Hi,

I recently noticed my new xps 15 9550 is really slow. So I downloaded CPU-Z to take a deeper look. I found the multiplier of CPU is stuck at 8, no matter how much stress I put on the CPU by running stress test like prime64.

Then I tried to disabled SpeedStep in BIOS and the problem still remains.

Now I have to use ThrottleStop 8.00 to force the multiplier to 26 in order to get get the normal performance. In ThrottleStop I had to uncheck BD PROCHOT option in order to force the multiplier. According to ThrottleStop document, BD PROCHOT stands for Bi-Directional Processor Hot. This allows other items to signal the CPU to tell it that the CPU is hot and that it should throttle even when it isn't. It might be the GPU or the power regulator when it gets too hot or starts putting out too much power that signals the CPU to throttle and conserve power and cool down the overall system temperature.

Is this a known issue? Is there a good solution instead of relying on ThrottleStop?

=====Attached CPU-Z report.

Processor 1 ID = 0

Number of cores 4 (max 😎

Number of threads 8 (max 16)

Name Intel Core i7 6700HQ

Codename Skylake

Specification Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz

Package (platform ID) Socket 1440 FCBGA (0x5)

CPUID 6.E.3

Extended CPUID 6.5E

Core Stepping R0

Technology 14 nm

TDP Limit 45.0 Watts

Tjmax 100.0 °C

Core Speed 798.0 MHz

Multiplier x Bus Speed 8.0 x 99.8 MHz

Stock frequency 2600 MHz

Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x, AES, AVX, AVX2, FMA3, TSX

L1 Data cache 4 x 32 KBytes, 8-way set associative, 64-byte line size

L1 Instruction cache 4 x 32 KBytes, 8-way set associative, 64-byte line size

L2 cache 4 x 256 KBytes, 4-way set associative, 64-byte line size

L3 cache 6 MBytes, 12-way set associative, 64-byte line size

FID/VID Control yes



Turbo Mode supported, enabled

Max non-turbo ratio 26x

Max turbo ratio 35x

Max efficiency ratio 8x

O/C bins none

Ratio 1 core 35x

Ratio 2 cores 33x

Ratio 3 cores 32x

Ratio 4 cores 31x

TSC 2592.0 MHz

TSC_24 24.0 MHz

APERF 798.2 MHz

MPERF 2594.0 MHz

IA Voltage Mode PCU adaptive

IA Voltage Offset 0 mV

GT Voltage Mode PCU adaptive

GT Voltage Offset 0 mV

LLC/Ring Voltage Mode PCU adaptive

LLC/Ring Voltage Offset 0 mV

Agent Voltage Mode PCU adaptive

Agent Voltage Offset 0 mV

Temperature 0 41°C (105°F) [0x3B] (Core #0)

Temperature 1 43°C (109°F) [0x39] (Package)

Power 0 4.12 W (Package)

Power 1 1.90 W (IA Cores)

Power 2 0.06 W (GT)

Power 3 2.15 W (Uncore)

Power 4 1.28 W (DRAM)

Voltage 0 0.80 Volts (VID)

Voltage 1 +0.00 Volts (IA Offset)

Voltage 2 +0.00 Volts (GT Offset)

Voltage 3 +0.00 Volts (LLC/Ring Offset)

Voltage 4 +0.00 Volts (System Agent Offset)





