CPU Reviews System

X299 Ultra-Light: Intel's Kaby Lake-X Core i7-7740X, Core i5-7640X and what to do

We want to precede today's test with a small episode that we experienced at a motherboard manufacturer when it came to Intel's request that kaby Lake-X still have a cheap board with only four memory banks. The Basin Falls X299 chipset The Kaby Lake-X processors sit in an LGA2066 socket (R4), powered by an X299 chipset with 6 watts of power consumption. The 14nm chiset supports an x4 DMI 3.0 connection, which provides a PCIe link between the ... What we noticed during testing We took a little more time to counter some of the anomalies we noticed when benchmarking the new Kaby Lake-X CPUs. To what extent the 3DMark is now really a reliable reference... Ashes of the Singularity: Escalation (DX12) Let's take the bow to the first game, which we have documented in as much detail as always. Purely in terms of computing power, there are no surprises and all CPUs are also fixed in time... Project Cars (DX12) This game demands the CPUs, but you don't actually need more than 4 real cores. Here, only clock counts and thus also the IPC. The Core i7-7740X can be overclocked and not overclocked. In... Introduction During the launch article of AMD's Ryzen 7 CPUs, we had already explained all workstation and HPC benchmarks in great detail and also questioned the background for many results in some cases even down to the last detail. En... Important preliminary remark As with Kaby Lake, Intel has no longer realized the contact between Die and Heatspreader by metallic solder at Kaby Lake-X, but is also available here on cheaper TIM (Thermal Interface material, i.e. neat heater... Cooling with the Chiller crowbar In order to achieve comparable results for the launch article of the Core i7-7900X, we use the Alphacool Ice Age Chiller 2000, as with all articles on AMD's Ryzen, which also has a load-independent, constank... Summary The bottom line is that the performance differences between Kaby Lake and Kaby Lake-X are rather marginal, but we haven't really found the meaning of this whole venture either. While the Vi...

Cooling with the Chiller crowbar

In order to achieve comparable results for the launch article of the Core i7-7900X, we use the Alphacool Ice Age Chiller 2000, as with all articles on AMD's Ryzen, which also enables a load-independent, congested water temperature of 20°C. Thus, the determined values are comparable to all these reviews, which of course also allows interesting conclusions about the extent to which Intel's new CPUs suffer from the USED TIM (heat conductive paste) or to what extent. negatively affected by it.

High Delta Values

This is again due to Intel's inappropriate (but arguably much cheaper) thermal paste, rather than a sensible solder.  In order to be able to correctly classify the worse circumstances due to the thermal paste used, we now show the temperature differences between the constant 20°C cool water block and what we have determined as CPU temperature from the sensor values.

The following curve shows extremely clearly that the waste heat can only be dissipated poorly and insufficiently. We also measured the temperature of the heatspreader using our own, very thin copper plates analogous to the Ryzen and Core 9 launch articles, whereby the delta determined here is later included in our individual curve. Let's first compare the Core i5-7640X with the Core i7 7740X in terms of temperature differences:

At the end, the following curve thus represents the temperature differences between the heatspreader top and the computational cores of the two CPUs, which also have very similar curves.

Although with our Chiller, the Alphacool XPX water block and the Thermal Grizzly Kryonaut thermal paste we have used pretty much the best and most expensive that the market has to offer, at the end 38 and even 48 Kelvin as a temperature difference between the temperature of the cores and the top of the heat spreader on the calculation. This is not highly dramatic, but it is quite annoying because it is unnecessary.

Leakage

We measured the power consumption values at identical loads and different cooling solutions. The amount of leakage currents that can be measured, or rather what could have been thought of, was below the measurement tolerance and we therefore also dispense with a digram. Both CPUs therefore do not suffer from temperature-dependent leakage currents, which could lead to a significant increase in power consumption.

Intermediate conclusion

Yes, it could have been a little nicer with Kaby Lake-X, wasn't there, as with Kaby Lake, the annoyance with the thermal paste between Heatspreader and Die. Well, the normal user will be able to live with it, but it drives up the costs for the user, who in any case has to buy a decent cooler.

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About the author

Igor Wallossek

Editor-in-chief and name-giver of igor'sLAB as the content successor of Tom's Hardware Germany, whose license was returned in June 2019 in order to better meet the qualitative demands of web content and challenges of new media such as YouTube with its own channel.

Computer nerd since 1983, audio freak since 1979 and pretty much open to anything with a plug or battery for over 50 years.

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