X5650 Turbo(23x) causes high cpu core voltage fluctuations!

[mysticjbyrd]

I set Vcore to 1.336v in bios. However, I am seeing huge fluctuations in hwmonitor at idle from 1.184 to 1.472. When I look at the figure in the bios, it's rock solid.

The boost is drastically increasing the voltage on this x5650 cpu.

Is a 0.15v fluctuation from boost normal for this cpu?

 

[Techhog]

What CPU? And do you have it set to fixed voltage, or adaptive?

 

[mysticjbyrd]

x5650

The bios only lets me use an offset. It's currently set to +260mv, and stock was about 1.076v.

I tried lowering voltage, but then my 200 bclk OC becomes unstable.

 

[mysticjbyrd]

Should I turn off the boost, and manually try to go higher?

I am currently running 190 BCLK, because I didn't find a 200 that was stable, and I didn't like the voltage jumping up to 1.48v under load. At 190, I could drastically decrease voltage (-0.1v), and now it only spikes to 1.384v, which still seems a little high, but I think it should be okay.

I am thinking about leaving it like this, assuming it's fully stable. A little disappointed, I thought 200 bclk would be easy to attain. I might have inverse won the silicon lottery.

 

[ClockHound]

What are your temps? What cooler and motherboard are you using?

Sounds like your 5650 has hit the voltage wall, but not too hard. My 5660 requires much more to hit 4.6Ghz. My 5675 rig less, but its sweet spot is 4.4 at 1.32V in a Sabertooth using offset. Temps hit 60c with a D15 in a high airflow modified XB case.

Staying under 1.4V is safest. But, Burpo will probably jump in here and tell you that real manly Xeon overclocks start at 1.5V. ;-)

 

[mysticjbyrd]

What are your temps? What cooler and motherboard are you using?

Sounds like your 5650 has hit the voltage wall, but not too hard. My 5660 requires much more to hit 4.6Ghz. My 5675 rig less, but its sweet spot is 4.4 at 1.32V in a Sabertooth using offset. Temps hit 60c with a D15 in a high airflow modified XB case.

Staying under 1.4V is safest. But, Burpo will probably jump in here and tell you that real manly Xeon overclocks start at 1.5V. ;-)

It's a closed water cooler with 140mm radiator. It came from dell, so I am not sure as to what the specif model is, but it's certainly not the best.

Maximum temperature under Aida64 stability test for 7 minutes,
71 68 67 66 72 71

Average was more like 65.

I am using the arctic silver 5 thermal paste, and it takes awhile to set, so the temperatures might drop some more.

lol probably.

CPUz Benchmark
1531
8775

Which is probably fairly close to the 5820k at stock.