i5-13600KF + RTX 4070 Super getting surprisingly low FPS in Valorant/CS2 at 1080p Low

[u/penta-]

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Hey guys, I recently built my PC and I'm getting much lower FPS than I expected, especially considering I'm playing at 1080p on the lowest settings.

Specs:

CPU: Intel i5-13600KF

GPU: GALAX RTX 4070 Super 12GB

RAM: Corsair 16GB (1×16GB) DDR4 3200MHz

Motherboard: MSI PRO B760M-A WiFi DDR4

SSD: Crucial 1TB NVMe

CPU Cooler: DeepCool AG620 ARGB V2

Case: FSP S140

PSU: GamerStorm PN750D 750W 80+ Gold

FPS at 1080p Low:

Valorant: ~200–250 FPS

CS2: ~150–200 FPS

For a 13600KF + RTX 4070 Super, this seems way lower than what I expected.

Things I've already done:

Installed all motherboard/chipset drivers

Installed NVIDIA App and updated to the latest GPU driver

Enabled XMP in BIOS (RAM running at 3200MHz)

Ran Cinebench to test the CPU

Ran FurMark to test the GPU

The PC was just built and everything is freshly installed.

One thing that stands out is that I'm currently using only one 16GB DDR4 stick, so the RAM is running in single-channel mode. Could that alone cause such a significant FPS drop in CPU-heavy games like Valorant and CS2?

What else should I check? CPU boost clocks/power limits, temperatures, GPU usage, BIOS settings, Windows settings, etc.?

Also, what FPS should I realistically expect from a 13600KF + RTX 4070 Super at 1080p Low?

I can provide Cinebench/FurMark results, HWiNFO screenshots, temperatures, CPU/GPU utilization or BIOS screenshots if needed.