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cpu oc and ram syncro

ppdemo

Member
Jan 13, 2017
27
0
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hi all, i need help about the next:
first of all i have a i7 4790k OC at 4.5ghz and a 2400 cas11-13-13-31-2T gskill ram with xmp profile enabled so my question is how i sync the ram with the OC cpu.
should i set timings and else, manually or directly OC a little more the ram? i ask this because think that i have not still a correct synchronization between cpu and ram, this although xmp profile is like i have set in bios. i hope you answer regards my friends...
 
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Yuriman

Diamond Member
Jun 25, 2004
5,531
141
106
There's no such thing as FSB anymore, memory controllers were moved on-die more than a decade ago, so there's nothing to synchronize with.
 

Tuna-Fish

Golden Member
Mar 4, 2011
1,052
630
136
Proper RAM/CPU sync was something that mattered quite a bit way back when all memory transfers went over the FSB. That no longer happens -- these days, the memory has it's very own dedicated link from the memory controller on the CPU to the ram. The systems are independent, best results are found simply when both the ram and the cpu are running as fast as possible.
 

2is

Diamond Member
Apr 8, 2012
4,294
129
106
As mentioned, this was only an issue back when there was an FSB. What is sometimes referred to as a FSB today is nothing more then a base, or reference clock. It doesn't actually do anything, it's just a reference clock used to calculate the clock speeds of the CPU/RAM etc.
 

ppdemo

Member
Jan 13, 2017
27
0
36
thank all now everything is more clearer to me but i have another doubt maybe this has nothing related , but this is:
dram ratio 100:100 / 100:133 or auto in bios. which should i choose?
 

Yuriman

Diamond Member
Jun 25, 2004
5,531
141
106
Whichever one results in your RAM running at the correct frequency. RAM is usually very sensitive to overclocks and even going slightly higher than its rated may result in bluescreens and instability.
 
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