Out of every generation of Intel processors, the headline acts are the high core count parts, the ones with a high-frequency or the most expensive models. Of course, any manufacturer that has a high performing halo product will want that story out of the door on day one, but for typical user sales, it is the mid-range that is more relevant. The Intel Core i3 line comes without any Turbo, offering a flat frequency at load, and is synonymous with dual-core configurations with hyperthreading. In this review, we test three of the Core i3 processors, the i3-6100, the  i3-6300  and i3-6320, all of which are set at a 51W thermal design power.

The Skylake Core i3 (51W) Review

Intel’s mainstream desktop processor line, using the latest Skylake microarchitecture, currently sits at 30 different socketable processors. Most of these are available for purchase for system builds, although some of the lower power/specialized parts will be found in OEM systems only or select customers. These processors are subdivided into five ‘families’, with broad ranging feature sets designed to increase as we move through the stack.

Intel's Mainstream Consumer Skylake Product Segments
  Core i7 Core i5 Core i3 Pentium Celeron
TDP Options 35W
Price $303 to
$182 to
$117 to
$64 to
$42 to
Cores 4 4 2 2 2
Hyperthreading Yes No Yes No No
L3 Cache 8 MB 6 MB 4MB: 62/63
3MB: 61/60
3 MB 2 MB
Base Freq 2.4-4.0 GHz 2.2-3.5 GHz 2.7-3.9 GHz 3.4-3.6 GHz 2.3-2.9 GHz
Turbo Freq 3.4-4.2 GHz 2.9-3.9 GHz - - -
DRAM Support DDR4-2133
ECC No No Yes Yes Yes
IGP HD 530 All All but P All but P G45 -
HD 510 - 6402P 6098P G44 All
AVX Yes Yes Yes No No
TSX Yes Yes on 65/66
No on 64
No No No
SGX Yes Yes Yes Yes Yes
MPX Yes Yes Yes No No

The Core i3 line sits in the middle, with two cores and hyperthreading enabled. There are three variants of Core i3 processor: the regular non-lettered models at 51W (e.g. i3-6300), the low power models at 35W (i3-6100T, i3-6100TE) and a single downgraded graphics SKU at 54W (i3-6098P).

The Core i3 processors are the lowest specification of the range to enable AVX 2.0, indicating that AVX is a ‘Core’ feature, over a Pentium or Celeron. Similarly, MPX (Memory Protection Extensions) is only on Core i3 and up. By contrast, transactional extensions are not on the Core i3 models, and are only available on Core i5 and above.

What makes the i3 line a little different to most is the L3 cache variation within the family. Typically the more cache a processor has (or the higher associativity of the cache), and the more cache that a processor has at lower levels, the less important the speed of higher cache/memory levels become. Low levels of cache are typically expensive SRAMs that also take up die area that might be better suited for lower latency logic, hence why we have a tiered cache system rather than just gigabytes of L1 cache.

Core i3 processors either come with 3 MB or 4 MB of L3 cache. This will mean that, as a general rule of thumb, the processors with 4 MB will have to access main memory fewer times, and can hold more data closer to the core logic. This keeps the processors working as much as possible, and should afford obvious benefits in benchmarks where the data cannot fit as easily into cache.

Processors with names that start i3-63xx will have 4MB of L3 cache, whereas the i3-61xx variants only have 3MB, except the Core i3-6100TE which has 4 MB. As confusing as that is, here’s a full table of every LGA1151 socketable Skylake processor released/announced:

Intel's Skylake LGA1151 CPUs
CPUs in Bold have been Tested (some not written up, yet)
  C/T L3 Base Turbo HD HD Turbo TDP MSRP
Core i7-6700K 4/8 8 MB 4.0 4.2 530 1150 91W $339
Core i7-6700 4/8 8 MB 3.4 4.0 530 1150 65W $303
Core i7-6700T 4/8 8 MB 2.8 3.6 530 1100 35W $303
Core i7-6700TE 4/8 8 MB 2.4 3.4 530 1000 35W $303
Core i5-6600K 4/4 6 MB 3.5 3.9 530 1150 91W $242
Core i5-6600 4/4 6 MB 3.3 3.9 530 1150 65W $213
Core i5-6500 4/4 6 MB 3.2 3.6 530 1050 65W $192
Core i5-6400 4/4 6 MB 2.7 3.3 530 950 65W $182
Core i5-6600T 4/4 6 MB 2.7 3.5 530 1100 35W $213
Core i5-6500T 4/4 6 MB 2.5 3.1 530 1100 35W $192
Core i5-6400T 4/4 6 MB 2.2 2.8 530 950 35W $192
Core i5-6500TE 4/4 6 MB 2.3 3.3 530 1000 35W $192
Core i5-6402P 4/4 6 MB 2.8 3.4 510 950 65W $182
Core i3-6320 2/4 4 MB 3.9 - 530 1150 51W $149
Core i3-6300 2/4 4 MB 3.8 - 530 1150 51W $138
Core i3-6100 2/4 3 MB 3.7 - 530 1050 51W $117
Core i3-6300T 2/4 4 MB 3.3 - 530 950 35W $138
Core i3-6100T 2/4 3 MB 3.2 - 530 950 35W $117
Core i3-6100TE 2/4 4 MB 2.7 - 530 1000 35W $117
Core i3-6098P 2/4 3 MB 3.6 - 510 1050 54W $117
Pentium G4520 2/2 3 MB 3.6 - 530 1050 51W $85
Pentium G4500 2/2 3 MB 3.5 - 530 1050 51W $75
Pentium G4400 2/2 3 MB 3.3 - 510 1000 54W $64
Pentium G4500T 2/2 3 MB 3.0 - 530 950 35W $75
Pentium G4400T 2/2 3 MB 2.9 - 510 950 35W $64
Pentium G4500TE 2/2 3 MB 2.4 - 510 950 35W $70
Celeron G3920 2/2 2 MB 2.9 - 510 950 51W $52
Celeron G3900 2/2 2 MB 2.8 - 510 950 51W $42
Celeron G3900T 2/2 2 MB 2.6 - 510 950 35W -
Celeron G3900TE 2/2 2 MB 2.3 - 510 950 35W $42

Originally Turbo mode was introduced in order to be able to push the frequency of a single core (or two) when the software only uses a small number of threads. This allows for extra performance while still keeping within the TDP of the processor. The Core i3 processors do not have a turbo mode by design: when any of the possible threads are in action, the processor will run the cores at the rated base frequency on the box. This should allow for more repeatable results in benchmarks, as long as background tasks do not interfere with the CPU time of a small number of cores.

The pricing of the Skylake processors is such that moving up from a lower family to a higher family is a sufficient jump in price, and there is no overlap. Moving from a Core i3 to a Core i5 for example, is a minimum $23 (from $158 for a boxed i3-6320 to $182 for the i5-6400) for more cache and more physical cores, albeit with the same number of threads and lower core frequencies.

Core i3-6100TE vs Core i3-6100

Looking at the rear of the processors, the lower power Core i3-6100TE, compared to the others (6100/6300/6320 are all the same), has extra capacitors and transistors on the bottom which presumably assist with lower power operation. As the i3-6100TE has a lower frequency to assist with power consumption, the extra components may help shift the efficiency of the processor to nearer the 35W mode. The T/TE variants are typically slightly more expensive than the standard versions, and part of this may be from the additional hardware required.

Competition and Market

One could argue that the Core i3 line is aimed at bulk system production where fast response times are important but high compute functions such as video editing are not. The Core i3 is often earmarked as a processor for entry level gaming, providing enough horsepower to drive medium graphics cards at reasonable resolutions without being a bottleneck. This becomes important if more game development engines and studios adapt their programming models to go beyond 2-4 threads or cores.

Users coming into the Core i3 arena may be updating from an older machine, or looking at a fixed budget and trying to get bang-for-buck. Going back to entry level gaming and sub-$800 systems, users will pull out the Core i3 as an example. What will be interesting here is to see if that L3 cache difference between the Core i3-6100 and Core i3-6300 will be significant.

On the other side of the x86 fence is AMD’s A10-7000 and FX-8000 processor lines. As the Core i3 processors are available for $117-$158, this fits in with the several AMD options. Some of the AMD options have the recently released and updated AMD CPU cooler, which we reviewed recently in a stock cooler roundup. Based on our extensive testing, this 'free' cooler adds value to the AMD offerings, which is not always apparent in benchmark data or when comparing price for performance.

From AMD’s dual-module APUs with superior integrated graphics:

- A10-7860K at $117, free $30 CPU cooler,
- A10-7890K at $165, free $30 CPU cooler

And AMD’s slightly older FX line with either six or eight threads, but no IGP:

- FX-8350 at $199 (launch price)
- FX-8320E at $147
- FX-6350 at $132

Putting these together gives the following table:

CPU Competition at $115-$150
  Intel Core i3 AMD A10 AMD FX
i3-6100 i3-6300 i3-6320 A10
TDP 51W 51W 51W 65W 95W 125W 95W
Cores/Modules 2 2 2 2 2 3 4
Threads 4 4 4 4 4 6 8
Base Freq 3700 3800 3900 3600 4100 3900 3200
Turbo Freq - - - 4000 4300 4200 4000
IGP HD 530 HD 530 HD 530 R7-512 R7-512 - -
IGP GFLOPs 403.2 441.6 441.6 900.0 1029.6 - -
DRAM DDR4-2133 DDR4-2133 DDR4-2133 DDR3-2133 DDR3-2133 DDR3-1866 DDR3-1866
Released Sep '15 Sep '15 Sep '15 Feb '16 Mar '16 Oct '12 Sep '14
Price (box) $117 $147 $158 $117 $165 $132 $147

The FX parts, with more threads, have the deficit of being substantially older parts based on AMD’s Steamroller microarchitecture, while all the AMD parts suffer in terms of power consumption. However, for the extra TDP, there’s an uptick in integrated graphics for the APUs. Also, the AMD parts suffer a noticeable single thread performance deficit, so it will be interesting to see how this plays out on our benchmark suite.

As part of a series of reviews this quarter, we have recently retested a small number of FX processors, as well as the newer A10 processors. The data for these is available in our benchmark database, Bench.

CPUs in this Review

For this review we have tested the Core i3-6100, Core i3-6300 and Core i3-6320 processors from Intel. This builds on our review of the Core i3-6100TE, where we explored overclocking on Core i3. As was apparent in that review, trying to get a motherboard with an older microcode to allow overclocking on a Core i3 is somewhat difficult, and results were not over the moon, so we won’t be producing overclocking numbers for these parts here (and I might have broken the OC motherboard accidentally trying some out-of-the-box thinking).

Intel Core i3-6320

Intel Core i3-6300

Intel Core i3-6100 (with lower L3 Cache)

Nonetheless, the landscape for Core i3 should be very interesting. We put these CPUs through our long-form CPU 2015 tests, including our Real World, Office and Professional tests, while the 2016 suite is still being built. The CPUs were also used with five high-caliber gaming titles, with low, mid and high-end GPUs. We then end with the final countdown analysis. Any of the links below will jump straight to the respective page.

Pages In This Review

Skylake Core i3 (51W) Analysis
Test Bed and Setup
Benchmark Overview

Stock Comparison: Real World
Stock Comparison: Office
Stock Comparison: Linux
Stock Comparison: Legacy

Gaming Comparison: Alien Isolation
Gaming Comparison: Total War: Attila
Gaming Comparison: Grand Theft Auto
Gaming Comparison: Grid Autosport
Gaming Comparison: Shadow of Mordor

Conclusions and Final Words

Test Bed and Setup
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  • Morawka - Monday, August 8, 2016 - link

    It's still suprising to see it on a low end CPU. i didnt know the i3's had ECC, now i'm thinking of building a FREENAS box off of one of these
  • Samus - Tuesday, August 9, 2016 - link

    You'd be surprised how many servers actually ship with i3's...those HP ML10's are incredibly common and I've seen a number of Lenovo SMB servers run i3's.

    The i3 is more than adequate for most small business servers unless they plan to run Hyper-V. Most other CPU intense services are cloud-based now (I personally think a business is crazy to maintain their own exchange server these days when Microsoft offers a $4/month/mailbox turn-key solution)

    Basically all servers do now is run the domain and a few basic services like file sharing and routing. SQL, Exchange, even Hyper-V are all inexpensive Azure\Office365 services. It really comes down to who costs more, your IT guy, or Microsoft. Odds are, the IT guy. Unfortunate because I am one.
  • jardows2 - Monday, August 8, 2016 - link

    Low end consumer CPU's. Intel likes the product segmentation between Xeon's and i5/i7. This is also why Intel forced the use of the "c" series chipsets for the Xeon processors. a Xeon E3-1240 v5 is about $30.00 cheaper than an i7 6700, with a higher base frequency, but slightly lower turbo frequency.

    Of course, this helps people who are wanting server grade, but only need low end processing power. A Pentium or an i3 would be a great home server chip, but i5 or i7 overkill. If you are wanting to use a higher-end production computer with ECC, you probably are looking at higher-end processors than i5 or i7 anyway.

    However, AMD includes the support in all their AM3+ processors, and I believe in all their FM2 processors as well. Not every motherboard supports it.
  • sheh - Monday, August 8, 2016 - link

    Yes, I was referring to non-server CPUs.

    But why is it on the i3? Not that I mind, but the surprising aspect and the problem is that it's not on i5 and i7.
  • Black Obsidian - Monday, August 8, 2016 - link

    jardows2 covers that in his/her product segmentation reference.

    If you want ECC on the low end, Intel is happy to sell you an i3. If your needs are any higher, Intel wants to push you towards a Xeon (and C-series chipset), which IIRC are higher-margin parts than the i5 and i7, and happen to have gone through additional server-related validation.
  • satai - Monday, August 8, 2016 - link

    I understand this concept but I still don't get why there are cheap ECC enabled i3s instead of more expensive (but still cheaper than 4C Xeons) dual-core Xeons...
  • extide - Monday, August 8, 2016 - link

    Yeah, that is kinda weird, you would think Intel would do that, and create even more segmentation, which is something they definitely tend to like to do.
  • rhysiam - Monday, August 8, 2016 - link

    My guess would be (and full disclosure... this an educated guess): at some point the market becomes too niche and the higher profit margins get lost to the additional costs of segmenting product lines, keeping different lines in stock, etc. The cheapest Xeon quad core on Newegg is already only $90 more than the cheapest i3. How much more could Intel actually charge for a dual core Xeon over the i3, the only benefit of which is ECC? Then they'd have to maintain a whole new product line, manage stock levels, etc. My guess is that for the relatively small number of customers pairing a dual core with ECC memory, it's just more trouble than it's worth.
  • satai - Tuesday, August 9, 2016 - link

    Thet sounds like a believable explanation.
  • DanNeely - Monday, August 8, 2016 - link

    What exactly is the point of the Core i3-6098P supposed to be? Compared to the equally priced I3-6100, it's slower, has a weaker GPU, and a higher TDP. On paper I can't see any reason to buy the former instead of the latter?

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