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5930k with DDR 3000. Very strange reliability

post #1 of 2
Thread Starter 
I have been trying to get my 5930k overclocked and have experienced some weird results.

If I set my base clock to 100 and my strap to 100 I can easily do 4.5ghz at 1.35v stable. I can even game at 4.7ghz and 1.4v, but unreliably.

I have G.skill memory rated for 3000mhz at 15 16 16. So at 100 mhz strap and bclk the memory runs fine at 2400mhz at 4.5ghz 1.35v.

The strangeness happens when I change my bclk and strap to 125mhz to overclock my memory to 3000 using 24 multiplier on memory, I also change my cpu multiplier to 36 to get to 4500mhz at 1.35v stable. When I do this my system becomes unstable after 10 minutes of gaming or so. My first thought was my memory must not be able to run in spec, I dropped my timings to 17 17 17, still had the same result. I bumped up voltage to 1.38v, still unstable.

Then today I changed my strap and bclk to 166.6 , my cpu multiplier to 27 to get to 4.5ghz at 1.35v. My memory is at 3000mhz 15 16 16 at 1.35v with 18 multiplier. My system is completely stable!?

So my question is, what is up with the stability? Would changing the base clock and strap to 166mhz with the same output speeds for cpu and memory somehow make my system more stable than using the 125mhz ?

My initial thought is that the memory multiplier (24) for the memory is not very stable at 125mhz, it seems the memory prefers the 1:18 multipler at 166mhz to get to 3000 mhz, instead of the 1:24 multiplier at 125mhz to get to 300mhz.

Has anyone noticed memory multiplier having this type of effect on stability when not changing the operating speed of the memory? Are all memory multipliers not created equal for stability?

Thanks
post #2 of 2
Keep the RAM clock, timings and RAM voltage on the overclcok you had on them. Most likely you will need to increase the VCCSA (System Agent Voltage) to stabilize overclocked RAM on higher CPU overclocks.
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Gaming Computer
(19 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core 2 Quad Q6600 Asustek P5Q-PRO Nvidia 9800 GTX+ Kingston DDR2 8gb 
Hard DriveOptical DriveCoolingOS
Western Digital 1 TB Pioneer Noctua NH-U9B Windows 7 Ultimate 64-bit 
MonitorKeyboardPowerCase
Dell Monitor Logitech G110 Antec 750W Thermaltake Aluminium Old Case 
MouseMouse PadAudio
Logitech G500 Gaming Mouse Generic Mousepad Soundblaster 5.1 VX 
  hide details  
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