AMD Opteron X2 185 socket: Socket 939

What the Opteron X2 185 is

The AMD Opteron X2 185 is a 2.6 GHz dual-core server processor from March 2006. It runs two K8 cores at 2.6 GHz with no turbo, so 2 cores give 2 threads. Cache is 1 MB of L2 per core on a 90 nm process. Power is rated at 110 W on Socket 939.

The 185 served single-processor Denmark servers on a 1000 MT/s HyperTransport link. It exists because workstation buyers wanted Opteron validation with unbuffered DDR memory at 2.6 GHz without moving to registered Socket 940.

Socket and motherboard compatibility

The X2 185 fits Socket 939 single-processor server and workstation boards with a BIOS that lists Denmark dual cores. It suits unbuffered DDR builds qualified for 110 W parts. Check the board maker CPU list for the exact stepping. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Memory, PCIe and cooling

Memory is unbuffered DDR in two channels through the on-chip controller.

HyperTransport at 1000 MT/s links the CPU to the chipset. PCIe or AGP slots hang off the chipset.

Cooling uses a 110 W rated Socket 939 heatsink on the AMD retention frame with directed airflow.

Upgrade paths

On Socket 939 the upgrade is the AMD Athlon 64 FX-60 at 2.6 GHz with an unlocked multiplier for enthusiast boards, or Denmark 180 at 2.4 GHz for a lower cost. Beyond Socket 939 a move to Socket AM2 or F needs a new board and memory.