Intel Pentium G645T socket: LGA 1155

What the Pentium G645T is

Intel Pentium G645T is a dual core Sandy Bridge desktop processor that Intel released in September 2012 for low power office towers. It runs at a fixed 2.5 GHz with no turbo, with 3 MB Intel Smart Cache and 2 threads. Power is rated at 35 W on a 32 nm process. The T suffix marks the low power tune, with an extra 100 MHz over the G640T from June.

Graphics are Intel HD Graphics for 2nd Gen at 650 MHz to 1100 MHz. The block drives office monitors and video without a card. The memory controller takes DDR3 at 1066 MT/s in two channels, which fits the low cost boards of the period.

The 35 W rating suits slim towers that cannot cool 65 W parts. Boards pair it with H61, B75 or H77 and 4 GB of RAM for quiet service. The How to find your CPU socket type guide shows how to confirm the socket in a compact case.

Socket and motherboard compatibility

The Pentium G645T fits LGA 1155 in FCLGA1155 form. Both 6 series and 7 series boards boot Sandy Bridge directly, so H61, B75, H77, Z77 and business sets all work. No update is needed for Sandy parts.

At 35 W the chip fits slim and standard boards alike. Display outputs decide board choice for the HD Graphics block. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules, and Intel Pentium G640T shows the slower T twin on the same socket.

Memory, PCIe and cooling

Memory support is DDR3-1066, two channels, up to 32 GB. Two matched DIMMs help the shared graphics block, though dual core office loads rarely saturate the link. ECC is not supported.

PCI Express is 16 lanes from the CPU at PCIe 2.0. Most G645T builds stay on integrated graphics for office displays. A low profile card fits where extra outputs are needed.

Cooling follows the 35 W rating with a small stock heatsink. Low heat allows quiet fans in slim cases. The 75 × 75 mm mount matches standard LGA coolers.

Upgrade paths

On LGA 1155 the Pentium G645T can move to faster Pentium duals, Core i3 parts with Hyper-Threading, or quad i5 and i7 chips on the same board. Ivy models need a current BIOS, while Sandy models fit directly. Memory and storage carry over.

A platform move to DDR4 boards such as LGA 1200 needs a new board and RAM. Keep the G645T board for quiet terminal duty where dual Sandy cores still work.