Argthtjtr

I have an Lenovo T440p with an Intel Core i5 4300M CPU. 8GB RAM, SSD running with Windows 7 (preinstalled).

The only thing I did not like about this laptop was the screen, which I replaced (the whole LCD unit - including the hinges) with a full-hd version. It was rather easy; I did not have to remove the CPU/GPU.

Recently I noticed is that the laptop has become really slow, especially running VMs. In task manager I can see that the CPU is many times at 100% on all cores. CPU-Z is reporting that the CPU is running at the lowest possible clock:

• Core Speed: 798.85 MHz


• Multiplier x8


• Bus Speed 99.87 MHz


• Core Voltage of 0.659 V

(full details at the end)

I have set Windows already to "Maximum Performance" in the energy settings. I have also taken out the battery and am running with the power adapter. I also set the Lenovo Power Manager to maximum performance. Sadly, no improvement.

What else can I try?

Processors Information

-------------------------------------------------------------------------



Processor 1         ID = 0

    Number of cores     2 (max 8)

    Number of threads   4 (max 16)

    Name            Intel Core i5 4300M

    Codename        Haswell

    Specification       Intel(R) Core(TM) i5-4300M CPU @ 2.60GHz

    Package (platform ID)   Socket 947 rPGA (0x4)

    CPUID           6.C.3

    Extended CPUID      6.3C

    Core Stepping       C0

    Technology      22 nm

    TDP Limit       37.0 Watts

    Tjmax           100.0 °C

    Core Speed      799.0 MHz

    Multiplier x Bus Speed  8.0 x 99.9 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       2 x 32 KBytes, 8-way set associative, 64-byte line size

    L1 Instruction cache    2 x 32 KBytes, 8-way set associative, 64-byte line size

    L2 cache        2 x 256 KBytes, 8-way set associative, 64-byte line size

    L3 cache        3 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     33x

    Max efficiency ratio    8x

    O/C bins        none

    Ratio 1 core        33x

    Ratio 2 cores       32x

    Ratio 3 cores       32x

    Ratio 4 cores       32x

    TSC         2596.8 MHz

    APERF           794.7 MHz

    MPERF           2581.1 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       55°C (131°F) [0x2D] (Core #0)

    Temperature 1       59°C (138°F) [0x29] (Package)

    Power 0         11.12 W (Package)

    Power 1         1.54 W (IA Cores)

    Power 2         0.24 W (GT)

    Power 3         9.34 W (Uncore)

    Power 4         0.88 W (DRAM)

    Voltage 0       0.66 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

)

After many trial & error attempts, I found out what the issue was: My Laptop (cannot confirm if all Lenovo Laptops have this behavior) will throttle the CPU to the lowest setting if no battery is plugged-in. I don't know what the fine Lenovo engineers have been thinking...

Disable Hyperthreading on the BIOS - you will lose your 2.4 turbo clock but it will not be throttled down to 800Mhz!