AMD Phenom X4 9550 socket: Socket AM2+
The AMD Phenom X4 9550 uses the Socket AM2+ socket. It is a 95 W quad-core Agena part at 2.2 GHz with 4x512 KB of L2 plus 2 MB of shared L3, the B3 replacement for the 9500.
- Socket
- Socket AM2+
- Launched
- March 2008
- Cores and threads
- 4 and 4
- Default TDP
- 95 W
- Codename
- Agena
- Segment
- Desktop
- Family
- AMD Phenom X4
- Clocks
- 2.2 GHz
AMD Phenom X4 9550 specifications
| Cores | 4 |
|---|---|
| Threads | 4 |
| Core architecture | Agena cores on 65 nm |
| Clocks | 2.2 GHz (no turbo) |
| Cache | 4x512 KB L2 plus 2 MB shared L3 |
| Default TDP | 95 W |
| Manufacturing process | 65 nm |
| Memory support | DDR2-800 and DDR2-1066, two channels |
| HyperTransport | 1.8 GHz |
| PCI Express | PCIe from the board chipset |
| Integrated graphics | None (board video where fitted) |
| Multiplier | Locked |
| Package | Socket AM2+ (940 pins) |
| Core voltage | 1.15 to 1.25 V |
Motherboard and chipset compatibility
AMD Phenom X4 9550 needs a motherboard with a Socket AM2+ socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| 700 series | 790FX, 790X, 770 | Works out of the box |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for Socket AM2+.
Socket AM2+ at a glance
| Type | PGA, 940 contacts |
|---|---|
| Package size | 40 × 40 mm |
| Introduced | November 2007 |
| Memory | DDR2 up to PC2-8500 (DDR2-1066), two channels |
| Cooler mounting holes | 48 × 96 mm |
What the Phenom X4 9550 is
The AMD Phenom X4 9550 is a 2.2 GHz quad core from March 27, 2008. It runs four K10 cores at 2.2 GHz with no turbo, so 4 cores give 4 threads. Cache is 512 KB of L2 per core under a shared 2 MB L3 on a 65 nm process. Power is rated at 95 W on Socket AM2+.
The 9550 is built on the fixed B3 stepping at 1.15 to 1.25 V, part HD9550WCJ4BGH, with no TLB erratum, and its HyperTransport link runs at 1.8 GHz. It exists because AMD replaced the B2 9500 with a B3 part at the same rating, keeping price and power while fixing the bug.
Socket and motherboard compatibility
The 9550 needs a Socket AM2+ board with DDR2 memory and a BIOS that recognizes B3 Agena parts. Most AM2+ boards support it after a BIOS refresh. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.
Memory, PCIe and cooling
Memory is DDR2-800 and DDR2-1066 in two channels.
HyperTransport 3.0 at 1.8 GHz links the CPU to the chipset. PCIe slots hang off the chipset.
Cooling should be rated for 95 W on the 48 x 96 mm mount, with Cool'n'Quiet trimming clocks and voltage at idle.
Upgrade paths
On Socket AM2+ the upgrade is the AMD Phenom X4 9650 at 2.3 GHz or the AMD Phenom X4 9750 (95W) at 2.4 GHz on the same fixed stepping. The AMD Phenom X4 9350e at 2.0 GHz drops to 65 W for quieter running.
Frequently asked questions
What socket does the Phenom X4 9550 use?
Socket AM2+, the 940-pin package on DDR2 boards with HyperTransport 3.0.
How many cores does the Phenom X4 9550 have?
Four cores and 4 threads at 2.2 GHz with 512 KB of L2 per core plus 2 MB of shared L3.
What memory works with the Phenom X4 9550?
DDR2-800 and DDR2-1066 in two channels.
Sources and verification
Facts last checked against these sources on . Page last edited on .