Socket FS1r2 socket: CPUs, chipsets and cooler fit
Socket FS1r2 is the AMD socketed package for Llano, Trinity and Richland mobile APUs. It is a pin grid array with 722 contacts in a zero insertion force socket. AMD used the FS1 revision for Llano from 2011, then the FS1r2 revision for Trinity from May 2012 and Richland from 2013. It was the last pin grid array socket for AMD mobile processors.
Quick facts
| Maker | AMD |
|---|---|
| Package type | PGA |
| Contacts | 722 |
| Package size | n/a |
| Introduced | May 2012 |
| Status | Legacy |
| Memory | DDR3 and DDR3L, two channels |
| PCIe from the CPU | PCIe 2.0 from the APU (lane layout varies by board design) |
| Cooler mounting holes | Board specific (laptop heatsink) |
| Replaces | Socket S1 |
| Replaced by | FP3 |
Overview
The socket carries Piledriver CPU modules with Radeon HD 8000G series graphics on Richland parts. Power covers 17 W ultra low voltage through 35 W standard voltage, with the board heatsink sized per chassis. Because the chip is socketed, a qualified replacement can be fitted without soldering, subject to BIOS support and physical access.
Later mobile processors moved to soldered BGA packages exclusively, starting with Steamroller on Socket FP3. FS1r2 boards are therefore used or old stock. Memory type, display outputs and power limits follow the laptop design rather than the socket name.
Processor generations
| Codename | Marketing name | Years | Notes |
|---|---|---|---|
| Llano | A-series 3000M and E2 mobile | 2011 to 2012 | K10 mobile APUs with VLIW5 graphics on Socket FS1, the predecessor revision of the same 722-contact socket. |
| Trinity | A-series 4000M and 5000M mobile | 2012 | Piledriver mobile APUs with VLIW4 graphics, launched in May 2012 on Socket FS1r2 for socketed laptops and Socket FP2 for soldered laptops. |
| Richland | A-series 5000M and 6000M mobile refresh | 2013 | Refreshed Piledriver APUs with higher clocks, launched in March to June 2013 on Socket FS1r2, including the A4-5150M, A6-5350M, A8-5550M and A10-5750M. |
Socketed laptop package
FS1r2 uses a 722-contact pin grid array with a zero insertion force lever. The processor carries the pins and drops into the socket, which suits repair and qualified upgrades. This differs from FP2, where the same silicon is soldered with 827 balls and cannot be removed.
In practice replacement depends on access and firmware. Many laptops mount the socket under the keyboard or under a full cooling assembly, so the service manual decides the labor. The board BIOS must list the exact model, since Trinity and Richland share the socket but differ in power and graphics. A like for like swap is the safe case.
Memory and I/O
FS1r2 designs use DDR3 memory in two SODIMM slots, commonly DDR3-1600 on 35 W Richland parts and DDR3L at lower voltage on efficiency tuned boards. Two matched modules help the integrated graphics, since the GPU shares system memory. Capacity limits follow the laptop board, often 16 GB across two slots.
PCIe connectivity is PCIe 2.0 from the APU with a layout that varies by board. Most laptops keep the graphics path internal and devote lanes to SATA storage, wireless and card readers. Discrete graphics are uncommon on these boards. The Socket vs chipset: what decides whether a CPU works guide covers AMD pairing rules.
Platform lifecycle
FS1r2 covers Llano from 2011, Trinity from May 2012 and Richland from 2013. AMD moved mobile to soldered FP3 for Kaveri in June 2014, so no new socketed mobile APUs followed. Compatible laptops and spare chips are used or old stock.
For a working FS1r2 laptop the practical path is maintenance: fresh thermal paste, clean fans, an SSD where the board allows, and a memory pair that matches. A platform move means a new laptop on FP8 or newer. The How to find your CPU socket type guide explains how to confirm the socket before ordering parts.
CPUs on Socket FS1r2
8 processor pages in the database, newest first.
| Processor | Cores / threads | Base / boost | TDP | Launched |
|---|---|---|---|---|
| AMD A10-5750M | 4 / 4 | 2.5 / 3.5 GHz | 35 W | Jun 2013 |
| AMD A6-5350M | 2 / 2 | 2.9 / 3.5 GHz | 35 W | Jun 2013 |
| AMD A8-5550M | 4 / 4 | 2.1 / 3.1 GHz | 35 W | Jun 2013 |
| AMD A4-5150M | 2 / 2 | 2.7 / 3.3 GHz | 35 W | Mar 2013 |
| AMD A10-4600M | 4 / 4 | 2.3 / 3.2 GHz | 35 W | May 2012 |
| AMD A4-4300M | 2 / 2 | 2.5 / 3.0 GHz | 35 W | May 2012 |
| AMD A6-4400M | 2 / 2 | 2.7 / 3.2 GHz | 35 W | May 2012 |
| AMD A8-4500M | 4 / 4 | 1.9 / 2.8 GHz | 35 W | May 2012 |
Frequently asked questions
Which processors fit Socket FS1r2?
Llano, Trinity and Richland mobile APUs in pin grid array form, such as the A4-5150M, A6-5350M, A8-5550M and A10-5750M. Soldered BGA versions of the same silicon use Socket FP2 instead.
Is Socket FS1r2 the same as Socket FP3?
No. FS1r2 is a 722-contact PGA-ZIF for Piledriver mobile. FP3 is a soldered BGA with 906 balls for Steamroller mobile. The packages never interchange.
What memory does Socket FS1r2 use?
DDR3 and low voltage DDR3L in two channels, commonly DDR3-1600 on 35 W Richland parts. Two matched SODIMM modules feed the integrated graphics best. Capacity limits follow the laptop board.
Can an FS1r2 processor be replaced?
Yes, where the laptop design permits access. FS1r2 is a zero insertion force socket, so the chip can be removed. In practice many laptops bury the socket under the keyboard or cooling assembly, and BIOS support still decides which models boot.
Sources and verification
- Socket FS1 on Wikipedia (FS1r2 revision, 722 contacts, PGA-ZIF)
- AMD A6-5350M Specs (TechPowerUp, Socket FS1r2 example)
- AMD A10-5750M Notebook Processor (Notebookcheck, Richland FS1r2 example)
Facts last checked against these sources on . Page last edited on .