Basic memory / FSB question

Guest2

Guest2

Guest2

Soldato
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6 May 2009
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My memory is at 11-11-11-27 1T

It is 1600mhz DDR3

My multiplier is 20 x 200fsb giving 4ghz

In CPUZ the DRAM Frequency is showing as 761.9mhz
FSB:DRAM 2:8

Is this correct or should it show 800mhz and something different to 2:8

It used to be far easier when cpu/memory was set to run 1:1
 
from what i can remeber, you will need to raise the fsb untill you are able to get 1600mhz in the bios for the ram, as it is now its slightly underclocked. is everything else in your system stable?
 
2 x 761.9 = 1523.8MHz, so yeah that's close enough. You could go up on the DRAM bootstrap, but you'd be overclocking your RAM quite heavily and would need to adjust voltage accordingly if it's even achievable. Or up your FSB if you aren't on the newer i3/i5/i7 chips, but this will affect your cpu speed as well.
 
Something is off somewhere.

If your FSB is 200MHz, and you FSB: DRAM ratio was 2:8, then the RAM would be running at 800MHz (doubled to 1600MHz for DDR).

(200/2)*8 = 800.

If I were to hazard a guess it would be that if you look at the CPU tab in CPU-Z it would only show your FSB as being ~190MHz.

(190/2)*8 = 760.

Also please fix or remove your sig as it's no longer displaying the correct image.
 
Last edited:
Sig now removed.

Its because apparently the code in CPU-Z 1.60.1 is knackered. 21 x 190.5 is showing with a qpi link of 3047.7

Coretemp reports correctly at 200 x 200

Thanks
 
Assuming its a Nehalem thing or something as hes using one as well (Qpi linkspeed). Shows fine on my SB and IB rigs as well.
 
It may just be with Lynnfield and others. reported by people on a couple of different forums

CPU-Z 1.50 reports 800mhz DRAM frequency, 1.60 version shows 762mhz. To do with max qpi link or bus speed or something
 
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