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When a computer is at "idle" there are still processes going on that are going to use a small part of CPU time. The way Ryzen is designed and Windows 10 is programmed the CPU is allowed to switch clocks and voltages much more rapidly than before, which means it can spend more time in a lower power state (and therefore cooler), kick up for a second or two into a turbo frequency which increases the heat by 10°C or so, and then drop back down.
As for RAM, Ryzen is very picky about which RAM it uses correctly. Corsair has a list on their website for Ryzen compatible modules.
I'm not exactly seeing my exact RAM on they're site but they do list the (2 x 8GB) DDR4 DRAM 3000MHz C15 Memory Kit (CMD16GX4M2B3000C15) which I would assume is just like mine only I have 2x16gb cards instead but the SAME speed. It sounds like from what most are saying that speed jumps and temps are normal so I guess I shouldn't worry too much, Just wanted to see what others thought of this or if they had this same situation and if it needed to be handled.
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Your description of the CPU speed and temperature changes seen in Ryzenmaster is completely normal, and is what you should be seeing. There is nothing wrong.
Even if you are not doing anything on the PC, Windows is constantly doing things, and putting various loads on the CPU while performing different tasks in the background. Modern processors heat up and cool down quickly with changing loads, and the temperatures you listed are not at all high.
About your memory, we use DDRx memory, which mean Double Data Rate. Whatever the true memory frequency is, like 1,500MHz, the actual memory speed is double that, or 3,000. Corsair link is simply reporting the memory frequency, not the actual resulting memory speed. Actually, the correct units for memory speed is Mega-Transfers per second (MT/s), since the resulting DDR speed is not really a frequency. If someone does not understand the relationship between memory frequency and memory speed, then they may be setting the "speed" of their memory incorrectly in the UEFI/BIOS. The result of that can be a pain, but is just their mistake.
There is no problem with setting memory speed in the UEFI/BIOS of your ASRock board. You probably heard about the early UEFI/BIOS versions used with Ryzen mother boards. Ryzen processors were released before all the work on the UEFI's were complete, and AMD is still providing new versions of the Ryzen processor microcode to mother board manufactures (called AGESA updates), that are a part of the UEFI/BIOS files. All mother board manufactures were affected by this.
It sounds like your board has an early UEFI version in it, with the older AGESA 126.96.36.199a version, if you cannot select a memory speed of 3000. That AGESA version did not support a memory speed of 3000, and instead it would be set to 2933 automatically. AMD's AGESA 188.8.131.52 update added support for more memory speeds, including 3000. I'm sure there is a UEFI update with the latest AGESA version 184.108.40.206b for your board, if you are interested.
Some advice for the first time PC builder. If you think something is wrong, check into it thoroughly before deciding it is wrong and an issue exists. Until you have a few years of experience building PCs, your knowledge base is simply incomplete. Everyone experiences this.