Overclocking With The Ryzen 7 1800X
With so many cores in the system we cannot resist overclocking. We're keeping things relatively simple. We need to take a couple of steps if we want to overclock. First tip, always invest in good hardware by the way (MOBO/PSU/Memory/Cooling), the cheaper motherboards often are not well tuned for enthusiast overclocking. Also get yourself a good power supply and proper processor cooling. Overclocking with any 8 or more core processor (doesn't matter if that is Intel or AMD) is far more difficult than you expect it to be. Both brands end in the 4.2, maybe 4.3 range, again that is similar with Intel processors as well.
A bit of a mess, but that's what an overclocking table should look like ;-) We use the new Ryzen compatatible EK Predator 240 here.
Overclocking 8-cores on a high clock frequency is a tough job, but can be managed relatively easily from the BIOS. You can also use AMD's software tool of course. The Ryzen 7 1800X has a base clock of 3.6 GHz and a boost frequency of 4.0 GHz. During our measurements by trial and error we found that at 1.375~1.425 Volts you will end up at roughly 4.1~4.2 GHz (that is on all eight cores!). And yes, that is not a lot over the default Turbo, but again this is 8-cores!
The Guru3D reader-base overclocks mostly from the BIOS to try and find the maximum stable limit. The generic overclock procedure for multiplier based overclocking is as follows:
- Leave base clock (bus) for what it is right now (100 MHz)
- Set the per core multiplier at a maximum of your liking:
- Example 1: 100MHz x 42 = 4200 MHz
- Example 2: 125MHz x 33 = 4125 MHz
- Increase CPU voltage; though setting AUTO should work fine. Start at 1.350 volts and work your way upwards into a state of equilibrium in perf and cooling temps.
- Make sure your processor is properly cooled as adding voltage = more heat
- Save and Exit BIOS / uEFI
Now, with the ASUS motherboards you'll have tweaked options available at the press of a button. To set the processor to 4 GHz (all 8-cores) just go to the Extreme Tweaker menu and select your profile. You can now hit save and exit and you are done. Basically this just sets the multiplier at 40 and disables XFR etc. This setting was 100% stable.
Ryzen likes memory bandwidth, so with this dual-channel setup we really can recommend higher frequency memory like the 3000 MHz kit used. Most motherboard partners will label this as XMP, but since that is an Intel branded name for pre-defined SPD memory profiles just go to the Ai overclock tuner and select a D.O.C.P stage. Standard will activate the memory tweak at close to 3000 MHz.
Once you've applied this your DIMM voltage should have increased to 1.35 Volts (if not set it manually as we really can recommend that as stable voltage). You can also find the recommended DDR4 voltage on the sticker of your DIMM modules alongside all optimal timings.
Also in DRAM timing control you will notice the most important memory timings preconfigured. If your memory should not be compatible, you can of course simply enter them manually as well and not use the D.O.C.P profile.
Now... have a peek at the screenshot below:
With the limited time available we tried some overclocking. We can boot into Windows and run a simple test at 4200 MHz just fine. Yet we need additional tweaking to be 100% stable and to be able to benchmark intensively. We dropped to 4.1 GHz on all eight cores. With the ASUS board we can advise you to leave CPU voltage at AUTO. With the EK PRedator 240 Liquid cooling kit we hover in the 65 Degrees C range under full load.
Our ease of overclocking tip: in our findings the more widespread, stable and acceptable overclock is 4.1 GHz on all 8 cores with voltage set to auto. This does apply to the ASUS HERO motherboard we used. That number seems to be the sweet spot that I'd like to recommend to you. Overclocking however always varies per system, PC, ASIC quality, cooling and sure... a bit of luck as well.
Back to that tweak; adding that some extra voltage on the CPU for the OC also has an adverse effect on the overall energy consumption. Under stress and overclocked we all of a sudden use roughly 200 Watts under full processor load. That is power consumption for the whole PC measured at the wall socket side including a GeForce GTX 1080 in idle and the Predator 240 liquid cooling kit (yes pumps and fans eat power as well). All characteristics we observe, measure and see look pretty similar to the 8-core 6900K in terms of heat, power consumption and clock frequency wise.