Question How cheapest a DDR5 and an HDMI 2.1 PC can be built right now?

Cheapest? $530 bucks.

Like so:

PCPartPicker Part List

CPU: Intel Celeron G6900 3.4 GHz Dual-Core Processor ($79.00 @ B&H)
Motherboard: MSI PRO Z690-A WIFI ATX LGA1700 Motherboard ($145.99 @ B&H)
Memory: Crucial CT8G48C40U5 8 GB (1 x 8 GB) DDR5-4800 CL40 Memory ($24.99 @ Amazon)
Storage: Leven JS600 128 GB 2.5" Solid State Drive ($13.99 @ Amazon)
Video Card: MSI VENTUS 2X OC GeForce RTX 3050 6GB 6 GB Video Card ($169.99 @ Newegg)
Case: GameMax Nova N5 ATX Mid Tower Case ($40.98 @ Newegg)
Power Supply: Corsair CX (2023) 550 W 80+ Bronze Certified ATX Power Supply ($54.99 @ Amazon)
Total: $529.93

Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2024-04-09 01:37 EDT-0400


Does have DDR5, wi-fi 6 (built-in to MoBo), USB type-C (back of the MoBo) and HDMI 2.1 (on the GPU), but doesn't have bluetooth. Then again, bluetooth is optional.
Essentially every component is the cheapest currently available, except PSU. PSU is a bit better than bottom of the barrel and would do fine for this low-power office build.

Edit: If you remove wi-fi option, then it comes down to ~$300 bucks,
pcpp: https://pcpartpicker.com/list/MmXVQP

Cheaper MoBo that has HDMI 2.1, thus, GPU isn't needed. And CPU has iGPU in it.
 
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Absolute cheapest is not a good idea. It needs to be actually usable too.

PCPartPicker Part List

CPU: Intel Core i3-12100 3.3 GHz Quad-Core Processor ($121.98 @ Amazon)
Motherboard: Gigabyte B760M DS3H AX Micro ATX LGA1700 Motherboard ($139.99 @ Newegg)
Memory: TEAMGROUP Elite 16 GB (2 x 8 GB) DDR5-4800 CL40 Memory ($49.99 @ Amazon)
Storage: TEAMGROUP T-Force Vulcan Z 512 GB 2.5" Solid State Drive ($30.99 @ Amazon)
Case: DIYPC MA08 MicroATX Mini Tower Case ($39.97 @ Newegg)
Power Supply: Corsair CX (2023) 550 W 80+ Bronze Certified ATX Power Supply ($54.99 @ Amazon)
Total: $437.91
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2024-04-10 08:30 EDT-0400
 
16gb is the minimum I would go. The build above had a single 8gb stick, which I would call insufficient.
6 years ago when Office 365 launched, 8 GB of RAM was the norm for PC builds. Software hasn't changed, Office 365 still needs min 4 GB of RAM (or 2 GB when OS is 32-bit), so, 8 GB will suffice.

Also, OP asked the cheapest within given parameters and that's what i did. Also, for office build, Celeron chip will do. After all, this is the target usage of Celeron chips.
Moreover, door is open for further component upgrades once OP has more funds. But when current funds can't do low-end build, then entry-level (cheapest) build has to do it.
 
6 years ago when Office 365 launched, 8 GB of RAM was the norm for PC builds. Software hasn't changed, Office 365 still needs min 4 GB of RAM (or 2 GB when OS is 32-bit), so, 8 GB will suffice.

Also, OP asked the cheapest within given parameters and that's what i did. Also, for office build, Celeron chip will do. After all, this is the target usage of Celeron chips.
Moreover, door is open for further component upgrades once OP has more funds. But when current funds can't do low-end build, then entry-level (cheapest) build has to do it.

But Windows has changed, and become more and more bloated.