Intel
IntelBX80684I58400
  

4 Cores, 4 Threads @1.10 GHz, Apollo Lake.
Release date ≈ Q4 2016.

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

Real World Speed
Performance profile from 318,857 user samples
6,637 User Benchmarks
Best Bench: 36% Base clock 1.1 GHz, turbo 2.1 GHz (avg)
Worst Bench: 15% Base clock 1.1 GHz, turbo 1.3 GHz (avg)
Poor: 15% Great: 36%
SPEED RANK: 1373rd / 1442
Gaming
Gaming 27%
Raft
Desktop
Desktop 29%
Raft
Workstation
Workstation 20%
Surfboard
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
27 % 81.8 % Hugely faster effective speed.
+203%
Memory
Avg. Memory Latency
32 Pts 84.9 Pts Hugely lower memory latency.
+165%
1-Core
Avg. Single Core Speed
35.6 Pts 113 Pts Hugely faster single-core speed.
+217%
2-Core
Avg. Dual Core Speed
69.7 Pts 224 Pts Hugely faster dual-core speed.
+221%
4-Core
Avg. Quad Core Speed
127 Pts 434 Pts Hugely faster quad-core speed.
+242%
8-Core
Avg. Octa Core Speed
129 Pts 564 Pts Hugely faster octa-core speed.
+337%
Memory
OC Memory Latency
46.5 Pts 94.2 Pts Hugely lower OC memory latency.
+103%
1-Core
OC Single Core Speed
40.6 Pts 120 Pts Hugely faster OC single-core speed.
+196%
2-Core
OC Dual Core Speed
78.6 Pts 237 Pts Hugely faster OC dual-core speed.
+202%
4-Core
OC Quad Core Speed
156 Pts 471 Pts Hugely faster OC quad-core speed.
+202%
8-Core
OC Octa Core Speed
156 Pts 657 Pts Hugely faster OC octa-core speed.
+321%
Market Share
Based on 67,718,108 CPUs tested
Market Share
Market Share (trailing 30 days)
0 % 0.9 % Insanely higher market share.
+∞%
User Rating
UBM User Rating
52 % 61 % More popular.
+17%
Age
Newest
88+ Months 78 Months More recent.
+11%
64-Core
OC Multi Core Speed
156 Pts 675 Pts Hugely faster OC 64-core speed.
+333%
64-Core
Avg. Multi Core Speed
127 Pts 588 Pts Hugely faster 64-core speed.
+363%
Launch Date
Launch Date
Q3'16 Q4'17
Cache
Cache
2 MB L2 9 MB
Recommended Price
Recommended Customer Price
$107.00 N/A
Max Memory Size
Max Memory Size (dependent on memory type)
8 GB 64 GB
Memory Types
Memory Types
DDR3L/LPDDR3 up to 1866 MT/s; LPDDR4 up to 2400 MT/s DDR4-2666
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics 500 Intel® UHD Graphics 630
Graphics Base Frequency
Graphics Base Frequency
200.00 MHz 350 MHz
InTru 3D Tech
Intel® InTru™ 3D Technology
No Yes
Graphics Video Max Memory
Graphics Video Max Memory
8 GB 64 GB
Package Size
Package Size
24mm x 31mm 37.5mm x 37.5mm
Turbo Boost Tech
Intel® Turbo Boost Technology ‡
No 2.0
OS Guard
Intel® OS Guard
No Yes
PCI Express Revision
PCI Express Revision
2.0 3.0
PCI Express Configurations
PCI Express Configurations ‡
1x4 + 1x2 or 4x1 or 2x1+1x2 + 1x2 Up to 1x16 or 2x8 or 1x8+2x4
Max # of PCI Express Lanes
Max # of PCI Express Lanes
6 16

More specs » More specs »
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If you're after low-power computing then this is a good, basic processor to get work done. Based on the 2016 14nm Apollo Lake architecture it is designed for mobile efficiency and comes in a range of laptops from budget to mid-tier. It uses about 4 to 6 watts under load (yes, four to six whole watts) and generally idles under 2 watts. It has four cores with four threads and has a 1.1GHz base clock with a 2.2GHz boost, with the included HD 500 series graphics boasting 12 execution units running at up to 700MHz, although information regarding this is limited given its budget application. If you're processing data then forget anything with this. Although possible, it'll take forever as you're limited to 256k of L1 and 2MB of L2 cache - no L3 at all. The included graphics won't help you here either. For everyday processing, or a cheap laptop for the kids, this is a decent processor but throw more than 2 or 3 basic tasks at it and it flounders. Anything more complex than everyday word processing, internet and multimedia is beyond it, but given that's what the majority of users will be doing this isn't an issue. The bonus? Ultra-light, thin and quiet latops with passive cooling and sub- $250USD price points. Not bad! [Jul '19 boingk]

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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]

MORE DETAILS

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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