AMD Ryzen 5 8640U socket: FP8
The AMD Ryzen 5 8640U uses FP8, a soldered BGA for Hawk Point mobile APUs with DDR5 or LPDDR5X and 20 PCIe Gen4 lanes. The 6-core chip at 28 W with Radeon 760M graphics cannot be replaced.
- Socket
- FP8
- Launched
- December 2023
- Cores and threads
- 6 and 12
- Default TDP
- 28 W
- Codename
- Hawk Point
- Segment
- Mobile (soldered)
- Family
- AMD Ryzen 5
- Clocks
- 3.5 / 4.9 GHz
AMD Ryzen 5 8640U specifications
| Cores | 6 |
|---|---|
| Threads | 12 (SMT) |
| Core architecture | Zen 4 |
| Clocks | 3.5 GHz base, up to 4.9 GHz boost |
| Cache | 16 MB L3, 6 MB L2 |
| Default TDP | 28 W (15 to 30 W configurable) |
| Manufacturing process | TSMC 4 nm FinFET |
| Memory support | DDR5-5600 or LPDDR5X-7500, 2 channels, up to 256 GB |
| PCI Express | PCIe 4.0 x20 |
| Integrated graphics | AMD Radeon 760M, 8 CUs at up to 2600 MHz |
| NPU | AMD Ryzen AI, up to 16 TOPS |
| Multiplier | Locked |
| Package | FP8 (BGA, soldered, 25 by 40 mm) |
Motherboard compatibility
AMD Ryzen 5 8640U needs a motherboard with a FP8 socket. Chipset by chipset data for this codename is not recorded yet. See the FP8 chipset list and the board maker's CPU support list.
FP8 at a glance
| Type | BGA, 1,140 contacts |
|---|---|
| Package size | 25 × 40 mm |
| Introduced | 2023 |
| Memory | DDR5 SODIMM or soldered LPDDR5X depending on board design, up to LPDDR5X-8533 on Gorgon Point, dual channel with ECC and Link-ECC options on embedded P100 boards |
| Cooler mounting holes | Not applicable (soldered) |
What the Ryzen 5 8640U is
The Ryzen 5 8640U is a 6-core and 12-thread mobile APU that AMD launched in December 2023 for thin laptops. Six Zen 4 cores with simultaneous multithreading run at 3.5 GHz base and up to 4.9 GHz boost, plus 6 MB of L2 and 16 MB of L3. The 178 sq mm die uses TSMC 4 nm FinFET and carries a 28 W default TDP inside a 15 to 30 W configurable range. It is essentially a rebadged 7640U with a faster Ryzen AI NPU.
Radeon 760M graphics with 8 compute units at up to 2600 MHz drive everyday displays through HDMI, DisplayPort and USB-C alternate mode. A Ryzen AI NPU with up to 16 TOPS accelerates background blur and studio effects while CPU stays free. Shared DDR5-5600 or LPDDR5X-7500 keeps board cost down for the mainstream tier.
Students and office travelers fit here. Six cores keep video calls plus browser tabs smooth at 28 W, while the 4.9 GHz peak shortens app launches. Buyers who need 8 cores for heavier creation should take the AMD Ryzen 7 8840U with Radeon 780M instead, since this 8640U prioritizes battery over thread count.
Socket and motherboard compatibility
The 8640U solders to FP8 with no socket upgrade. Laptop makers cool the 15 to 30 W band with thin fans. There is no later change to chip or soldered RAM, so the order sheet fixes the laptop for life.
Boards use DDR5-5600 SODIMM or soldered LPDDR5X-7500 in two channels up to 256 GB. NVMe over Gen4 plus USB4 covers storage and docks. Firmware from the laptop maker controls power limits between 15 W silent and 28 W performance.
Hawk Point shoppers compare U low-power parts against HS performance twins. The 8640U matches the AMD Ryzen 5 8640HS on clocks at lower power. The LGA, PGA and BGA: CPU package types explained guide explains soldered mobile tradeoffs.
Memory, PCIe and cooling
DDR5-5600 or LPDDR5X-7500 in two channels is the board menu. Shared 760M graphics favor dual-channel population. Soldered 16 GB covers school use, while SODIMM 32 GB helps large projects.
PCIe Gen4 with 20 lanes serves NVMe, wireless and displays. Fixed wiring means second-drive support varies by model. One fast SSD plus Wi-Fi covers student needs.
Cooling is thin-body 28 W with 15 W silent modes. No retail cooler ships with soldered mobile. Vent clearance preserves the 4.9 GHz burst feel.
Upgrade paths
No processor upgrade exists on soldered boards. The Hawk Point choice is 6-core versus 8-core at order time. SODIMM RAM and NVMe can grow where fitted.
Beyond Hawk Point the move is a whole laptop on Strix Point with newer NPU. A working 8640U lasts school years with drive care.
Frequently asked questions
What socket does the Ryzen 5 8640U use?
It uses FP8, soldered with DDR5 or LPDDR5X. The chip cannot be replaced.
How fast is the Ryzen 5 8640U?
Six cores and 12 threads at 3.5 GHz base and up to 4.9 GHz boost, with 16 MB of L3 at 28 W.
What graphics does the 8640U include?
Radeon 760M with 8 compute units at up to 2600 MHz for office and study displays.
Can the Ryzen 5 8640U be upgraded?
No. CPU solders at the factory. SODIMM RAM and NVMe can change where fitted.
Sources and verification
- AMD Ryzen 7 PRO 8840U Hawk Point 8 cores 28W specs pattern (AMD)
- Ryzen 5 8640U vs Ryzen 7 8840U Hawk Point specs 4.9GHz 5.1GHz (Technical City)
Facts last checked against these sources on . Page last edited on .