Socket FM1

Socket FM1 is a socket for mid-class and budget AMD desktop microprocessors, built on 32nm technology. The socket was introduced in July 2011, and initially supported A6- and A8-series quad-core CPUs. Over the course of the next few months, AMD also released A4- and Athlon II X4 socket FM1 microprocessors. Several additional families for the socket, such as E2-Series, Athlon II X2 and Sempron X2, are expected to launch in the fourth quarter 2011 and in 2012. Currently (September 2011), the socket FM1 works with dual, triple and quad-core desktop processors with frequencies up to 3000 MHz. The socket supports dual-channel DDR3 memory up to DDR3-1866, and, optionally, integrated graphics processing unit.

The socket FM1 has 905 pin holes. The pin holes are arranged as 31 x 31 grid, with 13 pin holes plugged at the corners of the grid, 7 x 5 section removed from the center of grid, and additional 8 pin holes plugged close to the center.

Supported processors

All microprocessors, listed in the table below, physically fit into the socket, but not all of them may be supported. If you're upgrading a computer system, please make sure that the new CPU is compatible with your motherboard. To determine what microprocessors are supported by your motherboard please see "Upgrading socket FM1 motherboards" section below.

Model	Box part numbers	Technology (micron)	Core stepping	Cores	Frequency (MHz)	Turbo freq. (MHz)	L2 cache (KB)	TDP (Watt)
A4-3300	AD3300OJGXBOX	0.032	B0	2	2500		1024	65
A4-3300	AD3300OJHXBOX	0.032	B0	2	2500		1024	65
A4-3400	AD3400OJGXBOX	0.032	B0	2	2700		1024	65
A4-3400	AD3400OJHXBOX	0.032	B0	2	2700		1024	65
A4-3420		0.032	B0	2	2800		1024	65
A6-3600	AD3600OJGXBOX	0.032	LN1-B0	4	2100	2400	4096	65
A6-3500	AD3500OJGXBOX	0.032	LN1-B0	3	2100	2400	3072	65
A6-3620	AD3620OJGXBOX	0.032	B0	4	2200	2500	4096	65
A6-3650	AD3650WNGXBOX	0.032	LN1-B0	4	2600		4096	100
A6-3670K	AD3670WNGXBOX	0.032	LN1-B0	4	2700		4096	100
A8-3800	AD3800OJGXBOX	0.032	LN1-B0	4	2400	2700	4096	65
A8-3820	AD3820OJGXBOX	0.032	B0	4	2500	2800	4096	65
A8-3850	AD3850WNGXBOX	0.032	LN1-B0	4	2900		4096	100
A8-3870K	AD3870WNGXBOX	0.032	LN1-B0	4	3000		4096	100
Athlon II X2 221	AD221XOJGXBOX	0.032	B0	2	2800		1024	65
Athlon II X4 631	AD631XWNGXBOX	0.032	B0	4	2600		4096	100
Athlon II X4 631	AD631XOJGXBOX	0.032	B0	4	2600		4096	65
Athlon II X4 638	AD638XOJGXBOX	0.032	B0	4	2700		4096	65
Athlon II X4 641	AD641XWNGXBOX	0.032	B0	4	2800		4096	100
Athlon II X4 651	AD651XWNGXBOX	0.032	B0	4	3000		4096	100
Athlon II X4 651K	AD651KWNGXBOX	0.032	B0	4	3000		4096	100
E2-Series E2-3200	ED3200OJGXBOX	0.032	B0	2	2400		1024	65
Sempron X2 198	SD198XOJGXBOX	0.032	B0	2	2500		1024	65

There are no processors from other manufacturers, compatible with this socket.

Compatible sockets

None

Compatible package types

905-pin lidded micro-PGA package

Upgrading socket FM1 motherboards

To find out what processors are supported by your system you will need to:

• For brand name computers like Dell and HP: determine model of your computer, and search for it on manufacturer's website. Although computer manufacturers may not publish CPU upgrade information for their PCs, sometimes you may find upgrade recommendations in customer support forums.
• For generic computers, or if you failed to find anything on computer manufacturer website: determine make and model of the motherboard in your computer, and search for them on the motherboard manufacturer's website. For upgrade information for ABIT, ASRock, ASUS, DFI, ECS, Gigabyte Technology, Jetway, MSI, PC Chips motherboards please check CPU-Upgrade motherboard database.
• If you can't find CPU support data for you computer and motherboard, then use CPU-Z or similar program to determine chipset type in your PC, and look for CPU upgrade information for the chipset. CPU support data for Intel chipsets can be found on CPU-Upgrade.com in Intel chipsets section, or on Intel website. This method is less reliable than the first two.

Once you located a list of supported microprocessors for your computer, you can choose the best one based on your needs:

• A8-Series chips have the best overall CPU and 3D graphics performance.
• A6-Series microprocessors have decent CPU and 3D graphics performance at cheaper price point.
• E2- and A4-Series processors are good for basic office-type applications, e-mail, browsing, and occasional games. Their main advantage is very low price.
• Athlon II X4 socket FM1 chips offer very good multi-threading performance, but they don't have integrated graphics unit. CPUs from this family can be recommended only if you already have a video card, or can buy one for cheap.