Intel Celeron 3865U vs Intel Pentium Gold 6500Y

Intel Celeron 3865U

The Intel Celeron 3865U is an ULV (ultra low voltage) dual-core SoC based on the Kaby-Lake architecture and has been launched in the first quarter of 2017. The CPU can be found in ultrabooks as well as normal notebooks. In addition to two CPU cores clocked at 1.8 GHz (no Turbo Boost, no HyperThreading), the chip also integrates an HD Graphics 610 GPU and a dual-channel DDR4-2133/DDR3L-1600 memory controller. The SoC is manufactured using a 14 nm process with FinFET transistors.

Architecture

Intel basically uses the same micro architecture compared to Skylake, so the per-MHz performance does not differ. The manufacturer only reworked the Speed Shift technology for faster dynamic adjustments of voltages and clocks, and the improved 14nm process allows much higher frequencies combined with better efficiency than before.

Performance

Due to the missing Turbo Boost and the low clock speeds, especially the single thread performance is very limited which results in a lower performance even for lower demanding tasks. The performance should be noticeably slower than the Celeron 3965 which offers 400 MHz higher clocked CPU cores. Therefore, the CPU is only suited for entry level tasks like office, web surfing and multimedia.

Graphics

The integrated graphics unit called HD Graphics 610 (similar to the HD Graphics 510) represents the "GT1" version of the Kaby Lake GPU (Intel Gen. 9). Its 12 Execution Units, also called EUs, are clocked at 300 - 900 MHz and offer a performance somewhat below the older HD Graphics 4400. Only a few games of 2015 can be played smoothly in lowest settings.

Power Consumption

Specified at a TDP of 15 W (including CPU, GPU and memory controller), the CPU is best suited for small notebooks and ultrabooks (11-inches and above). Optionally, the TDP can be lowered to 10 watts (cTDP down), reducing both heat dissipation and performance and allowing even more compact designs.

Intel Pentium Gold 6500Y

The Intel Pentium Gold 6500Y is an energy-efficient, dual-core SoC designed for use in Windows tablets and passively cooled laptops. The Pentium is based on the old Amber Lake architecture that was initially introduced in 2018. The CPU was unveiled in Q1 2021; it is, in fact, not very different from Intel Core m3-8100Y, the only difference between the two being the slightly slower iGPU model (23 EU UHD Graphics 615 vs 24 EU UHD Graphics 615).

The two CPU cores run at 1.1 GHz to 3.4 GHz and are Hyper-Threading-enabled for 4 processing threads in total.

Architecture

Amber Lake family products are not known to have many improvements compared to the previous Kaby Lake and Skylake processors. They all share nearly the same per-MHz performance and nearly the same set of capabilities. Amber Lake processors do, however, have slightly higher clock speeds in comparison to their immediate predecessors.

Pentium 6500Y has a built-in dual-channel DDR3L-1600/LPDDR3-1866 memory controller as well as several PCI-Express 3.0 lanes for connecting graphics cards, SSDs and other devices. Four PCI-Express 3.0 lanes allow for read/write rates of up to 3.9 GB/s, provided a suitably fast NVMe SSD is used.

Please note this is not a user-replaceable CPU. It is supposed to get soldered permanently on to the motherboard (BGA1515 socket interface).

Performance

While we have not tested a single system built around the 6500Y as of August 2023, we have tested at least one laptop featuring the Core i3-10100Y, a chip that's just a little faster (Amber Lake, 2 cores, 4 threads, up to 3.9 GHz). Based on that, we expect the 6500Y to trail behind the AMD 3020e and the AMD 3050e just slightly. In other words, this is a very slow chip, as of mid 2023.

Graphics

The Intel UHD Graphics 615 normally has 24 Execution Units at its disposal but, for reason unbeknownst to us, just 23 EUs are active in the case of this Pentium. The graphics adapter is not much different from the HD Graphics 615 as found in 7th Gen Y-class Intel Core processors. As such, it has no support for SUHD 4320p monitors, nor can it HW-decode AV1, the latest video codec. Just the more usual VP9, AVC and HEVC are supported.

The UHD Graphics runs at 300 MHz to 900 MHz. This is not a GPU that a gamer would be happy with; very poor 3D performance is to be expected because of the thermal constraints (both Core m3-8100Y and Pentium 6500Y were created with thin tablets and ultra-thin laptops in mind) as well as the rather low TDP of the SoC. Most games will not be playable even if set to Lowest quality preset at 720p resolution. The least graphically intensive titles, like Farming Simulator 19, will pose no problem for the iGPU, though.

Power consumption

The chip is manufactured on one of the old 14 nm Intel processes for fairly unimpressive, as of late 2022, energy efficiency.

The Pentium 6500Y has a default TDP of 5 W (also known as the long-term power limit), half a watt higher than its immediate predecessors; despite the difference, a value this low makes the Pentium more than suitable for use in ultra-thin, passively cooled laptops, tablets, mini-PCs. The default TDP can be reduced slightly (with 3.5 W being the lowest Intel-recommended value) or increased (up to 7 W are possible) by laptop makers if needed, with clock speeds and performance changing accordingly as a result.