UserBenchmark: Intel Core i5-8400 vs i9-7900X

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IntelBX80673I97900X

BUY • $455

IntelBX80684I58400

BUY • $131

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Real World Speed

Performance profile from 331,652 user samples

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19,432 User Benchmarks

Best Bench: 92% Base clock 3.3 GHz, turbo 4.95 GHz (avg)
Worst Bench: 72% Base clock 3.3 GHz, turbo 0.7 GHz (avg)

Poor: 72% Great: 92%

SPEED RANK: 209^th / 1442

Gaming 82%

Aircraft carrier

Desktop 83%

Aircraft carrier

Workstation 89%

Aircraft carrier

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: 212^th / 1442

Gaming 82%

Aircraft carrier

Desktop 83%

Aircraft carrier

Workstation 66%

Battle cruiser


Effective Speed Effective CPU Speed		81.9 %	+0%		81.8 %


Memory Avg. Memory Latency	76.1 Pts		84.9 Pts	Lower memory latency. +12%
1-Core Avg. Single Core Speed	123 Pts	Slightly faster single-core speed. +9%	113 Pts
2-Core Avg. Dual Core Speed	243 Pts	Slightly faster dual-core speed. +8%	224 Pts
4-Core Avg. Quad Core Speed	470 Pts	Slightly faster quad-core speed. +8%	434 Pts
8-Core Avg. Octa Core Speed	898 Pts	Much faster octa-core speed. +59%	564 Pts


Memory OC Memory Latency	87.6 Pts		94.2 Pts	Slightly lower OC memory latency. +8%
1-Core OC Single Core Speed	138 Pts	Faster OC single-core speed. +15%	120 Pts
2-Core OC Dual Core Speed	276 Pts	Faster OC dual-core speed. +16%	237 Pts
4-Core OC Quad Core Speed	548 Pts	Faster OC quad-core speed. +16%	471 Pts
8-Core OC Octa Core Speed	1069 Pts	Much faster OC octa-core speed. +63%	657 Pts

Market Share

Based on 67,715,661 CPUs tested

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Market Share Market Share (trailing 30 days)	0.07 %	1 %	Insanely higher market share. +1,329%
Value Value For Money	71.5 %	101 %	Much better value. +41%
User Rating UBM User Rating	55 %	61 %	More popular. +11%
Price Price (score)	$455	$131	Much cheaper. +71%


Age Newest	81 Months		78 Months	+4%
TDP Thermal Design Power (TDP)	140 Watts		65 Watts	Much more energy efficient. +54%
Cores CPU Processing Cores	10 cores	Much higher core count. +67%	6 cores
Threads CPU Processing Threads	20 threads	Hugely higher thread count. +233%	6 threads
Lithography Manufacturing process	14 nm		14 nm
Base Clock Base Clock Speed	3.8 GHz	Much faster base frequency. +36%	2.8 GHz
Turbo Clock Turbo Clock Speed	4.3 GHz	Slightly faster turbo frequency. +8%	4 GHz
64-Core OC Multi Core Speed	1853 Pts	Hugely faster OC 64-core speed. +175%	675 Pts
64-Core Avg. Multi Core Speed	1589 Pts	Hugely faster 64-core speed. +170%	588 Pts


Series CPU Architecture	Skylake-X	Coffee Lake
Socket Motherboard Socket	LGA2066	FCLGA1151
Graphics Integrated Graphics	None	UHD 630
Launch Date Launch Date	Q2'17	Q4'17
Cache Cache	13.75 MB L3	9 MB
Instruction Set Extensions Instruction Set Extensions	SSE4.1/4.2, AVX2, AVX-512	SSE4.1/4.2, AVX2
Recommended Price Recommended Customer Price	$989.00 - $999.00	N/A
Max Turbo Frequency Max Turbo Frequency	4.30 GHz	4.00 GHz
Thermal Solution Specification Thermal Solution Specification	PCG 2017X	PCG 2015C (65W)
Max Memory Size Max Memory Size (dependent on memory type)	128 GB	64 GB
Memory Channels Max # of Memory Channels	4	2
Hyper-Threading Tech Intel® Hyper-Threading Technology ‡	Yes	No
Max # of PCI Express Lanes Max # of PCI Express Lanes	44	16
	More specs »	More specs »

Intel’s core i9-7900X, from the Skylake-X series, is Intel’s latest 10-core, 20-thread flagship processor. It's the first to bear the i9 moniker and utilize the new X299 (Basin Falls) chipset/motherboard. The 7900X is the fastest CPU on the market today, however, imminent competition from AMD’s 16-core, 32-thread Ryzen Threadripper CPUs and the forthcoming release of more Intel Core X series mean that its reign will be a short one. The i9-7900X supersedes the 10-core Broadwell-E core i7-6950X that held the crown for little over a year. Both are extremely powerful and pricey high end desktop processors (HEDTs) which excel in multi-threaded tasks such as media encoding. However, despite the same power draw (TDP 140W), the newer i9-7900X betters the i7-6950X in terms of peak overclocked performance by 10% mostly thanks to increased clock speeds from 3.0GHz/4.0GHz to 3.3GHz/4.3GHz for base/turbo. It also betters the i7-6950X on price by around 28%. This all translates to the i9-7900X offering around 20% more value for money, even despite its eye-watering $999 price tag. The more accessible pricing (albeit not accessible for the majority) and hurried release of the i9-7900k to market is widely perceived as a reaction to AMD’s Ryzen Threadripper CPUs, rumoured for release towards the end of July 2017. So if you want to own the fastest consumer CPU in the world, it would be wise to wait for the dust to settle. ^{[Jul '17 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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CPU	GPU	SSD
Intel Core i5-13600K $279	Nvidia RTX 4060 $300	Crucial MX500 250GB $40
Intel Core i5-12400F $134	Nvidia RTX 4060-Ti $385	Samsung 850 Evo 120GB $80
Intel Core i5-12600K $184	Nvidia RTX 4070 $409	Samsung 860 Evo 250GB $52

HDD	RAM	USB
Seagate Barracuda 1TB (2016) $39	Corsair Vengeance LPX DDR4 3200 C16 2x8GB $40	SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $35	Corsair Vengeance LPX DDR4 3000 C15 2x8GB $43	SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $51	G.SKILL Trident Z DDR4 3200 C14 4x16GB $351	SanDisk Ultra Fit 32GB $16

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