Intel Celeron B840 socket: Socket G2
The Intel Celeron B840 uses the Socket G2 socket. It is a 35 W dual core Sandy Bridge mobile part at 1.9 GHz, the fastest of the B800 series covered here.
- Socket
- Socket G2
- Launched
- July 2011
- Cores and threads
- 2 and 2
- Base power
- 35 W
- Codename
- Sandy Bridge
- Segment
- Mobile (socketed)
- Family
- Intel Celeron
- Clocks
- 1.9 GHz
Intel Celeron B840 specifications
| Cores | 2 |
|---|---|
| Threads | 2 |
| Core architecture | Sandy Bridge cores on 32 nm |
| Clocks | 1.9 GHz (no turbo) |
| Cache | 2 MB Intel Smart Cache (L3) |
| Processor base power (TDP) | 35 W |
| Manufacturing process | 32 nm |
| Memory support | DDR3-1066 and 1333, two channels, up to 16 GB |
| PCI Express | 16 lanes from the CPU, PCIe 2.0 |
| Integrated graphics | Intel HD Graphics |
| Multiplier | Locked |
| Package | FCPGA988 (37.5 × 37.5 mm) |
Motherboard compatibility
Intel Celeron B840 needs a motherboard with a Socket G2 socket. Chipset by chipset data for this codename is not recorded yet. See the Socket G2 chipset list and the board maker's CPU support list.
Socket G2 at a glance
| Type | rPGA, 988 contacts |
|---|---|
| Package size | 37.5 × 37.5 mm |
| Introduced | January 2011 |
| Memory | DDR3 and DDR3L, two channels, 1066 to 1600 MT/s |
| Cooler mounting holes | Board specific (laptop heatsink) |
What the Celeron B840 is
Intel Celeron B840 is a dual core Sandy Bridge mobile processor that Intel released in July 2011 as the top of the early B800 line. It runs at a fixed 1.9 GHz with no turbo and no Hyper-Threading, so 2 cores give 2 threads. Cache is 2 MB Intel Smart Cache. Power stays at 35 W on a 32 nm process.
The extra 400 MHz over the B800 shortens everyday waits. Web pages render faster and large documents scroll with less lag. The chip still targets basic laptops, not gaming rigs.
Graphics are Intel HD Graphics for Sandy Bridge. The block handles laptop panels, external monitors over board outputs, and video decode. Pair the chip with two DDR3 SODIMMs for the best shared graphics result.
Socket and motherboard compatibility
The Celeron B840 fits Socket G2 in FCPGA988 form. Sandy era HM65 and HM67 boards carry it, and later HM76 and HM77 boards boot Sandy parts directly. The BIOS must name the B840.
Retail boxes such as compact desktops also used this chip on mobile boards. The Samsung Chromebox shipped with the B840 on a Sandy mobile board, which shows how laptop silicon reached small desktop shells. Board support lists still decide each install.
Memory, PCIe and cooling
Memory support is DDR3-1066 and 1333, two channels, up to 16 GB. The controller runs at 1066 or 1333 MT/s depending on the fitted modules. ECC is not supported.
PCI Express is 16 lanes from the CPU at PCIe 2.0 for wireless, storage and I/O. Chromebox and laptop boards spend lanes on connectivity rather than graphics slots.
Cooling is a 35 W laptop assembly with a fan and heat pipe. The CPU cooler compatibility by socket guide explains why replacement heatsinks stay board specific.
Upgrade paths
On Socket G2 the B840 already sits near the top of the Celeron B range, so the next step is a Pentium B dual or a Core i3 M with Hyper-Threading. BIOS support and lid access decide whether the swap is practical. A socketed comparison is Intel Celeron B815.
When the laptop cannot be opened, storage and memory are the only upgrades. A platform move means a new laptop with a current package.
Frequently asked questions
What socket does the Intel Celeron B840 use?
It uses Socket G2 in FCPGA988 form.
Does the Celeron B840 have Hyper-Threading?
No. Two cores give 2 threads at a fixed 1.9 GHz.
What memory does the Celeron B840 use?
DDR3-1066 and 1333, two channels, up to 16 GB.
What is the upgrade path from a Celeron B840?
It can move to Pentium B or Core i3 M parts where access and BIOS allow it.
Sources and verification
- Intel Celeron B840 Specs (TechPowerUp)
- Samsung Chromebox review with Celeron B840 1.9 GHz dual core 35 W (Tom's Hardware)
Facts last checked against these sources on . Page last edited on .