[vincentmoy]

So I have the system stated as in my signature.

Last night I was trying to make the ram go little faster. (CPU: 170x21, RAM is running 1020Mhz)

so I tried to clock the CPU @ 200x18, QPI clock ratio is 32x, Manually set the Memory to spec 8-8-8-24, memory multiplier to 8x and bump the vcore to 1.25, vtt to 1.21, vdrm to 1.64. I try to run some stress test and the system becomes so unstable that I need to drop it back to what I have originally.

Can anyone give me some idea what I did wrong?

 

[pcguy5]

you won't be able to get a stable overclock if you are using 200 bclk. bump it down to 190's and work from there.

 

[Salami991]

Doesn't the i5 need a little more vcore than 1.25? And here I was thinking 1.32 was too low for 3.8.

 

[willis888]

When I was OCing my i5, it started to get unstable at about 190 base clock and I needed at least 1.275 vcore to pass linpack at 3.3 GHz.

Try 180x20 at 1.35 vcore (or however high you are willing to go), and then slowly work the voltage down as far as it will go.

 

[vincentmoy]

Do I need to change QPI clock ratio? I'm happy with 3.6 really... I just wanna make my RAM runs faster. It's only running 510Mhz right now.

 

[Salami991]

I set X.M.P in the bios and worked my settings from there, kept QPI at 6407mhz and ram at 1600mhz, adjusting bclock and multiplier to keep the 1600 ram speed, try upping your IMC a little if you're finding the overclock is unstable, mine's at 1.2V at the moment, so just under Intel's max recommendation.