Buying Guide
The Best $750 Small Office Compact PC Build
Six parts for a compact office PC, each checked against the others for socket, memory, power and case fit.
By The PC Journal editorial team
12 min read6 products evaluated
A compact office PC is chosen first by the desk space it leaves free, so this build starts from the 21.3-litre Lian Li B4-mATX and a processor that brings its own graphics and its own cooler. Every part is AM4 with DDR4, and the Micro-ATX board and the ATX power supply sit within the limits the case lists.
We chose these six parts from reviewed listings and ran 7 checks across them, among them CPU socket, memory type and memory kit. At the time of writing the full set cost between $700 and $750, and no figure comes from our own testing.
Quick Picks
Our 6 recommendations at a glance. Tap a pick for the full verdict.
Processor
AMD Ryzen 5 5600G
Radeon integrated graphics.
Best for: Buyers assembling a compact office PC who care about Radeon integrated graphics.
Our take Check price for AMD Ryzen 5 5600G (opens in a new tab)
Motherboard
MSI PRO B550M-P
One M.2 Gen4 x4 slot and one M.2 Gen3 x4 slot.
Best for: Buyers assembling a compact office PC who care about one M.2 Gen4 x4 slot and one M.2 Gen3 x4 slot.
Our take Check price for MSI PRO B550M-P (opens in a new tab)
Memory
TEAMGROUP Elite 16GB (2x8GB) DDR4-3200 CL22
1.2V standard-voltage module.
Best for: Buyers assembling a compact office PC who care about 1.2V standard-voltage module.
Our take Check price for TEAMGROUP Elite 16GB (2x8GB) DDR4-3200 CL22 (opens in a new tab)
Storage
Corsair MP600 Core XT 1TB
High-density QLC NAND.
Best for: Buyers assembling a compact office PC who care about high-density QLC NAND.
Our take Check price for Corsair MP600 Core XT 1TB (opens in a new tab)
Power Supply
be quiet! Pure Power 12 650W
Temperature-controlled 120mm be quiet! fan.
Best for: Buyers assembling a compact office PC who care about temperature-controlled 120mm be quiet! fan.
Our take Check price for be quiet! Pure Power 12 650W (opens in a new tab)
Case
Lian Li B4-mATX
Two slim fans.
Best for: Buyers assembling a compact office PC who care about two slim fans.
Our take Check price for Lian Li B4-mATX (opens in a new tab)
| Pick | Why it’s here | Best for | Price |
|---|---|---|---|
| Radeon integrated graphics. | Buyers assembling a compact office PC who care about Radeon integrated graphics. | Check price for AMD Ryzen 5 5600G (opens in a new tab) |
| One M.2 Gen4 x4 slot and one M.2 Gen3 x4 slot. | Buyers assembling a compact office PC who care about one M.2 Gen4 x4 slot and one M.2 Gen3 x4 slot. | Check price for MSI PRO B550M-P (opens in a new tab) |
| 1.2V standard-voltage module. | Buyers assembling a compact office PC who care about 1.2V standard-voltage module. | Check price for TEAMGROUP Elite 16GB (2x8GB) DDR4-3200 CL22 (opens in a new tab) |
| High-density QLC NAND. | Buyers assembling a compact office PC who care about high-density QLC NAND. | Check price for Corsair MP600 Core XT 1TB (opens in a new tab) |
| Temperature-controlled 120mm be quiet! fan. | Buyers assembling a compact office PC who care about temperature-controlled 120mm be quiet! fan. | Check price for be quiet! Pure Power 12 650W (opens in a new tab) |
| Two slim fans. | Buyers assembling a compact office PC who care about two slim fans. | Check price for Lian Li B4-mATX (opens in a new tab) |
Our Picks
Processor1 of 6
AMD Ryzen 5 5600G on Amazon (opens in a new tab)
The Ryzen 5 5600G pairs six Zen 3 cores with Radeon integrated graphics and a boxed cooler.
Best for
- Buyers assembling a compact office PC who care about Radeon integrated graphics.
Skip if
- Skip it if 6 cores leave less headroom for streaming alongside games.
Why we like it
It runs lighter games without a graphics card on cheap AM4 boards and DDR4 memory, and a card can be added later.
The Ryzen 5 5600G brings 6 cores and 12 threads, a 4.4GHz maximum boost, 16MB of L3 cache and a 65W rating, and it accounts for 27% of the parts total. A cooler comes in the box, so the build adds none. Its integrated graphics drive the monitor, so no graphics card is needed.
The Ryzen 5 5600G uses the AM4 socket and the PRO B550M-P board uses AM4, so the processor seats in the board directly. Read the board's CPU support list for the BIOS version this chip needs. The PRO B550M-P takes DDR4 and the Ryzen 5 5600G supports DDR4, so the TEAMGROUP Elite DDR4 kit in DDR4 is the matching type. DDR4 and DDR5 sticks are keyed differently, so the wrong type will not seat. The Ryzen 5 5600G lists integrated graphics, so the monitor plugs into the motherboard's video output and the build needs no graphics card. Check that the board's HDMI or DisplayPort matches your monitor.
Key dimensions & specs
- L3 cache: 16MB
- Max boost: 4.4GHz
- Cores / threads: 6 cores
- Rated power: 65W
- Threads: 12
- Socket: AM4
- Memory: DDR4
- Cooler in box: Yes
- Integrated graphics: Yes
Pros
- 65W rating suits a modest air cooler
- Wraith Stealth cooler in the box
- Integrated graphics for display output without a graphics card
- Radeon integrated graphics
Cons
- 6 cores leave less headroom for streaming alongside games
- AM4 is a final-generation platform with no newer CPUs coming
Motherboard2 of 6
MSI PRO B550M-P on Amazon (opens in a new tab)
What the PRO B550M-P brings to the table is one M.2 Gen4 x4 slot and one M.2 Gen3 x4 slot, plus a PCIe 4.0 x16 slot with Steel Armor.
Best for
- Buyers assembling a compact office PC who care about one M.2 Gen4 x4 slot and one M.2 Gen3 x4 slot.
Skip if
- Skip it if this is a dealbreaker: only 2 M.2 slots.
Why we like it
It also offers a 2 M.2 slot count and offers a 1Gbps wired network speed.
For 10% of the parts total, the PRO B550M-P adds the B550 chipset, Micro-ATX size, 2 M.2 slots and 1GbE LAN on the AM4 socket, and only DDR4 sticks fit its slots.
The Ryzen 5 5600G uses the AM4 socket and the PRO B550M-P board uses AM4, so the processor seats in the board directly. Read the board's CPU support list for the BIOS version this chip needs. The PRO B550M-P takes DDR4 and the Ryzen 5 5600G supports DDR4, so the TEAMGROUP Elite DDR4 kit in DDR4 is the matching type. DDR4 and DDR5 sticks are keyed differently, so the wrong type will not seat. 2 M.2 slots on the PRO B550M-P means the MP600 Core XT 1TB plugs in without an adapter, with a slot spare for later; check the manual for the slot that gets the fastest lanes.
Key dimensions & specs
- M.2 slots: 2
- Wired LAN: 1Gbps
- Form factor: Micro-ATX
- Socket: AM4
- Memory type: DDR4
- Chipset: B550
Pros
- One M.2 Gen4 x4 slot and one M.2 Gen3 x4 slot
- PCIe 4.0 x16 slot with Steel Armor
- Passes 4 compatibility checks that name it in this build
- Takes 10% of the parts total, and every figure it is checked on is stated in its listing
Cons
- Only 2 M.2 slots
- Takes DDR4 only, not DDR5 kits
- No Wi-Fi is listed, so the board relies on wired Ethernet
Memory3 of 6
TEAMGROUP Elite 16GB (2x8GB) DDR4-3200 CL22 on Amazon (opens in a new tab)
What the TEAMGROUP Elite DDR4 brings to the table is a 1.2V standard-voltage module, plus a fallback to 2933 or 2666MT/s on older boards.
Best for
- Buyers assembling a compact office PC who care about 1.2V standard-voltage module.
Skip if
- Skip it if 16GB leaves less headroom than 32GB for heavy browser or creative work.
Why we like it
It also offers a CL22 CAS latency and offers a 3200MT/s rated speed.
This kit is 16GB, DDR4, 3200MT/s and CL22 in two sticks and takes 15% of the parts total.
The PRO B550M-P takes DDR4 and the Ryzen 5 5600G supports DDR4, so the TEAMGROUP Elite DDR4 kit in DDR4 is the matching type. DDR4 and DDR5 sticks are keyed differently, so the wrong type will not seat. 16GB arrives as two sticks in the TEAMGROUP Elite DDR4 kit; the PRO B550M-P manual shows which two slots to fill so the memory runs in dual-channel. If the budget allows more, the SP Turbine offers 32GB at 3200MT/s, roughly 75% dearer than the TEAMGROUP Elite DDR4; it stays on the generation the board and processor take.
Key dimensions & specs
- CAS latency: CL22
- Rated speed: 3200MT/s
- Capacity: 16GB (2 sticks)
- Voltage: 1.2V
- Memory type: DDR4
Pros
- Tight CL22 timings
- 1.2V standard-voltage module
- Fallback to 2933 or 2666MT/s on older boards
Cons
- 16GB leaves less headroom than 32GB for heavy browser or creative work
- At 15% of the parts total, a swap here moves the whole budget
Storage4 of 6
Corsair MP600 Core XT 1TB on Amazon (opens in a new tab)
The MP600 Core XT 1TB is built around high-density QLC NAND.
Best for
- Buyers assembling a compact office PC who care about high-density QLC NAND.
Skip if
- Skip it if the listing does not say whether the drive has a DRAM cache.
Why we like it
On the spec sheet, it is rated for 1TB.
The MP600 Core XT 1TB offers 1TB and PCIe 4.0 and takes 27% of the parts total.
2 M.2 slots on the PRO B550M-P means the MP600 Core XT 1TB plugs in without an adapter, with a slot spare for later; check the manual for the slot that gets the fastest lanes. If the budget allows more, the P310 2TB offers 2TB on PCIe 4.0, roughly 26% dearer than the MP600 Core XT 1TB; the board's M.2 row is unaffected.
Key dimensions & specs
- Interface: PCIe 4.0 x4
- Capacity: 1TB
- Price tier at the time of writing: $100 to $250
Pros
- High-density QLC NAND
- Passes the one compatibility check that names it in this build
- Takes 27% of the parts total, and every figure it is checked on is stated in its listing
Cons
- The listing does not say whether the drive has a DRAM cache
- At 27% of the parts total, a swap here moves the whole budget
Power Supply5 of 6
be quiet! Pure Power 12 650W on Amazon (opens in a new tab)
be quiet!'s Pure Power 12 650W has a native 12V-2x6, two PCIe 8-pin connectors and a single strong 12V rail.
Best for
- Buyers assembling a compact office PC who care about temperature-controlled 120mm be quiet! fan.
Skip if
- Skip it if the listing does not say whether the cables detach.
Why we like it
The be quiet! Pure Power 12 650W is 650W, Gold rated, ATX 3.1, ATX format and one 12V-2x6 connector and takes 11% of the parts total.
The be quiet! Pure Power 12 650W is a standard ATX unit, and the Lian Li B4-mATX listing does not name a power supply type, so confirm ATX fits in its manual. Ranked by cost it comes fourth among the six parts, in the $50 to $100 range, so a change here shifts roughly 11% of the budget.
Key dimensions & specs
- Wattage: 650W
- Native 12V-2x6 cables: 1
- PCIe 8-pin connectors: 2
- 80 Plus rating: Gold
- ATX version: ATX 3.1
- Form factor: ATX
- Fan: 120mm
- Colour: Black
Pros
- A 650W rating
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- Temperature-controlled 120mm be quiet! fan
Cons
- The listing does not say whether the cables detach
- At 11% of the parts total, a swap here moves the whole budget
Case6 of 6
Lian Li B4-mATX on Amazon (opens in a new tab)
The Lian Li B4-mATX is built around two slim fans, with a 21.3L body on top.
Best for
- Buyers assembling a compact office PC who care about two slim fans.
Skip if
- Skip it if the listing gives no CPU cooler height limit, so check the case page.
Why we like it
On the spec sheet, it offers a 358mm GPU clearance and offers a 360mm largest radiator size.
The Lian Li B4-mATX lists room for mATX boards, graphics cards up to 358mm, a radiator up to 360mm and 2 fans in the box and takes 10% of the parts total.
The PRO B550M-P is a Micro-ATX board and the Lian Li B4-mATX lists mATX, so the board mounts on the standoffs without adapters. The be quiet! Pure Power 12 650W is a standard ATX unit, and the Lian Li B4-mATX listing does not name a power supply type, so confirm ATX fits in its manual.
Key dimensions & specs
- Max GPU length: 358mm
- Largest radiator: 360mm
- Volume: 21.3L
- Fans included: 2
- Motherboards: mATX
Pros
- Fits a 360mm radiator
- A compact 21.3L footprint
- Two slim fans
- 21.3L body
Cons
- The listing gives no CPU cooler height limit, so check the case page
- At 10% of the parts total, a swap here moves the whole budget
How We Chose
Each pick was assessed across 4 criteria weighted for real-world use.
- Compatibility rules
- The set was tested on paper against 7 rules (CPU socket, memory type, memory kit, M.2 slot for the SSD, board size in the case, display output without a graphics card and power supply format) and passes all of them.
- Price at the time of writing
- The parts landed between $700 and $750 together, inside the $750 tier. Prices change daily, so the total can drift.
- Maker figures, not testing
- Every figure is a published one, from the listings and the chip makers' power guidance. This guide reports no hands-on build or benchmark.
- Headroom
- The be quiet! Pure Power 12 650W is 650W for a system without a graphics card, well above what its parts draw.
What to Look for in a $750 Small Office Compact PC Build
Key buying criteria so you get the right fit the first time.
Platform and upgrade path
Ryzen 5 5600G and PRO B550M-P use AM4 with DDR4 memory. AM4 is a final-generation socket, so the best chips for it are already on sale and the upgrade path ends there. Among the 16GB kits we reviewed, the typical DDR5 kit cost about 2.3 times the typical DDR4 kit at the time of writing.
Power supply sizing
The be quiet! Pure Power 12 650W is 650W. With integrated graphics and no card, the processor and drives are the only sizeable loads, so the supply has room to spare.
Case fit
The PRO B550M-P is a Micro-ATX board and the Lian Li B4-mATX lists mATX, so the board mounts on the standoffs without adapters.
Cooling
The Ryzen 5 5600G includes a cooler in the box, which is enough at its 65W power; add a tower cooler later only if fan noise bothers you.
Storage
The MP600 Core XT 1TB is PCIe 4.0 x4 and the PRO B550M-P has 2 M.2 slots, so a second drive fits later.
Where the money goes
The three largest lines are processor (27%), storage (27%) and memory (15%).
How to Choose a $750 Small Office Compact PC Build
Compatibility check
We ran 7 checks on these six parts, and the $750 Small Office Compact PC Build passes every one using the figures in the makers' listings. One row asks you to confirm a figure the listing does not give: power supply format.
| Check | Parts | Result |
|---|---|---|
| CPU socket | Ryzen 5 5600G + PRO B550M-P | Both use AM4. |
| Memory type | TEAMGROUP Elite DDR4 + PRO B550M-P + Ryzen 5 5600G | DDR4 on all three. |
| Memory kit | TEAMGROUP Elite DDR4 | 16GB in two sticks. |
| M.2 slot for the SSD | MP600 Core XT 1TB + PRO B550M-P | 2 M.2 slots on the board. |
| Board size in the case | PRO B550M-P + Lian Li B4-mATX | Micro-ATX board; the case lists mATX. |
| Display output without a graphics card | Ryzen 5 5600G | Integrated graphics listed. |
| Power supply format | be quiet! Pure Power 12 650W + Lian Li B4-mATX | Confirm: ATX unit; the case lists no PSU type. |
Scroll sideways to see every column.
The table checks what the listings state. The board's CPU support list and the case manual still have the final word on BIOS and clearance.
Where the budget goes
Together the parts landed between $700 and $750 at the time of writing, inside the $750 tier.
| Part | Pick | Share of parts total | Price tier at the time of writing |
|---|---|---|---|
| Processor | Ryzen 5 5600G | 27% | $100 to $250 |
| Motherboard | PRO B550M-P | 10% | $50 to $100 |
| Memory | TEAMGROUP Elite DDR4 | 15% | $100 to $250 |
| Storage | MP600 Core XT 1TB | 27% | $100 to $250 |
| Power Supply | be quiet! Pure Power 12 650W | 11% | $50 to $100 |
| Case | Lian Li B4-mATX | 10% | $50 to $100 |
Scroll sideways to see every column.
Swap options that stay compatible
We re-ran the compatibility checks for each swap, and each one passes with the other parts unchanged.
| If you want to | Swap in | What changes |
|---|---|---|
| Move to 32GB of memory | SP Turbine | 32GB at 3200MT/s, roughly 75% dearer than the TEAMGROUP Elite DDR4; it stays on the generation the board and processor take |
| Double the storage to 2TB | P310 2TB | 2TB on PCIe 4.0, roughly 26% dearer than the MP600 Core XT 1TB; the board's M.2 row is unaffected |
Scroll sideways to see every column.
Frequently Asked Questions
Is the be quiet! Pure Power 12 650W enough without a graphics card?
Yes, with room to spare: the be quiet! Pure Power 12 650W is 650W and this build draws power mainly through the processor and drives.
Do I need to buy a CPU cooler?
No. The Ryzen 5 5600G includes a cooler in the box, and the build uses it.
Why DDR4 and 16GB of memory?
The PRO B550M-P takes DDR4 and the Ryzen 5 5600G supports DDR4, so the TEAMGROUP Elite DDR4 kit in DDR4 is the matching type. DDR4 and DDR5 sticks are keyed differently, so the wrong type will not seat. Among the 16GB kits we reviewed, the typical DDR5 kit cost about 2.3 times the typical DDR4 kit at the time of writing.
Can I upgrade this build later?
AM4 is a final-generation socket, so the best chips for it are already on sale and the upgrade path ends there. The Lian Li B4-mATX takes up to a 360mm radiator, and the PRO B550M-P has 2 M.2 slots.
What is not included in the total?
The total covers the six listed parts only. An operating system, monitor, keyboard, mouse, tax and shipping are extra, and they vary by buyer.
Bottom Line
Our $750 build centres on integrated graphics, the Ryzen 5 5600G and the Lian Li B4-mATX; it puts the savings into a small case and a 1TB drive, and leaves a graphics card out.
Check the case's listed width, depth and height against your desk; the 21.3L volume figure alone does not say which side is longest.