Aytug Yayman

Software developer · C# / .NET · React

I write Windows tools for AMD Ryzen processors. I also develop the ERP system a freight company uses every day.

Here I write about my projects and the problems I ran into while building them.

C#Developer.cs

namespace AytugYayman; public sealed class Developer{    public string Name => "Aytug Yayman";    public string Role => "Software Developer";     public string[] Stack =>        ["C#", ".NET", "WPF", "React"];     public string[] Focus =>        ["Ryzen", "DDR5", "SMU"];     // TODO: ship ZenStation v1.0}

About

My name is Aytug Yayman. On the desktop I work with C# and .NET, on the web with React, TypeScript and Node.js.

Most of my time in the last few months went into AMD Ryzen processors. I maintain a fork of ZenTimings, and I'm writing ZenStation, an app that puts the usual monitoring and tuning tools into one window. Much of this work happens in places that aren't documented, mainly SMU messages, PM tables, memory controller registers, and the APOB data the BIOS leaves in memory at boot.

When I find out where a value lives, I send it upstream as well. Some of my changes to ZenTimings and ZenStates-Core have been accepted.

I develop and test ZenStation on a Ryzen 5 3400G with DDR4 memory. On the web side, I work on the ERP system of an international road freight company. Trips, customs, vehicles and accounting all run through it.

What I work on

Hardware access
SMU mailboxes, MSR, SMN and CPUID registers, PM tables
Memory
DDR4 and DDR5 timings, SPD, impedances, latency and bandwidth measurement
Desktop
C#, .NET 8 and WPF, signed auto-update
Web
React, TypeScript, Node.js and Express, SQLite and PostgreSQL

Projects

I'm working on three projects at the moment. Each one has its own page with the details.

ZenStation.csPrivate repo · coming soon

Windows · AMD Ryzen monitoring and tuning

ZenStation

An AMD Ryzen monitoring and tuning app for Windows. It shows clocks, temperatures, power and memory timings, can change limits and clocks, and tests whether the result is stable. Before it writes anything to the processor, it lists exactly what it will write and asks you to confirm.

Tech stack

C#
.NET 8
WPF
PawnIO
ZenStates-Core
LibreHardwareMonitorLib

Project page

The source is private for now. I'm preparing the first release. License: GPL-3.0.

What's in it

Live clocks, temperatures, voltages and power, with ten minutes of history
DDR4/DDR5 timings read from the memory controller, and module SPD data
Power limits, Curve Optimizer, P-state editing and profiles
Stress test and WHEA hardware-error monitoring

ZenTimings.csOpen source · GPL-3.0

Fork of irusanov/ZenTimings · v1.40 → v1.44

ZenTimings (fork)

A fork of irusanov's ZenTimings. I added live sensors, a memory and cache benchmark, and reading of the tCCD_L timings on DDR5. I released ten versions in July and August 2026.

GitHub releases: 10
commits: 18
lines added: 17,691

Tech stack

C#
.NET Framework 4.8
WPF
ZenStates-Core

Project page View on GitHub Releases

What's in it

tCCD_L, tCCD_L_WR and tCCD_L_WR2 read from the APOB
A benchmark that shows speed and latency of L1, L2, L3 and RAM in one table
A view with all memory channels side by side, also merged upstream
Turkish user interface

BestFreight.tsxIn-house · in production

Logistics ERP · web application

BEST Freight ERP

A web-based ERP I develop for an international road freight company. The office team runs trips, customs declarations, vehicles and accounting through it.

Tech stack

React 19
TypeScript
Vite
Tailwind CSS
TanStack Query
Node.js
Express 5
SQLite
PostgreSQL
Socket.IO

Project page

In-house software. I don't share its source code, screenshots or any company data.

What's in it

Import and export trips, CMRs and other documents
NCTS, GVMS/GMR, CDS and ICS/ENS customs integrations
GPS vehicle tracking and tachograph data
Accounting, trip profitability and e-invoicing

Open-source contributions

Changes I sent to other projects, or that were made after I reported something. Newest first.

21 Sept 2026irusanov/ZenStates-Corecommit
I noticed that some PM table offsets were shifted. irusanov updated the table and thanked me in the commit.
05f9100 (irusanov/ZenStates-Core, opens in a new tab)
19 Sept 2026irusanov/ZenTimingsmerged PR
A view with the timings of all memory channels side by side, and a read-only debug report window.
#106 (irusanov/ZenTimings, opens in a new tab)
17 Sept 2026irusanov/ZenStates-Coremerged PR
Code that reads the report version, core count and per-module timings from debug reports.
#27 (irusanov/ZenStates-Core, opens in a new tab)
4 Sept 2026irusanov/ZenStates-Corecommit
The APOB layout for the Zen 5 APU extended block and CCDL (tCCD_L) was corrected. The commit thanks me.
f8dce5b (irusanov/ZenStates-Core, opens in a new tab)
16 Aug 2026deadfellow34/ZenTimingsreleases
Ten releases on the fork. The changes of each one are in the changelog on the ZenTimings page.
v1.40 → v1.44

Skills

The languages and tools I use, and the areas I work in.

"languages": C#
TypeScript
JavaScript
SQL
"desktop": .NET 8
.NET Framework
WPF
MVVM
"hardware": AMD SMU
MSR / SMN / CPUID
PM tables
APOB
DDR4 / DDR5
SPD
WHEA
"web": React
Node.js
Express
Vite
Tailwind CSS
TanStack Query
Socket.IO
"data": SQLite
PostgreSQL
"tools": Git
GitHub
pm2
macOS
Windows

Contact

You can reach me on GitHub or X.

If a value in ZenTimings looks wrong, two debug reports, one taken before changing the setting in the BIOS and one after, make the problem much easier to find.