Upgraded hardware for cad training

[dirtdiver069]

I am wanting to start cad training & am using a dell 7558, here are the specs & i needed to know what upgrades I need or do I need to just get a different laptop. I am trying to upgrade assuming it's cheaper. Please help if you can.
Windows 10

Intel Core i7-5500U (2.4 GHz with Turbo Boost up to 3.0 GHz, 4 MB L3 cache)

Display 15.6-inch
Full HD (1920 x 1080 pixels)
LED-Backlit, touchscreen

Graphics Card
Pentium: Intel HD Graphics
Core: Intel HD Graphics 5500

Storage
5400 RPM HDD (from 500 GB up to 1 TB)

System Memory
4 GB or 8 GB DDR3L 1600 MHz

Optical Drive
External DVD RW tray-load (optional)

Audio
Dual speakers with Waves MaxxAudio Pro

Inputs & Controls
Spill-resistant, backlit keyboard with full-size keys
Multi-touch precision touchpad

Input/Output Ports
1 x combo microphone / headphone jack
1 x HDMI 1.4a
1 x USB 3.0 with PowerShare
1 x USB 3.0
1 x USB 2.0

Slots
Media Card (SD, MMC)

Connectivity
Intel Centrino Wireless AC 7265 (802.11ac)
Bluetooth 4.0

 

[rgd1101]

different laptop, you probably want a quad cores cpu. there are some nice mobile workstation.
If you don't have a budget for a new laptop. then a SSD and max out the ram.

 

[ffg7]

max your ram to 8gig if still using that laptop.
http://www.crucial.com/usa/en/compatible-upgrade-for/Dell/inspiron-15-%287558%29
http://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_inspiron_laptop/inspiron-15-7558-laptop_reference%20guide_en-us.pdf