Normal range for Skylake voltages/temperatures, XMP settings

[doppeldanger]

Just purchased a shiny new Skylake (6700k) system, haven't really played with overclocking since the days of the Core 2 Quad Q6600 and the i7 920. Got a DDR4 memory kit specced for 3400MHz / 16-18-18-38 @ 1.35 volts (G.Skill TridentZ F4-3400C16D-16GTZ), 4x8GB (2 DIMMs per channel). Turning on XMP sets the RAM to the settings above, but the idle (just in the BIOS screen) CPU Voltage goes from 1.272V to 1.346V and idle temps jump by 10c (26-27c to 36-37c). Is this normal?

I'm rusty when it comes to OCing and general system tweaking, but I'm certainly no novice. Still, changes of that magnitude just from enabling XMP triggered some alarms. If this isn't normal, any tips about what might be going wrong?

Full system specs are as follows; everything is still at stock.
CPU: Intel Core i7 6700k
CPU Cooler: Corsair H80i V2
Motherboard: GIGABYTE G1 Gaming GA-Z170X-Gaming 7
Memory: G.SKILL TridentZ Series F4-3400C16D-16GTZ (2x 16GB kits)
Video Card: GIGABYTE GeForce GTX 960 4GB Mini ITX OC EDITION
Storage: 1x Samsung 850 EVO M.2 SSD 500GB, 2x Seagate ST4000DM000 4TB HDD
PSU: SeaSonic Platinum SS-860XP2 860W
Case: Lian Li PC-TU300A

 

[BonzaiDuck]

Where did you get the reported voltages or voltage range? Which CPU-monitoring software?

I've yet to move up to a 6700K, but the plan is "being hatched." Only from what I'd seen second-hand, the voltages seem higher than they might be, but still within a "safe" range for the Skylake die-shrink.

Check the Intel specs.

Also, the idle temperatures. If your room-ambient Fahrenheit is ~75F, those would be quite acceptable as idle temperatures. They could be better. It depends on the cooler.

I have seen someone -- WGusler, who shows up here from time to time -- use an H80i or similar cooler, with (possibly) some Noctua iPPC 120's or 140's, tightly ducted to the rear of a Corsair Vengeance C70 case. I think he was building a Haswell-refresh or Devils Canyon i7-4790K system. When he was finished installing some 140mm intake fans for the C70, the temperatures were really quite competitive. You could search the Anand thread-stacks or archives for "AND-ing" the WGusler and C70 strings.

Personally, I've hardly examined the OC'ing and temperature limits for the Skylake. I'm "that far" behind the times.

However, now that I think of it, the trend with the Intel quad-K's has followed a downward adjustment in voltage before finalizing an upward adjustment in clock-speed. Anyone can confirm or deny . . . . chime in as inclined.

 

[Majcric]

3400MHz / 16-18-18-38 when you enable the XMP profile is most likely raising your BCLK to somewhere in the 102xx range. system agent and vccio are also being supplied with more voltage. in short, this means your system is already pushed hard and the i7 6700oc will be minimal.

You can try to manually fine tune everything. Or you can do like I did and swap that ram for some 3000mhz@15-15-15-35. Then simply change the multipier and tweak your vcore for the i7 6700k overclock

 

[BonzaiDuck]

That's interesting . . . As I said, I was going to build one of those 6700K's.

 

[VirtualLarry]

Some mobos enable some sort of auto-OC (like MCE - multi-core enhancement) when you enable XMP.

 

[Soccerman06]

My 6700k is running at 1.31v at 4.6ghz with some corsair 2800mhz ram (dont remember what kind) and idles at 20-25c (room is 16-18C) with a H110i GT, somewhere in the 50s at load.