Here's the system I am using now

• CPU: Intel Core i5 6500
• Mobo: Gigabyte H110M-A
• Memory: DDR4 2133 Mhz 16 GB
• Primary HDD: Samsung 850 EVO
• GPU: GTX 1650 (Zotac)

A little background on usage and some additional context:

• I don't play games, have no real need for OC unless it speeds up the system. Not a big fan of the idea of OC anyway. Would rather invest on a build that leads a good long life and dies of old age.
• I intend to play 4K videos on the system.
• More cores and threads for multitasking are essential: I have about 40-50 Chrome/Edge tabs open at any point. Multiple MS Excel and Word documents open at the same time. Multiple dev tools open at the same time, working on large datasets. Multiple comm apps open at the same time (Teams, Skype, Slack). Also use Citrix and RDP frequently.
• Watch Netflix 4K, Crave, Youtube in the browser.
• The current system is frequently maxing out on CPU (mainly it's the Edge browser). Moved from Chrome to Edge to save RAM, but now I have a different problem it seems.
• Old guy, big fan of Intel (do not want to switch to AMD).

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Options

(My goal is to spend $1200 CA or less. I have trust in parts sold on and by Amazon.ca, like I said an old guy with die-hard favs):

Plan A: If I can upgrade the CPU or make minor adjustments to the current build that's more preferable. Leaves some room in the budget to buy a QHD 144Hz monitor. I am thinking of upgrading the CPU to i5 9500.

Q: If I upgrade the mobo to GIGABYTE B360 AORUS Gaming 3 WiFi and the RAM to 2666Mhz Corsair, do I have to reinstall Windows 10? Repairing Windows 10 makes you reinstall all your apps, which a huge task for me. Some of the dev tools will take days to config.

Plan B: Rebuild based on this plan. Some of these parts are back-ordered right now.

PCPartPicker Part List: https://ca.pcpartpicker.com/list/6dk2wh

CPU: Intel Core i5-9600K 3.7 GHz 6-Core Processor ($289.99 @ Amazon Canada) CPU Cooler: Cooler Master Hyper 212 RGB Black Edition 57.3 CFM CPU Cooler ($59.99 @ Amazon Canada)

Motherboard: Asus PRIME Z390-A ATX LGA1151 Motherboard ($260.19 @ Amazon Canada) Memory: Corsair Vengeance RGB Pro 32 GB (2 x 16 GB) DDR4-3200 CL16 Memory ($199.99 @ Amazon Canada) Storage: Samsung 970 Evo 1 TB M.2-2280 NVME Solid State Drive ($259.99 @ Amazon Canada) Power Supply: Cooler Master MWE Gold 650 W 80 Gold Certified Fully Modular ATX Power Supply ($136.99 @ Amazon Canada)

Total: $1207.14

Issues with this plan:

1. I have to buy Windows 10. The current one I am using is an Edu version.
2. Go through the process of setup all over again. Transfer data not in the cloud to the new system.
3. Does not leave room in the budget for the monitor upgrade.

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Thank you for reading the long post. Appreciate the guidance in advance.