Cycle time 24. Row refresh 88 clocks?

[gregdpw]

i just recently overclocked my cpu on my asus p6t motherboard. I chose to overclock my 1600 ddr3 ram to 1726 MHz. But why does my cycle time say 24 clocks. And row refresh cycle time says 88 clocks?

I have my bios in manual mode. Everything is in auto except for the cpu and the memory.

 

[Pinhedd]

i just recently overclocked my cpu on my asus p6t motherboard. I chose to overclock my 1600 ddr3 ram to 1726 MHz. But why does my cycle time say 24 clocks. And row refresh cycle time says 88 clocks?

I have my bios in manual mode. Everything is in auto except for the cpu and the memory.

Those look fine to me. What's the question exactly?

 

[gregdpw]

Just wondering if that 88 is too high?

 

[Pinhedd]

Just wondering if that 88 is too high?

Nope. It's normal, and I suggest that you don't muck with it.

quoted from my soon to be published memory tutorial:

Trfc: Refresh Cycle Time. The minimum amount of time that must exist between an Auto-Refresh command and the first Row-Active or Auto-Refresh command issued to a bank on a DRAM IC. Trfc is very density-dependent. Since Trefi is constant at 7.8 microseconds and the retention time is constant at 64 milliseconds high density DRAM chips must refresh multiple rows during each auto-refresh cycle. This is performed by using multiple subarrays inside of each memory array and refreshing one row per subarray during each auto-refresh cycle. Higher density chips are still subject to the same current draw limits as smaller density chips, so refreshing higher density chips takes longer because a greater number of subarrays need to be refreshed using the same amount of current.

88 clocks at 863.4 Mhz works out to about 102 nanoseconds. 100 to 110 nanoseconds is typical for a 1 gigabit DDR3 chip and using the screenshot that you posted I can make an educated guess that you're running just that.

 

[gregdpw]

Would the screenshot be pretty simalar if I added another 6 gigs to my existing 6 gigs? So a total of 12 gigs

 

[Pinhedd]

Would the screenshot be pretty simalar if I added another 6 gigs to my existing 6 gigs? So a total of 12 gigs

If they were the exact same modules yes, but the command rate may rise to 2T