Intel Core i7-840QM socket: Socket G1
The Intel Core i7-840QM uses the Socket G1 socket. It is a 45 W quad core Clarksfield mobile part at 1.867 GHz with Turbo Boost to 3.2 GHz, Hyper-Threading and 8 MB of L3 cache.
- Socket
- Socket G1
- Launched
- June 20, 2010
- Cores and threads
- 4 and 8
- Base power
- 45 W
- Codename
- Clarksfield
- Segment
- Mobile (socketed)
- Family
- Intel Core i7
- Clocks
- 1.87 / 3.2 GHz
Intel Core i7-840QM specifications
| Cores | 4 |
|---|---|
| Threads | 8 |
| Core architecture | Clarksfield cores on 45 nm |
| Clocks | 1.867 GHz base, 3.2 GHz Turbo Boost |
| Cache | 1 MB L2 (4 × 256 KB), 8 MB shared L3 |
| Processor base power (TDP) | 45 W |
| Manufacturing process | 45 nm |
| Memory support | DDR3-1333, two channels, up to 8 GB |
| PCI Express | PCIe Gen 2 x16 from the CPU |
| Integrated graphics | None (board or discrete graphics) |
| Multiplier | Locked |
| Package | Socket G1 (PGA988, 988 pins) |
Motherboard compatibility
Intel Core i7-840QM needs a motherboard with a Socket G1 socket. Chipset by chipset data for this codename is not recorded yet. See the Socket G1 chipset list and the board maker's CPU support list.
Socket G1 at a glance
| Type | rPGA, 988 contacts |
|---|---|
| Package size | n/a |
| Introduced | September 2009 |
| Memory | DDR3, two channels, up to 8 GB |
| Cooler mounting holes | Board specific (laptop heatsink) |
What the Core i7-840QM is
The Intel Core i7-840QM is a quad core Clarksfield mobile processor that Intel launched on June 20, 2010 at 1.867 GHz with Turbo Boost to 3.2 GHz. Hyper-Threading gives eight threads from four Nehalem cores, backed by 256 KB of L2 per core and 8 MB of shared L3 cache. Power is rated at 45 W on a 45 nm process with 774 million transistors on a 296 mm² die.
The 840QM sits below the Extreme 920XM and 940XM, trading an unlocked multiplier for a lower price at $568 MSRP. Against the 740QM it adds 2 MB of L3 cache and base speed for rendering. Turbo reaches 3.2 GHz on one core and steps down as more cores load.
There is no graphics on Clarksfield. Display comes from the board chipset or discrete mobile graphics with DDR3-1333 memory.
Socket and motherboard compatibility
The Core i7-840QM fits Socket G1 with 988 pins. PM55, HM55, QM57 and HM57 boards boot it directly with a mid 2010 BIOS. Check the notebook vendor list because cooling must handle 45 W plus discrete graphics.
The Socket vs chipset: what decides whether a CPU works guide covers pairing rules, and the Intel Core i5-480M page shows a dual core alternative on the same socket.
Memory, PCIe and cooling
Memory is DDR3-1333 in two channels up to 8 GB for 21.3 GB/s.
PCIe Gen 2 x16 comes from the CPU package for discrete graphics.
Cooling uses a strong vendor heat pipe assembly rated for 45 W with dual pipes on most designs.
Upgrade paths
On Socket G1 the upgrade is the 940XM Extreme with an unlocked multiplier on the same board. Beyond Socket G1 a move to Sandy Bridge quad needs a new notebook.
Frequently asked questions
What socket does the Core i7-840QM use?
Socket G1, the 988-pin package on PM55, HM55, QM57 and HM57 boards.
How many cores does the Core i7-840QM have?
Four cores and eight threads at 1.867 GHz base with Turbo Boost to 3.2 GHz, with 256 KB of L2 per core and 8 MB of shared L3 cache.
What memory works with the Core i7-840QM?
DDR3-1333 in two channels up to 8 GB.
Sources and verification
Facts last checked against these sources on . Page last edited on .