1066d2n7_1g.pdf
My question is, does the timings changed because the memory speed reduced from its origin 1066mhz speed? and what memory i should buy to suit the ones i have, or what is the critical specifications for matching memory cards.
Thank you!
Edited by KD14 - 1/9/12 at 2:57am
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 2.4Ghz Intel DP35DP ASUS 8800GT 512MB DDR3 2x Kingston 1GB DDR2 1066Mhz 
Hard DrivePowerCase
WD 500GB SATA3 ATX-450 JSP Briza E-6097 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 2.4Ghz Intel DP35DP ASUS 8800GT 512MB DDR3 2x Kingston 1GB DDR2 1066Mhz 
Hard DrivePowerCase
WD 500GB SATA3 ATX-450 JSP Briza E-6097 
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post #2 of 6
Usually ram will have different timings for different speeds.

ie, an 800mhz 1GB stick of DDR2 may have stock timings of 6-6-6-18 @ 800Mhz, but 5-5-5-16 @ 667Mhz etc.

I would try to find a matching pair to run in either channel A or B. Since your board only supports 800Mhz, you can either go for 2x 1066mhz sticks so if you upgrade your board in the future, you can utilize the 1066Mhz speed on all 4 sticks. Or grab a pair of 800Mhz sticks since your board will only go 800Mhz anyways.
post #3 of 6
Thread Starter 
Thanks
What about the latency, does it have to match?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 2.4Ghz Intel DP35DP ASUS 8800GT 512MB DDR3 2x Kingston 1GB DDR2 1066Mhz 
Hard DrivePowerCase
WD 500GB SATA3 ATX-450 JSP Briza E-6097 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 2.4Ghz Intel DP35DP ASUS 8800GT 512MB DDR3 2x Kingston 1GB DDR2 1066Mhz 
Hard DrivePowerCase
WD 500GB SATA3 ATX-450 JSP Briza E-6097 
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post #4 of 6
I've used ram sticks with different CAS latency before, it shouldn't be a problem. The mobo will just run at the speed and timings of the worst stick in the system.

Exampe: You have 3x 1Gb 1066mhz sticks @ 4-4-4-12 and 1x 1Gb 667mhz stick @ 6-6-6-18. All your ram will run at 667Mhz @ 6-6-6-18 because that's the slowest stick of the bunch.
post #5 of 6
Thread Starter 
Thank you very much!
I have another question, i wonder if someone can answer that.
Is my latency realy reduced from 7 to 5 because it runs on lower mhz?
If so, may i use another 1066mhz sticks though my botherboard supports only 800mhz, so the latency will be better and it will still be worth the higher specs?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 2.4Ghz Intel DP35DP ASUS 8800GT 512MB DDR3 2x Kingston 1GB DDR2 1066Mhz 
Hard DrivePowerCase
WD 500GB SATA3 ATX-450 JSP Briza E-6097 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 2.4Ghz Intel DP35DP ASUS 8800GT 512MB DDR3 2x Kingston 1GB DDR2 1066Mhz 
Hard DrivePowerCase
WD 500GB SATA3 ATX-450 JSP Briza E-6097 
  hide details  
Reply
post #6 of 6
Yes, the CAS latency is reduced from 7 to 5 because its a lower speed. I would say you could use two more 1066mhz sticks, but they (all the sticks) will run at 800Mhz @ CAS 5 latency. Depending on your OS, just adding another 2gb or ram would be an upgrade.
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