AMD Ryzen 5 PRO 5645 socket: AM4
The AMD Ryzen 5 PRO 5645 uses AM4, the PGA socket for Ryzen desktop processors. The 6-core chip at 65 W needs a desktop board with DDR4 memory and a graphics card.
- Socket
- AM4
- Launched
- 2022
- Cores and threads
- 6 and 12
- Default TDP
- 65 W
- Codename
- Vermeer
- Segment
- Desktop
- Family
- AMD Ryzen 5
- Clocks
- 3.7 / 4.6 GHz
AMD Ryzen 5 PRO 5645 specifications
| Cores | 6 |
|---|---|
| Threads | 12 |
| Core architecture | Zen 3 (Vermeer) |
| Clocks | 3.7 GHz base, up to 4.6 GHz boost |
| Cache | 32 MB L3 and 3 MB L2 |
| Default TDP | 65 W |
| Manufacturing process | TSMC 7 nm FinFET |
| Memory support | DDR4 up to 3200 MT/s, two channels |
| PCI Express | PCIe 4.0 |
| Integrated graphics | None. A graphics card is required |
| ECC memory | Yes |
| Package | AM4 (PGA1331) |
| Cooler in the box | None (OEM tray, cooler supplied with system) |
Motherboard and chipset compatibility
AMD Ryzen 5 PRO 5645 needs a motherboard with a AM4 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| 500 series | X570, B550, A520 | Works out of the box Boards sold before Ryzen 5000 launched in late 2020 may need a BIOS update first. |
| 400 series | X470, B450 | Needs a BIOS update Needs a BIOS update with AMD's Ryzen 5000 support. The board maker's CPU support list is the deciding source. |
| 300 series | X370, B350, A320 | Needs a BIOS update AMD allowed Ryzen 5000 on 300 series boards from 2022, but each board maker decides whether to release the BIOS, and not every board received it. |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for AM4.
AM4 at a glance
| Type | PGA, 1,331 contacts |
|---|---|
| Package size | 40 × 40 mm |
| Introduced | 2016 |
| Memory | DDR4 only |
| Cooler mounting holes | 54 × 90 mm |
What the Ryzen 5 PRO 5645 is
AMD positions the Ryzen 5 PRO 5645 as the 6-core PRO member of the Ryzen 5000 desktop family for AM4 boards from 2022. Some tables print the name as Ryzen 7 PRO 5645, but AMDs product page names the 6-core Vermeer PRO part Ryzen 5 PRO 5645, which is the name used here. 6 cores with simultaneous multithreading give 6 cores and 12 threads, with base at 3.7 GHz and up to 4.6 GHz boost. The package carries 32 MB of L3 plus 3 MB of L2. The 65 W envelope fits standard desktop cooling with a graphics card, since this PRO chip carries no integrated graphics.
Performance lands near the consumer Vermeer counterpart at the same core count, with clocks set for office fleets rather than tuning. Memory stays with DDR4, so existing AM4 boards carry the part after a BIOS update. AMD sells the part through business channels with PRO manageability and security features.
Business fleets take this 6-core PRO part with manageability features for managed desktops, where per core speed stays high at 65 W. The Socket vs chipset: what decides whether a CPU works guide covers AM4 board choice, and AMD Ryzen 7 PRO 5845 shows a nearby PRO option on the same socket.
Socket and motherboard compatibility
The 5645 fits AM4 on desktop boards with AM4 retention and desktop power delivery. Vermeer works natively on 500 series chipsets and after a BIOS update on 400 and 300 series boards that list Vermeer PRO support. Board lists must name the PRO part, since business BIOS revisions lag consumer releases.
Chipset choice decides USB, SATA and slot breadth rather than CPU fit. A 500 series board is the natural match for a new build, while a 400 series board needs a confirmed BIOS revision before the swap. Check the board CPU list for the exact PRO model before buying.
Memory, PCIe and cooling
DDR4 up to 3200 MT/s, two channels feed the cores for office workloads, and matched DIMMs hold the rated speed. Capacity follows the board with four DIMM slots on most ATX designs, and two matched kits fill the board for full population. Population in matched pairs keeps dual channel operation at the rated speed.
PCIe 4.0 from the CPU wires a graphics card and NVMe storage, which matters more here than on APUs because every display needs the discrete card. Lane splits follow board firmware, so slot population rules come from the board manual.
Cooling is a 65 W desktop heatsink with standard AM4 mounting. Tray parts ship without a cooler, so the system or a retail AM4 cooler covers the load with headroom for boost.
Upgrade paths
On AM4 the upward moves are higher core parts where thread counts grow, up to 12 and 16-core Vermeer chips on boards with the power delivery for them. For this 6-core PRO SKU, memory growth and a faster graphics card often help more than clocks. Boards with spare DIMM slots take the upgrade without touching the CPU, and storage moves to NVMe where the board offers the slot.
Outside this SKU, AMD Ryzen 7 PRO 5845 (Ryzen 7 PRO 5845) on AM4 adds cores for denser work. Display count follows the graphics card outputs, since every port hangs off the discrete card. A move to AM5 needs a new board with DDR5, so socket local growth comes first.
Frequently asked questions
What socket does the Ryzen 5 PRO 5645 use?
AM4 on desktop boards with the PRO part on the CPU support list.
Does the Ryzen 5 PRO 5645 have integrated graphics?
No, a graphics card is required for any display.
Is there a Ryzen 7 PRO 5645?
No, the 6-core Vermeer PRO part is the Ryzen 5 PRO 5645 on AMDs product page.
What does PRO add over the consumer version?
PRO manageability with remote management, PRO Security and a business support channel for fleets, as AMD defines the PRO feature set, which keeps fleet images on one baseline.
Is the Ryzen 5 PRO 5645 sold at retail?
No, it ships through business channels, so tray pulls carry no boxed cooler. System builders add their own AM4 cooler rated for the TDP.
Sources and verification
- AMD AMD Ryzen 5 PRO 5645 specifications (AMD)
- AMD Readies a Handful New Ryzen PRO 5000 Desktop Processor SKUs (TechPowerUp news)
Facts last checked against these sources on . Page last edited on .