Current limit throttling

[alexandre.huber]

Hi everyone,

 

I would like to ask for your wisdom about the following recently built rig:

 

Intel core i9-7900X, ASUS X299 PRIME Deluxe, 4 x 16 Gb G.Skill Trident Z 3000 GHz, NZXT Kraken X62, NVidia Quadro K4000, Samsung SSD 512Gb

 

I'm quite happy with the performance. The temperature varies depending on the stress test (XTU, Prime 95, Blender). It is only the limiting factor with Prime 95's small FFT test. What concerns me is that I get throttling with many other tests du to "current limit". I don't think my settings are that crazy even for an non-delidded cpu (compared to what's reported online): Per number of core with 43x multiplier for 10 cores, 3x and 4x reductions for AVX and AVX512 operations respectively, no power limitation for turbo boost, Adaptive core voltage with undervolting -0.060 V (voltage varies between 1.060 and 1.130). With these settings I get constant current limit throttling according to XTU when running animation rendering in Blender for example.

 

 

I've tried the following tweaks with zero effect (no change in heat, reported clock speed or current limit throttling):

 

• Disabling SVID and SpeedStep
• Plugging both ATX12V EPS cables on the motherboard (8 pins + 4 pins)
• Extending VRMs current limit to 200%

 

Varying the processor current limit shows a porgressive reduction in heat and performance only drops when under 265-270W. Parameters remain constant above that threshold with current limit throttling always on according to XTU. Setting the voltage offset upwards only produces more heat without noticeable effect on clock speed or benchmarks. Setting core multipliers to lower values, such as 37x reduces heat output and voltage without turning current limit throttling off...

 

I've done extensive research online and I am out of ideas. Some reports suggest that there may be VRM throttling due to the relatively bad heat dissipation capacity. However I don't think that is the problem as my power draw seems to be limited at about 290 W (270 * 1.06 = 286) and reportedly this problem comes at 400W and above which I'll never even try to reach.

 

So... What are your suggestions? What could I test next? 

 

Thanks in advance for your help!

[Snipergod87]

Have you checked to see if there is a BIOS update that could fix this?

[Jurrunio]

What if you enter these settings into the BIOS rather than using XTU?

[alexandre.huber]

Thanks for the answers:

 

Snipergod87 --> I updated the BIOS to the last available version

 

Jurrunio --> The settings were actually entered both in the BIOS and XTU...

[alexandre.huber]

Any other idea?