Intel Core i7-3770S socket: LGA 1155

What the Core i7-3770S is

Intel Core i7-3770S is a low power quad core Ivy Bridge desktop processor that Intel released in April 2012 for efficient towers. It runs at 3.1 GHz base with Turbo Boost 2.0 to 3.9 GHz, with 8 MB Intel Smart Cache and Hyper-Threading for 8 threads. Power is rated at 65 W, which trims 12 W against the standard i7-3770 while keeping the same 3.9 GHz peak.

Graphics are Intel HD Graphics 4000 at 650 MHz to 1150 MHz. The block drives office displays and video, with Quick Sync for encodes. The chip shares the 22 nm Ivy core, AVX and dual channel DDR3 controller of the 77 W twin, so threaded work loses little except sustained base clock.

That balance suited office fleets and home towers that wanted eight threads without 77 W heat. Single thread bursts match the faster twin, while all core loads run slightly slower. Boards pair it with B75, H77 or Q77 and an SSD for quiet response. The LGA, PGA and BGA: CPU package types explained guide places this LGA desktop part against mobile BGA forms.

Socket and motherboard compatibility

The Core i7-3770S fits LGA 1155 in FCLGA1155 form. 7 series boards boot it with a shipping BIOS, and most 6 series H61, H67, P67 and Z68 boards accept it after a BIOS update with Ivy Bridge microcode. B65, Q65 and Q67 stay Sandy Bridge only. Intel documents the chip as a 65 W Ivy part, so any LGA 1155 board covers the power.

Slim and standard boards both suit it, with selection turning on ports and management. Q77 fits managed fleets, while H77 covers home builds. The Socket vs chipset: what decides whether a CPU works guide walks through the update path for older boards.

Memory, PCIe and cooling

Memory support is DDR3-1333 and 1600, two channels, up to 32 GB for 25.6 GB/s. Two matched DIMMs give that peak and feed the eight threads plus the shared HD 4000 block. ECC is not supported, and DDR4 belongs to newer sockets.

PCI Express is 16 lanes from the CPU at PCIe 3.0, set as 1x16, 2x8 or 1x8 plus 2x4. Many builds stay on HD 4000 for office work, since two displays already run from the chip. A mainstream 2012 card matches the eight threads where light creation or extra monitors are planned.

Cooling follows the 65 W S rating with a 69.1 C case limit class. The stock cooler stays quiet at office loads, while a compact tower helps hold turbo under repeated bursts. The 75 × 75 mm mount is shared across LGA generations.

Upgrade paths

On LGA 1155 the Core i7-3770S sits near the top of the 65 W group. A step to the 77 W i7-3770 adds base clock on the same board where the cooler allows it, while memory and storage carry over. The BIOS must list the new model before the swap. A slower quad reference on the same socket is Intel Core i5-3570.

A platform move to DDR4 boards such as LGA 1200 needs a new board, new RAM and a new mount. Keep the 3770S board for efficient desk duty where its high turbo still covers bursts.