# Dell Latitude 7490

# Батарея

i7-8650U, 16 Gb Ram, 512 NVMe SSD. ArchLinux, Gnome 42.2, google-chrome, wayland.

<table border="1" id="bkmrk-%D0%9D%D0%B0%D0%B3%D1%80%D1%83%D0%B7%D0%BA%D0%B0-%D0%A1%D0%BE%D1%81%D1%82%D0%BE%D1%8F%D0%BD%D0%B8%D0%B5-%D0%9F" style="border-collapse: collapse; width: 100%; height: 89.3907px;"><tbody><tr style="height: 29.7969px;"><td style="width: 23.9802%; height: 29.7969px;">Нагрузка</td><td style="width: 28.4302%; height: 29.7969px;">Состояние</td><td style="width: 12.9784%; height: 29.7969px;">Потребление</td><td style="width: 34.4876%;">  
</td></tr><tr style="height: 29.7969px;"><td style="width: 23.9802%; height: 29.7969px;">Минимальная</td><td style="width: 28.4302%; height: 29.7969px;">No WiFi, No BT, 0% LCD, 0% KBD</td><td style="width: 12.9784%; height: 29.7969px;">~4.1 W</td><td style="width: 34.4876%;">  
</td></tr><tr style="height: 29.7969px;"><td style="width: 23.9802%; height: 29.7969px;">Простой</td><td style="width: 28.4302%; height: 29.7969px;">Wifi, BT, 25% LCD, 100% KBD</td><td style="width: 12.9784%; height: 29.7969px;">~ 6 W</td><td style="width: 34.4876%;">  
</td></tr><tr><td style="width: 23.9802%;">100% Нагрузка (stress -c 8)</td><td style="width: 28.4302%;">WiFi, BT, 10% LCD, 0% KBD</td><td style="width: 12.9784%;">~ 31 W (peak 50W)</td><td style="width: 34.4876%;">Под полной нагрузкой (100% экран, 100% клавиатура) вырубился, боюсь его так сильно нагружать. В пике греетсяд о 100 градусов, однако при запуске кулера быстро охлаждается</td></tr><tr><td style="width: 23.9802%;">Браузинг, скроллинг</td><td style="width: 28.4302%;">WiFi, No BT, 50% LCD, 100% KBD</td><td style="width: 12.9784%;">~ 10 W</td><td style="width: 34.4876%;">  
</td></tr><tr><td style="width: 23.9802%;">Браузинг, Youtube 1080p, VP9</td><td style="width: 28.4302%;">WiFi, No BT, 50% LCD, 100% KBD</td><td style="width: 12.9784%;">~ 9.5 W</td><td style="width: 34.4876%;">Не вижу смысла смотреть разрешения ниже</td></tr><tr><td style="width: 23.9802%;">Браузинг, Youtube 1080p, VP9</td><td style="width: 28.4302%;">WiFi, No BT, 10% LCD, 100% KBD</td><td style="width: 12.9784%;">~ 8.3 W</td><td style="width: 34.4876%;">Минимальная комфортная яркость</td></tr></tbody></table>

У этой модели фиговый аккум. Быстро изнашивается и разбалансируется. Однако поддельные аккумуляторы под него не делают, поэтому если ты нашел какой-то аккум на озоне, то он 100% оригинальный.

# Производительность (синтетика)

<p class="callout danger">Ноутбук очень горячий, с плохой термопастой может греться до 100 градусов под нагрузкой, идеальным термоинтерфейсом будет термопаста с фазовым переходом</p>

CPU: i7 8650U, iGPU, NVMe SSD Silicon Power

GeekBench: [https://browser.geekbench.com/v5/cpu/16321424](https://browser.geekbench.com/v5/cpu/16321424)

GeekBench (linux-clear): [https://browser.geekbench.com/v5/cpu/16322358](https://browser.geekbench.com/v5/cpu/16322358)

UPD: GeekBench спустя год стал выдав

<table border="1" id="bkmrk-sysbench-cpu-events-" style="border-collapse: collapse; width: 100%;"><tbody><tr><td style="width: 49.9383%;">sysbench cpu</td><td style="width: 49.9383%;">events per second: 1364.00</td></tr><tr><td style="width: 49.9383%;">sysbench threads</td><td style="width: 49.9383%;">General statistics:  
 total time: 10.0000s  
 total number of events: 22599  
</td></tr><tr><td style="width: 49.9383%;">glxgears</td><td style="width: 49.9383%;">~ 9800 FPS</td></tr><tr><td style="width: 49.9383%;">GeekBench Single-Core Score</td><td style="width: 49.9383%;">1096</td></tr><tr><td style="width: 49.9383%;">GeekBench Multi-Core Score  
</td><td style="width: 49.9383%;">4080</td></tr><tr><td style="width: 49.9383%;">GeekBench Single-Core Score (linux-clear)</td><td style="width: 49.9383%;">1195</td></tr><tr><td style="width: 49.9383%;">GeekBench Multi-Core Score (linux-clear)</td><td style="width: 49.9383%;">4185</td></tr></tbody></table>

```shell
losted in ~ λ sysbench cpu run
sysbench 1.0.20 (using system LuaJIT 2.0.5)

Running the test with following options:
Number of threads: 1
Initializing random number generator from current time


Prime numbers limit: 10000

Initializing worker threads...

Threads started!

CPU speed:
    events per second:  1364.00

General statistics:
    total time:                          10.0003s
    total number of events:              13642

Latency (ms):
         min:                                    0.68
         avg:                                    0.73
         max:                                    5.44
         95th percentile:                        0.73
         sum:                                 9998.08

Threads fairness:
    events (avg/stddev):           13642.0000/0.00
    execution time (avg/stddev):   9.9981/0.00

losted in ~ λ sysbench threads run
sysbench 1.0.20 (using system LuaJIT 2.0.5)

Running the test with following options:
Number of threads: 1
Initializing random number generator from current time


Initializing worker threads...

Threads started!


General statistics:
    total time:                          10.0000s
    total number of events:              22599

Latency (ms):
         min:                                    0.43
         avg:                                    0.44
         max:                                    6.88
         95th percentile:                        0.44
         sum:                                 9996.25

Threads fairness:
    events (avg/stddev):           22599.0000/0.00
    execution time (avg/stddev):   9.9963/0.00

```

# Энергосбережение

---

```
echo 30 | sudo tee /sys/devices/system/cpu/cpufreq/conservative/down_threshold
echo 1 | sudo tee /sys/devices/system/cpu/cpufreq/conservative/freq_step 
echo 2 | sudo tee /sys/devices/system/cpu/cpufreq/conservative/sampling_down_factor 
echo 80 | sudo tee /sys/devices/system/cpu/cpufreq/conservative/up_threshold 
echo 15000 | sudo tee /sys/devices/system/cpu/cpufreq/conservative/sampling_rate 

echo 10000000 | sudo tee /sys/class/powercap/intel-rapl:0/constraint_0_power_limit_uw
echo 12000000 | sudo tee /sys/class/powercap/intel-rapl:0/constraint_1_power_limit_uw


undervolt 0 'CPU' -85
undervolt 1 'GPU' 0
undervolt 2 'CPU Cache' -45
undervolt 3 'System Agent' 0
undervolt 4 'Analog I/O' 0

```