Nette Memory usage Class vs ActiveRow

<?php

namespace App\Model\Managers;

use Nette\Database\Context;

class Manager{

    use \Nette\SmartObject;

    /**
     * @var Context
     */
    public $db;

    public function __construct(Context $db) {
        $this->db = $db;
    }


    public function loadUsers() {
        $startMemory = memory_get_usage();

        // TEST 1
        /////////////////////////////////////////////////////////////////////////////////////////////////

        $users = $this->db->table('user')->fetchAll();

        bdump((memory_get_usage(false) - $startMemory), 'Test 1');

        // TEST 2
        /////////////////////////////////////////////////////////////////////////////////////////////////
        $resultArray = [];

        foreach ($users as $user) {
            $resultArray[] = new Man($user->name, $user->surname, $user->email);
        }

        unset($users);

        bdump((memory_get_usage(false) - $startMemory), 'Test 2');

        unset($resultArray);
    }
}

class Man {
    public $name;
    public $surname;
    public $email;

    public function __construct($name, $surname, $email) {
        $this->name = $name;
        $this->surname = $surname;
        $this->email = $email;
    }
}