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Asus X79 Sabertooth VRM temps almost 100°!

Last response: in Overclocking
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May 29, 2013 8:53:00 AM

Hey everyone, I've noticed that, with AI Suite Thermal Radar, the vcore temp is actually the VRM's above the CPU socket. During Prime95 stress testing, they eventually get up to and fluctuate between 80-96°C depending on the FFT size. I have two 140mm fans in the front (intake), a 140mm at the bottom (intake), and a 140mm at the back (exhaust). My CPU cooler is the H100i exhausting air out the top with two 120mm fans.

CPU: 3930K @ 4.6Ghz
RAM: 16GB Corsair Vengeance (4x4GB)

Digi-Power page:
LLC: Medium (25%)
Everything else: Auto/default

OC page:
OC type: Auto
BCLK: 100
Turbo: 46
DDR: 1600Mhz
VCORE: offset + 0.010
VCCSA: 1.1v
VTTCPU: 1.1v
Everything else: Auto/default

My Vcore voltage in CPU-Z never goes above 1.334v during Prime and my CPU core temps never get above 82° (depending on FFT size).

So with my voltages being very reasonable and my LLC only at Medium, why are my VRM's getting so hot? Is there a setting in Digi-Power that, when left on Auto cranks up a voltage that makes the VRM's run extra hot? I would think I have great cooling in my case with all the fans. My VCCSA temp only gets into the mid-70's max. So what gives with my VRM (Vcore) temp hitting 96° at times? It actually got up to 98° once and I noticed that my CPU throttled to 3.2Ghz briefly and then back up to 4.6Ghz. It did this a few times until I stopped Prime. My actual cpu core temps were in the low 70's at that point.

I've noticed that with gaming, 3d rendering, video encoding, compositing, etc....the VRM's never get above 80° - only with Prime95. So should I even worry about it?
a b à CPUs
May 29, 2013 1:29:32 PM

The first and simplest approach - what case do you have and where is the rad mounted? Most common issue with WC and OC is VRM's are either blocked from airflow, or simply not getting enough. CPU coolers generally provide air to the VRMs next to the CPU socket. When u swap for WC, people often forget this
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a b à CPUs
May 29, 2013 2:59:40 PM

krazynutz said:
Hey everyone, I've noticed that, with AI Suite Thermal Radar, the vcore temp is actually the VRM's above the CPU socket. During Prime95 stress testing, they eventually get up to and fluctuate between 80-96°C depending on the FFT size. I have two 140mm fans in the front (intake), a 140mm at the bottom (intake), and a 140mm at the back (exhaust). My CPU cooler is the H100i exhausting air out the top with two 120mm fans.

CPU: 3930K @ 4.6Ghz
RAM: 16GB Corsair Vengeance (4x4GB)

Digi-Power page:
LLC: Medium (25%)
Everything else: Auto/default

OC page:
OC type: Auto
BCLK: 100
Turbo: 46
DDR: 1600Mhz
VCORE: offset + 0.010
VCCSA: 1.1v
VTTCPU: 1.1v
Everything else: Auto/default

My Vcore voltage in CPU-Z never goes above 1.334v during Prime and my CPU core temps never get above 82° (depending on FFT size).

So with my voltages being very reasonable and my LLC only at Medium, why are my VRM's getting so hot? Is there a setting in Digi-Power that, when left on Auto cranks up a voltage that makes the VRM's run extra hot? I would think I have great cooling in my case with all the fans. My VCCSA temp only gets into the mid-70's max. So what gives with my VRM (Vcore) temp hitting 96° at times? It actually got up to 98° once and I noticed that my CPU throttled to 3.2Ghz briefly and then back up to 4.6Ghz. It did this a few times until I stopped Prime. My actual cpu core temps were in the low 70's at that point.

I've noticed that with gaming, 3d rendering, video encoding, compositing, etc....the VRM's never get above 80° - only with Prime95. So should I even worry about it?


if it's only Prime95, don't worry about it. you've clearly over clocked your CPU just about as far as you can, and that and the insane amount of load Prime95 puts on your CPU cores is what's making the VRMs so hot. just as CPU core temperatures are never as high during normal use as they are during a Prime95 stress test, the same goes for VRMs. VRMs can withstand a bit more heat than CPU anyway, and with your normal temps being 80C or so, I think you're fine
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