Intel Core i5-3330S socket: LGA 1155

What the Core i5-3330S is

Intel Core i5-3330S is a quad core Ivy Bridge desktop processor that Intel released in September 2012 for efficient towers and small forms. It runs at 2.7 GHz base with Turbo Boost 2.0 to 3.2 GHz, and it carries 6 MB Intel Smart Cache. The four cores have no Hyper-Threading, so threads equal cores at 4. Power is rated at 65 W, which is 12 W below the standard 77 W i5 of the same generation.

Graphics are Intel HD Graphics 2500 at 650 MHz to 1050 MHz, with three display support and Quick Sync video. That block covers office monitors and video playback, while a discrete card can take over through PCIe where needed. The chip uses the 22 nm Ivy Bridge core with AVX instructions and a dual channel DDR3 controller on die.

The S suffix marks the lower power tune. Base clock drops 300 MHz against the Core i5-3330, while turbo still reaches 3.2 GHz for short bursts. Systems pair it with B75 or H77 boards, 8 GB of DDR3 and a SATA SSD for quiet office duty. The How to find your CPU socket type guide shows how to confirm the socket before ordering a spare.

Socket and motherboard compatibility

The Core i5-3330S fits LGA 1155 in FCLGA1155 form with 1,155 lands. Any 7 series board boots it with a shipping BIOS, including H77, Z77, Z75, B75, Q77 and Q75. Most 6 series boards accept it after a BIOS update that adds Ivy Bridge microcode, except B65, Q65 and Q67 designs that stay with Sandy Bridge. The update must be installed before the new chip goes in, often with a Sandy Bridge CPU still fitted.

Power at 65 W suits all desktop LGA 1155 designs, from slim office boards to Z77 ATX. Memory choice matters more than power here: the manual lists qualified DDR3-1333 and 1600 DIMMs. The Socket vs chipset: what decides whether a CPU works guide covers Intel pairing rules, and the CPU cooler compatibility by socket guide explains the shared 75 mm mounting pattern.

Memory, PCIe and cooling

Memory support is DDR3-1333 and 1600, two channels, up to 32 GB for 25.6 GB/s peak. Two matched DIMMs give the rated bandwidth, and the HD 2500 block that shares system RAM benefits first. There is no DDR4 option on this socket, so a move to DDR4 means leaving LGA 1155. ECC is not supported on this client SKU.

PCI Express is 16 lanes from the CPU at PCIe 3.0 with Ivy Bridge, split by the board as 1x16, 2x8 or 1x8 plus 2x4. Most builds in this class stay on integrated graphics, since HD 2500 covers office work and video. A low profile card of the era pairs without waste where a slot is free, and the 65 W envelope leaves room in small power supplies.

Cooling follows the 65 W rating with a 69.1 C case limit on the S parts. The stock Intel cooler suits office loads, while a compact tower helps sustained all core turbo. Mounting uses push pins on 75 × 75 mm spacing shared with LGA 1156, 1150, 1151 and 1200.

Upgrade paths

Within LGA 1155 the Core i5-3330S sits in the efficient quad group. A same socket move can add clocks while staying near 65 W, for example to Intel Core i5-3470S at 2.9 GHz to 3.6 GHz, or to a standard 77 W part where the cooler allows it. The board stays, while memory and the cooler often carry over. Intel Pentium G2020 shows a slower Ivy option on the same socket for comparison.

A larger move means a new socket with DDR4. Intel moved mainstream desktops through LGA 1200 with different pin layouts and cooler spacing. That move needs a new board, new memory and often a new bracket. Keep the LGA 1155 board for secondary duty where it still runs well.