Core i7 8700K OC at 4800 MHz 1.3 volts

Core i7 8700K OC at 4800 MHz 1.3 volts

1.3 V and higher voltages can cause serious problems for Coffee Lake CPUs because of the TIM used under the heat spreader (instead of a solder like in the Sandy Bridge range). Our (delidded) Core i7 8700K was set @ 4800 MHz, at 1.3 volts. Again, wPrime 2.10 (3 times 1024 M) has been used. IDLE temperature measurements are taken in the desktop modus operandus, with almost no stress to the CPU.

The temps shouldn’t go beyond 90°C, as otherwise the CPU might degrade and also throttling can occur (especially applicable to the AMD Ryzen range, which normally operates at lower temperatures). AIO coolers perform very well with our delidded Core i7 8700K. The ROG Ryou 240 and Ryujin’s did very well. Let’s try it with a voltage higher than 1.3 V. 

Core i7 8700K OC at 4800 MHz beyond the 1.3 volts

 There are five stages for the charts below:

• Default
• 4.8 GHz @ 1.3 V
• 4.8 GHz @ 1.35 V
• 4.8 GHz @ 1.4 V
• 4.8 GHz @ 1.45 V

First up is the strongest of the pack, the Asus ROG Ryujin 360.

Then – its smaller, 240 mm brother.

All of the Asus AIOs managed to keep the CPU temperatures under control until 1.4 V. At 1.45 V the temps went north of 80 degrees Celsius (even with the Ryujin 360), but the final result is still good and most users will not find this an issue.