CPU Comparison
Intel Core i5-8420T vs Intel Core i3-8300T
A side-by-side comparison of specs, performance and value. The Intel Core i5-8420T is a low-power desktop processor part of the 8th generation Coffee Lake family. Released in September 2018, it is a slight revision of the i5-8400T. Built on the 14nm process, it features 6 cores and 6 threads. The 'T' suffix indicates a 35W TDP, making it suitable for small form factor and energy-efficient systems. The base clock is 1.8 GHz, with a maximum turbo boost of 3.4 GHz, offering a minor bump over its predecessor. It includes 9 MB of Intel Smart Cache and supports dual-channel DDR4 memory up to 2666 MT/s. The integrated Intel UHD Graphics 630 handles standard display output. With 16 PCIe 3.0 lanes, it provides sufficient bandwidth for typical desktop expansions. Compatible with LGA 1151 sockets on 300-series chipsets, the i5-8420T is an OEM-focused chip designed for corporate environments and compact PCs where power efficiency is paramount.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
6 cores provide good office performance, but single-core is limited.
The larger cache makes desktop interactions and application loading feel slightly snappier than the 6MB 8100T.
Gaming
Marginally better than 8400T, but still too slow for modern gaming.
The 8MB cache helps slightly, but the lack of Turbo Boost and Hyper-Threading makes it unsuitable for gaming.
Virtualization
Suitable for basic VMs, but lacks threads.
8MB cache helps with VM context switching, but 4 threads is still a severe bottleneck.
Efficiency
Excellent 35W efficiency.
Matches the i3-8100T's excellent efficiency profile.
Specialized Performance
AI / ML
- No dedicated AI hardware.
- Slow CPU inference.
- No AI hardware.
- Fixed 3.2 GHz clock is too slow for meaningful inference.
Content Creation
Gaming
- Low clocks limit high-refresh gaming.
- Integrated graphics are weak.
- Needs a discrete GPU for any real gaming.
- Not intended for gaming.
- Fixed 3.2 GHz clock prevents acceptable frame rates in modern titles.
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- Low 35W TDP
- 6 cores for multi-tasking
- Runs cool and quiet
- Good for basic office use
Cons
- Very similar to 8400T
- Locked multiplier
- No Hyper-Threading
- Hard to find retail, OEM only
Pros
- 8MB L3 cache is larger than retail i3 alternatives
- 3.2 GHz fixed clock is 100 MHz higher than 8100T
- Low 35W power draw
- UHD Graphics 630 included
- Often cheap on the used market
Cons
- OEM-only, no retail warranty
- No Turbo Boost
- No Hyper-Threading
- Still only 4 threads
- DDR4-2400 memory limit
- PCIe 3.0 only
Competitors & Alternatives
Intel Core i5-8420T
- Compare head-to-headIntel Core i5-8400TRival
Low Power Desktop
- AMD Ryzen 5 2400GERival
Low Power Desktop
- Compare head-to-headIntel Core i5-8500TRival
Low Power Desktop
- AMD Ryzen 3 2200GERival
Budget Low Power
- Compare head-to-headIntel Core i3-8100TRival
Budget Low Power
- AMD Ryzen 5 3400GEAlt
Better integrated graphics.
Modern alternative with much better IPC.
Compare head-to-head- AMD Ryzen 5 5600GEAlt
Better efficiency and multi-core.
Intel Core i3-8300T
- Compare head-to-headIntel Core i3-8100TRival
Low-Power Desktop
- Compare head-to-headIntel Core i5-8400TRival
OEM Low-Power
- AMD Ryzen 3 3200GERival
Low-Power Desktop
- Compare head-to-headIntel Core i3-8100Rival
Standard Desktop
- AMD Ryzen 5 3400GERival
Low-Power Desktop
The 10th gen successor adds Hyper-Threading and Turbo Boost.
Compare head-to-headN/A
A Coffee Lake refresh option with better clocks.
Compare head-to-head
Our Verdict on Each
A modest refresh of the 8400T, offering slightly higher clocks in the same 35W envelope, primarily for OEM systems.
Best for: Finding a cheap used OEM PC with this chip for basic office work.
Read the full reviewA uniquely configured OEM chip that offers more cache than the retail i3-8100T. While still limited by no Turbo Boost or Hyper-Threading, the 8MB cache makes it the best performing 35W 8th gen i3.
Best for: Finding one salvaged from an OEM PC to use as a cheap LGA 1151v2 upgrade, as it outperforms the retail i3-8100T.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i5-8420T or Intel Core i3-8300T?
Based on our editorial ratings, the Intel Core i5-8420T comes out ahead with a score of 7.2/10. That said, the best choice depends on your workload — check the spec and performance breakdown above for gaming, productivity and efficiency differences.
Which is faster for gaming, Intel Core i5-8420T or Intel Core i3-8300T?
For gaming, the Intel Core i5-8420T leads with a gaming performance score of 52/100 among Intel Core i5-8420T and Intel Core i3-8300T.
Do Intel Core i5-8420T and Intel Core i3-8300T use the same socket?
Yes — all of these CPUs use the LGA 1151 socket, so they share compatible motherboards.
Which has more cores?
The Intel Core i5-8420T has the most cores. Core counts: Intel Core i5-8420T (6 cores), Intel Core i3-8300T (4 cores).
Which is faster in multi-core benchmarks?
The Intel Core i5-8420T posts the highest multi-core benchmark score. Multi-core results: Intel Core i5-8420T (8,600). Benchmark figures are approximate and workload-dependent.