Intel i7-7740X CPU Rewatch vs. 7700K, 7900X, R7 1700, & MoreP2: CPU Testing MethodologyP3: Intel i7-7740X Thermals Stock & OverclockedP4: Intel i7-7740X FPS & FireStrike Benchmarks

We asked Intel why Kaby Lake-X exists at its current push day, difficult that the refreburned 7700 & 7600 CPUs can’t be provided on LGA1151 sockets, that they aren’t substantially different from the precursors, and also that LGA2066 boards are way more expensive. The socket and also chipset alone have a higher BOM expense for manufacturers than 200-series boards, and that expense is passed on to consumers. That’s not totally free. The consumer also pays for the components that won’t go unused, choose the map routing for half of the DIMMs (and the physical slots).

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But Intel gave us a response to that query.

Why Does Kaby Lake-X Exist?

Getting into this thing, Intel’s answer to our query of why Kaby Lake-X exists was this: Kaby Lake X, Intel shelp, permits consumers to gain into the Extreme Series platcreate at a reduced price and usage it as an entry-level. Someone can buy the i7-7740X ($350) or i5-7640X and then upgrade it later to among the Skylake X CPUs.

That’s their answer.

We think this is a little misguided in its thinking. Here’s the thing: If you’re spfinishing $330 on a CPU anymethod, and you’re spending just as a lot or even more money on the motherboard, then there’s a difficulty if the ultimate goal is to relocation the CPU later. Once you’re $600 into a construct via simply the board and also CPU, you really can as well stop pretfinishing and simply go properly high-end or obtain a Z-series board. This isn’t even a mid-step – it’s high-finish boards all the means down, and also then this weird CPU that, on an HEDT platform, is thought about low-finish. Relative to the motherboard, that’s just how it’d look. That’s specifically true for the i5, which plainly shouldn’t exist. The i7-7740X also is of questionable existential worth, as we’ll show today.

More realistically, we think that Intel is trying to work toward merging its high-end enthusiast products. By 8th generation, we wouldn’t be surprised if we view the 7700K ($330) identical chips move permanently to X-class hardware, at least, if there’s not enough push-ago.

But that answers why Intel thinks Kaby Lake-X exists, and of course shows that we don’t necessarily agree, if only bereason it’s confusing for finish users.

Intel i7-7700K vs. i7-7740X Specs Differences

As for the distinctions in between the 7700K and 7740X, here’s a chart that reflects them:

Socket TypeLGA1151LGA2066
Base Frequency4.2GHz4.3GHz
Max Turbo Frequency4.5GHz4.5GHz
Bus Speed8GT/s8GT/s

Don’t look also hard. It’s the base frequency – the 7740X climbs to 4.3GHz from 4.2GHz, with increase at 4.5GHz on both. They’re still using a dual-channel memory controller, so just 4 DIMMs are usable on the board, and they’re still both limited to 16 PCIe lanes on the CPU itself.

The last major distinction is the socket kind transforming, forcing potential 7740X customers to spfinish even more on X299 so that they can go on to use half of its functions.

There’s an additional massive difference: the IGP is rerelocated. An IGP on the i7 K-SKU CPUs has actually always been of questionable value, but it’s at least useful for troubleshooting. That’s about it. Here’s the point, though – if it exists currently on the 7700K silsymbol, which is clearly the exact same stuff offered for the 7740X, there’s no factor to suddenly rerelocate it. Besides, this counters Intel’s own dispute. Their discussion is that the 7740X is a CPU you buy to upgrade later on. Well, if you’re currently in the boat of being able to oddly afford an i7 and X299 board but not a Skylake X CPU, you could also be in the odd boat of utilizing the IGP and also upgrading the GPU later.

But you can’t execute that here.

It’s not favor we’re fans or individuals of the IGP, yet if Intel is going to have it at all on the S-series i7s, we’d prefer them to be continuous via it.

X299: The Platdevelop of Clarification


Since Intel is mixing what is successfully a K-SKU part with X-class HEDT parts, the platform gets confmaking use of in its assistance. Half the DIMMs, for instance, cannot be offered via the i7-7740X. Buying a motherboard through 8xDIMMs and installing an i5 or i7 KBL-X CPU will certainly limit memory to 2 channels, which suggests four DIMMs.

PCIe lane limitations deserve to likewise come right into play, though the relevance of this hinges strongly on customers via heavy IO use cases. The KBL-X CPUs still run x16 PCIe lanes directly, pushing the remainder out by means of DMI and the PCH. This suggests that high drive-count configurations that lean on NVMe protocols or PCIe lanes will be limited sooner than Skylake-X.

If truly planning to upgrade from KBL-X to SKY-X, for some factor, it’d also be necessary to factor-in power usage. SKY-X deserve to push 1.8-1.9Vcore, whereas KBL-X draws closer to the 1.18-1.4 selection (through OC & OV) of Kaby Lake. This implies you’d want to be cautious about power supply selection, as an overclocked SKY-X part will attract in the thousands of watts. We have sepaprice testing coming for that, though.

Regardmuch less, let’s obtain into this testimonial with thermals initially, then gaming and fabricated tests.

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Continue to the next page for CPU experimentation methodology.


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