AMD Ryzen 7 7840U socket: FP8
The AMD Ryzen 7 7840U uses FP8, a soldered BGA for Phoenix mobile APUs with DDR5 or LPDDR5X and 20 PCIe Gen4 lanes. The 8-core chip at 28 W with Radeon 780M graphics cannot be replaced.
- Socket
- FP8
- Launched
- May 2023
- Cores and threads
- 8 and 16
- Default TDP
- 28 W
- Codename
- Phoenix
- Segment
- Mobile (soldered)
- Family
- AMD Ryzen 7
- Clocks
- 3.3 / 5.1 GHz
AMD Ryzen 7 7840U specifications
| Cores | 8 |
|---|---|
| Threads | 16 (SMT) |
| Core architecture | Zen 4 |
| Clocks | 3.3 GHz base, up to 5.1 GHz boost |
| Cache | 16 MB L3, 8 MB L2 |
| Default TDP | 28 W (15 to 30 W configurable) |
| Manufacturing process | TSMC 4 nm (25 billion transistors) |
| Memory support | DDR5-5600 or LPDDR5X-7500, 2 channels, 89.6 GB/s |
| PCI Express | PCIe Gen4 x20 |
| Integrated graphics | AMD Radeon 780M |
| NPU | AMD Ryzen AI, 10 TOPS |
| Multiplier | Locked |
| ECC memory | Yes (where board enables it) |
| Package | FP8 (BGA, soldered) |
Motherboard compatibility
AMD Ryzen 7 7840U 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 7 7840U is
The Ryzen 7 7840U is an 8-core and 16-thread mobile APU that AMD launched in May 2023 for premium thin laptops. Eight Zen 4 cores with simultaneous multithreading run at 3.3 GHz base and up to 5.1 GHz boost, plus 8 MB of L2 and 16 MB of L3. The 178 sq mm die uses TSMC 4 nm with 25 billion transistors and carries a 28 W default TDP inside a 15 to 30 W configurable range. Part numbers span FP8, FP7 and FP7r2 for board variants.
Radeon 780M graphics handle premium thin creation displays. ECC memory support helps mission-critical mobile designs where the board enables it. Shared DDR5-5600 or LPDDR5X-7500 with 89.6 GB per s of bandwidth feeds 8 cores from a soldered or SODIMM pool.
Premium thin buyers fit here. Eight cores at 28 W keep creation plus calls smooth with long battery. Shoppers who need 45 W sustained base should take HS parts such as the AMD Ryzen 7 7840HS with 3.8 GHz base instead, since this U part prioritizes efficiency.
Socket and motherboard compatibility
The 7840U solders to FP8 with 15 to 30 W cooling. No socket upgrade exists. Firmware caps power for thin bodies.
Boards use DDR5 SODIMM or soldered LPDDR5X in two channels. NVMe plus USB-C covers storage and docks. Vendor profiles decide silent versus balanced behavior.
Thin shoppers compare the 8-core U against HS at equal turbo. The 7840U matches 5.1 GHz bursts at lower base. The LGA, PGA and BGA: CPU package types explained guide explains soldered thin design.
Memory, PCIe and cooling
DDR5-5600 or LPDDR5X-7500 in two channels is the menu, with ECC on capable boards. Shared graphics favor dual modules. Soldered size is fixed where fitted.
PCIe Gen4 x20 serves storage, wireless and displays. Options vary by thin model.
Cooling is premium thin 28 W with quiet curves. No retail cooler ships with soldered parts.
Upgrade paths
No CPU upgrade exists. The U decision is made at order time. RAM and NVMe can grow where fitted.
The next platform is Hawk Point U with stronger NPU. A working 7840U lasts premium thin years.
Frequently asked questions
What socket does the Ryzen 7 7840U use?
It uses FP8, soldered with DDR5 or LPDDR5X. The chip cannot be replaced.
How fast is the Ryzen 7 7840U?
Eight cores and 16 threads at 3.3 GHz base and up to 5.1 GHz boost, with 16 MB of L3 at 28 W.
What graphics does the 7840U include?
Radeon 780M for premium thin creation displays.
Can the Ryzen 7 7840U be upgraded?
No. CPU solders at the factory. RAM and storage can change where allowed.
Sources and verification
- AMD Ryzen 7 7840U Phoenix 8 cores 5.1GHz FP8 specs (TechPowerUp)
- AMD Ryzen 7 7840U Phoenix 8 cores benchmarks FP8 (CPUBoss)
Facts last checked against these sources on . Page last edited on .