IntelBX80684I58400
AMDHDZ965FBGMBOX
$144

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

 $144 

4 Cores, 4 Threads @3.4GHz, K10.
Release date: Q1 2009.

Real World Speed
Performance profile from 355,662 user samples
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
43,442 User Benchmarks
Best Bench: 61% Base clock 4.4 GHz
Worst Bench: 35% Base clock 3.4 GHz, turbo 3.4 GHz (avg)
Poor: 35% Great: 61%
SPEED RANK: 725th / 1442
Gaming
Gaming 53%
Yacht
Desktop
Desktop 55%
Gunboat
Workstation
Workstation 37%
Jet ski
Effective Speed
Effective CPU Speed
81.8 % Much faster effective speed.
+56%
52.6 %
Memory
Avg. Memory Latency
84.9 Pts Lower memory latency.
+10%
76.9 Pts
1-Core
Avg. Single Core Speed
113 Pts Hugely faster single-core speed.
+136%
47.8 Pts
2-Core
Avg. Dual Core Speed
224 Pts Hugely faster dual-core speed.
+136%
94.8 Pts
4-Core
Avg. Quad Core Speed
434 Pts Hugely faster quad-core speed.
+163%
165 Pts
8-Core
Avg. Octa Core Speed
564 Pts Hugely faster octa-core speed.
+230%
171 Pts
Memory
OC Memory Latency
94.2 Pts Slightly lower OC memory latency.
+6%
88.9 Pts
1-Core
OC Single Core Speed
120 Pts Hugely faster OC single-core speed.
+112%
56.5 Pts
2-Core
OC Dual Core Speed
237 Pts Hugely faster OC dual-core speed.
+112%
112 Pts
4-Core
OC Quad Core Speed
471 Pts Hugely faster OC quad-core speed.
+126%
208 Pts
8-Core
OC Octa Core Speed
657 Pts Hugely faster OC octa-core speed.
+213%
210 Pts
Market Share
Based on 67,714,166 CPUs tested
Market Share
Market Share (trailing 30 days)
1.07 % Insanely higher market share.
+10,600%
0.01 %
Value
Value For Money
101 % Much better value.
+60%
63 %
User Rating
UBM User Rating
61 % Slightly more popular.
+9%
56 %
Price
Price (score)
$131 Slightly cheaper.
+9%
$144
Age
Newest
78 Months Much more recent.
+57%
181 Months
TDP
Thermal Design Power (TDP)
65 Watts Much more energy efficient.
+48%
125 Watts
Cores
CPU Processing Cores
6 cores Much higher core count.
+50%
4 cores
Threads
CPU Processing Threads
6 threads Much higher thread count.
+50%
4 threads
Lithography
Manufacturing process
14 nm Much newer manufacturing.
+69%
45 nm
Base Clock
Base Clock Speed
2.8 GHz 3.4 GHz Faster base frequency.
+21%
Turbo Clock
Turbo Clock Speed
4 GHz Faster turbo frequency.
+18%
3.4 GHz
64-Core
OC Multi Core Speed
675 Pts Hugely faster OC 64-core speed.
+223%
209 Pts
64-Core
Avg. Multi Core Speed
588 Pts Hugely faster 64-core speed.
+242%
172 Pts
Series
CPU Architecture
Coffee Lake K10
Socket
Motherboard Socket
FCLGA1151 AM2+ AM3
Graphics
Integrated Graphics
UHD 630 None
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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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At nearly five years of age the AMD Phenom II X4 965 has been included in the CPU group test primarily as a reference. This hugely successful CPU from AMD has been one of the most popular gaming PC's of all time. With superb Single threaded, and therefore real-world performance, the X4 was able to compete with Intel's first generation of Core chips in terms of raw processing power and it did so at a lower price point. Today of course the X4 processor has been far surpassed by Intel's third and fourth generation Core processors. [Feb '12 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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Group Test Results

  • 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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