IntelBX80646G1840
IntelBX80684I58400

2 Cores, 2 Threads @2.8GHz, Haswell.
Release date: Q2 2014.

6 Cores, 6 Threads @2.8GHz, Coffee Lake.
Release date: Q4 2017.

Real World Speed
Performance profile from 319,744 user samples
7,524 User Benchmarks
Best Bench: 58% Base clock 2.8 GHz, turbo 2.8 GHz (avg)
Worst Bench: 32% Base clock 2.8 GHz, turbo 2.8 GHz (avg)
Poor: 32% Great: 58%
SPEED RANK: 839th / 1442
Gaming
Gaming 49%
Yacht
Desktop
Desktop 58%
Gunboat
Workstation
Workstation 34%
Sail boat
312,220 User Benchmarks
Best Bench: 89% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 61% Base clock 2.8 GHz, turbo 0.8 GHz (avg)
Poor: 61% Great: 89%
SPEED RANK: 212th / 1442
Gaming
Gaming 82%
Aircraft carrier
Desktop
Desktop 83%
Aircraft carrier
Workstation
Workstation 66%
Battle cruiser
Effective Speed
Effective CPU Speed
48.6 % 81.8 % Much faster effective speed.
+68%
Memory
Avg. Memory Latency
73.8 Pts 84.9 Pts Lower memory latency.
+15%
1-Core
Avg. Single Core Speed
72.2 Pts 113 Pts Much faster single-core speed.
+57%
2-Core
Avg. Dual Core Speed
135 Pts 224 Pts Much faster dual-core speed.
+66%
4-Core
Avg. Quad Core Speed
138 Pts 434 Pts Hugely faster quad-core speed.
+214%
8-Core
Avg. Octa Core Speed
140 Pts 564 Pts Hugely faster octa-core speed.
+303%
Memory
OC Memory Latency
90.2 Pts 94.2 Pts +4%
1-Core
OC Single Core Speed
81 Pts 120 Pts Much faster OC single-core speed.
+48%
2-Core
OC Dual Core Speed
160 Pts 237 Pts Much faster OC dual-core speed.
+48%
4-Core
OC Quad Core Speed
159 Pts 471 Pts Hugely faster OC quad-core speed.
+196%
8-Core
OC Octa Core Speed
160 Pts 657 Pts Hugely faster OC octa-core speed.
+311%
Market Share
Based on 67,774,745 CPUs tested
Market Share
Market Share (trailing 30 days)
0 % 0.84 % Insanely higher market share.
+∞%
Value
Value For Money
71.2 % 101 % Much better value.
+41%
User Rating
UBM User Rating
52 % 61 % More popular.
+17%
Price
Price (score)
$69 Much cheaper.
+47%
$131
Age
Newest
120 Months 78 Months Much more recent.
+35%
TDP
Thermal Design Power (TDP)
53 Watts More energy efficient.
+18%
65 Watts
Cores
CPU Processing Cores
2 cores 6 cores Hugely higher core count.
+200%
Threads
CPU Processing Threads
2 threads 6 threads Hugely higher thread count.
+200%
Lithography
Manufacturing process
22 nm 14 nm Much newer manufacturing.
+36%
Base Clock
Base Clock Speed
2.8 GHz 2.8 GHz
Turbo Clock
Turbo Clock Speed
2.8 GHz 4 GHz Much faster turbo frequency.
+43%
64-Core
OC Multi Core Speed
160 Pts 675 Pts Hugely faster OC 64-core speed.
+322%
64-Core
Avg. Multi Core Speed
139 Pts 588 Pts Hugely faster 64-core speed.
+323%
Series
CPU Architecture
Haswell Coffee Lake
Socket
Motherboard Socket
FCLGA1150 FCLGA1151
Graphics
Integrated Graphics
HD UHD 630
Launch Date
Launch Date
Q2'14 Q4'17
Cache
Cache
2 MB 9 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2 SSE4.1/4.2, AVX2
Lithography
Lithography
22 nm 14 nm
Recommended Price
Recommended Customer Price
$42.00 N/A
Bus Speed
Bus Speed
5 GT/s DMI2 8 GT/s DMI3
Thermal Solution Specification
Thermal Solution Specification
PCG 2013C PCG 2015C (65W)
Max Memory Size
Max Memory Size (dependent on memory type)
32 GB 64 GB
Memory Types
Memory Types
DDR3-1333, DDR3L-1333 @ 1.5V DDR4-2666
ECC Memory Supported
ECC Memory Supported ‡
Yes No
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics Intel® UHD Graphics 630
Graphics Video Max Memory
Graphics Video Max Memory
1.7 GB 64 GB
Turbo Boost Tech
Intel® Turbo Boost Technology ‡
No 2.0
Virtualization for Directed I/O (VT-d)
Intel® Virtualization Technology for Directed I/O (VT-d) ‡
No Yes
AES New Instructions
Intel® AES New Instructions
No Yes
PCI Express Revision
PCI Express Revision
Up to 3.0 3.0
PCI Express Configurations
PCI Express Configurations ‡
Up to 1x16, 2x8, 1x8+2x4 Up to 1x16 or 2x8 or 1x8+2x4

More specs » More specs »
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The Intel Celeron G1840 is a budget dual-core processor for desktops. Released in Q2 of 2014, this Haswell based CPU is 10% faster than its Ivy Bridge Celeron predecessors such as the G1630. The G1840 is very similar to the Celeron G1850 and G1830 which were also launched in the first half of 2014, which begs the question from Intel: Why? With its base clock speed of 2.8 GHz, the G1840 scores an average effective speed of 73 which is ample for basic processing needs. The G1840 has a TDP of just 53 Watts, so it's a low power, low heat and therefore low cost processor. Coupled with an SSD and a decent graphics card the G1840 will give a pretty good user experience, but the 100 MHz faster and similarly priced G1850 is a better option. [Nov '14 CPUPro]

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The i5-8400 is a competitively priced hex-core processor from Intel’s 8th generation of Core processors (Coffee Lake). Along with the release of the unlocked i5-8600K, this is the first time that six-core processors have featured in the i5 line-up. Like the other Coffee Lake processors, the i5-8400 is based upon an improved version of Intel’s 14nm architecture which featured in both Skylake and Kaby Lake. Early benchmarks reveal that for average quad core usage (most games employ a maximum of four cores) the i5-8400 performs way above its pay grade. It achieves quad core mixed speeds close to Intel’s outgoing 2017 flagship the $300, quad-core, 8 thread i7-7700k, which to date has been a strong favourite for high-end gaming setups. On paper, the i5-8400 has a base clock of 2.8 GHz (Intel are significantly downplaying the performance of this SKU by giving it a relatively low nominal base clock), an all core boost of 3.8 GHz (this is the effective base clock figure that counts) and a single core boost of 4 GHz. This compares reasonably well to the i5-8600K which has a base clock of 3.6 GHz, all core boost of 4.1 GHz and a single core boost of 4.3 GHz. The i5-8400 also features 9MB of L3 cache and an energy-thrifty TDP of 65W. Priced at under $190, the i5-8400 offers fantastic value for money. Unfortunately, like the other Coffee Lake processors, the i5-8400 will require a new 300 series motherboard, and at the time of writing, the only available version is Intel’s high-end Z370 which isn't an ideal pairing for the i5-8400. The Z series motherboards are designed to cater for the unlocked and overclockable "K" SKUs. Cheaper 300 series motherboards will be available in 2018 at which time the 8400 will offer even better value for money. [Oct '17 CPUPro]

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Processor Rankings (Price vs Performance) April 2024 CPU Rankings

We calculate effective speed which measures real world performance for typical users. Effective speed is adjusted by current prices to yield a value for money rating. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top CPUs. [CPUPro]

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  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
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 Frequently Asked Questions

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