Need help with ram timings

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harryberry272

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May 27, 2017
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I have 2 sticks of 4 GB ram pc2-6400u-666-12-e3 and can't get them to run at 800mhz I believe this is due to the timing but I am new to ram timings so I'm not completely sure how to set it up if anyone can help that would be great
 
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brispuss

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Dec 27, 2014
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Download, install and then run CPU-Z.

Under CPU-Z SPD tab, and if necessary select another memory slot at the top left of CPU-Z, take note of the timings and voltage for 400 MHz (this is the actual memory clock frequency; memory runs at twice this because it is DDR).

Note -

CAS# Latency (also known as CL, or t[sub]CL[/sub])
RAS# to CAS# (also known as t[sub]RCD[/sub])
RAS# Precharge (also known as t[sub]RP[/sub])
tRAS (also known as t[sub]RAS[/sub])
Voltage

Boot into BIOS and enter the above values. Save settings and exit BIOS and reboot.
 
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harryberry272

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May 27, 2017
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cpu z wouldnt showed the spd as blank for both slots so i looked online and it said the best thing to do was to use AIDA64 instead and it should the current timings
this is what i got for 400 mhz
@ 400 MHz 6-5-5-16 (CL-RCD-RP-RAS) / 22-79-3-6-3-3 (RC-RFC-RRD-WR-WTR-RTP)

not too sure what the next step would be with these results

 
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harryberry272

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May 27, 2017
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I've set these settings but if I set 800mhz with them it just blue screens me but works with 400mhz

 
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Tolis_GR

Tolis_GR

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Mar 13, 2017
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I guess this ram works up to 1333 mhz, if the 666 on the trade symbolizes the rated frequency. Anything above 1333mhz is actually overclocking the ram and i doubt it will work but what you can primarily try to play with CAS latency (loosen the timing) and raise the voltage by 0.05 increments. Leave the rest as auto
 
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brispuss

Splendid
Dec 27, 2014
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The DDR2 memory (pc2-6400u-666-12-e3) is rated to run at 800 MHz. The "666" means the CL is "6", t[sub]RCD[/sub] is "6", and t[sub]RP[/sub] is also "6".

If CPU-Z doesn't show timings and voltages for the memory, then use either Aida64 or HWiNFO to find the t[sub]RAS[/sub] value and also the corresponding voltage for these timings at 800 MHz (= 400 MHz clock frequency).

Then enter the memory timings and voltage into BIOS.
 
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Tolis_GR

Tolis_GR

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Mar 13, 2017
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Cool. Didn't imagine that
 
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harryberry272

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May 27, 2017
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AIDA64 stated the tRAS as 16 so i set the timings as u said 6-6-6-16 and went though all the voltages available but all i got was blue screens or it would freeze on the splash screen any other ideas?
 
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