u/amatiil24

I’m looking to replace my current desktop and I’m stuck between going AM5 with something like a Ryzen 9 9950X3D, or staying Intel with a Core Ultra 9 platform.
I’m not looking for a pure gaming build and I’m not trying to chase benchmark numbers for the sake of it. This is my main PC and I use it every day for both work and gaming, so reliability and day-to-day behaviour matter a lot to me.

Current system
Intel i9-9900K
Gigabyte Z390 AORUS Ultra
32GB DDR4
RTX 5070
1440p 180Hz monitor

The current machine has been extremely stable. One thing I particularly like is that it boots very quickly and basically never gives me trouble. I don’t want to spend A$3k+ on a replacement and then deal with random memory issues, long POST times, BIOS problems, sleep/wake problems, USB weirdness, or having to tune voltages/settings just to make it reliable.

What happens to the current PC
The 9900K/Z390/32GB system will become a home server/NAS rather than being sold.
None of the current CPU/platform needs to carry over to the new desktop except the RTX 5070 which will move to the new PC.

New PC budget
Roughly A$3,000–3,500 excluding the GPU.
I’m happy to spend less if there’s no real benefit to using the full budget.
I’ll probably aim for 64GB RAM if Australian DDR5 pricing allows it, otherwise 32GB initially.

My actual workload
Productivity probably edges gaming slightly. Some of these workloads will move to the old PC, however, I see me doing a lot of these on the new machine too.
On the productivity side:
- software/web development
- IDEs
- lots of browser tabs/apps simultaneously
- WSL / Docker
- local development databases
- AI coding tools
- general heavy multitasking
- occasional photo/video/media work
I’m not doing professional 3D rendering all day, but I do want plenty of CPU headroom and I tend to keep machines for a long time.

Gaming is still important. I have an RTX 5070 and play at 1440p / up to 180Hz. If a new AAA game comes out, I want to be able to run it at high/ultra settings without feeling like I built a workstation that happens to be bad at games.

The two directions I’m considering

AMD
Ryzen 9 9950X3D
X870 / X870E motherboard, probably Gigabyte
32GB/64GB DDR5
Potential advantages as I see them:
- excellent gaming performance
- strong multi-core productivity performance
- AM5 upgrade path
- lower gaming power consumption
- arguably the best compromise between workstation and gaming performance

What concerns me:
- AM5 memory training / POST behaviour
- EXPO stability
- BIOS/AGESA dependence
- sleep/wake quirks
- reports of people needing to tweak RAM or BIOS settings
- dual-CCD scheduling/core parking on the 9950X3D

I know a lot of these issues may be historical or exaggerated, which is exactly why I’m asking people actually running these systems now.

Intel
Core Ultra 9 platform
Z890 motherboard, likely Gigabyte
32GB/64GB DDR5

Potential advantages as I see them:
- strong productivity performance
- Quick Sync
- lots of cores for multitasking
- I’m familiar with Intel platforms and have had excellent stability from my current system
- potentially less concern around AM5-style memory training/EXPO quirks

Downsides:
- weaker gaming performance than the X3D CPUs
- less attractive platform longevity
- higher-end Intel doesn’t appear to clearly beat the 9950X3D in the workloads that matter to me

What I actually want to know
I’m particularly interested in answers from people who have actually owned or built recent AM5/X870 systems and/or Core Ultra/Z890 systems, not just people repeating benchmark charts.

Specifically:
- If you use AM5 daily for work, is it genuinely stable now?
- Are long memory-training boots still a real everyday problem, or mostly a first-boot/BIOS-change thing?
- Is EXPO at something sensible like DDR5-6000 generally set-and-forget with 2 DIMMs?
- Have you experienced sleep/wake, USB, networking, Bluetooth or random WHEA issues?
- For people with a 9950X3D, have the dual-CCD/game scheduling issues actually caused problems in real use?

For Core Ultra 9 owners, has the platform been genuinely more trouble-free, or is that assumption outdated?
Given that productivity is slightly more important to me than gaming, would you still choose the 9950X3D?

If you had A$3–3.5k excluding GPU and intended to keep the machine for 5+ years, which platform would you choose?
I’m not opposed to AMD. I’m trying to separate genuine current platform problems from old AMD reputation.
My main requirement is simple: fast, powerful and boringly reliable. I don’t mind spending money on good components. I do mind spending money on something that turns into a recurring troubleshooting project.