£2,945 UK high-end PC for game development, creative work and gaming — what would you change?

The build is broadly well balanced for the workload, especially if you really are compiling, running an engine, recording or streaming, and using creative software at the same time. It is not automatically overkill just because the use cases are varied. The 9950X3D gives you strong gaming performance while still offering plenty of cores for development and rendering, although a cheaper non-X3D Ryzen 9 could be better value if gaming is less important.

The 1000W RM1000x is perfectly reasonable with a high-end graphics card. You could save money with a quality 850W ATX 3.1 unit, but the extra headroom is useful for transient loads and future upgrades. The airflow plan also looks sensible with a top-mounted radiator exhausting heat out of the case.

I’d be most cautious about the pre-owned GPU and SSD, not the RAM. Memory has no moving parts and is generally a relatively safe used purchase, provided it passes a proper memory test. The CPU is also fairly low risk if it has been tested, but the saving here is only about £35 compared with buying it new, so I’d probably buy the processor new for the manufacturer warranty.

For the graphics card, check the retailer’s exact warranty and returns process, and test temperatures, stability, fan noise, ports and performance immediately. An SSD should be checked for health, power-on hours, total bytes written and its remaining warranty. A replacement under a retailer warranty may not be the exact same model, and could be store credit, so factor that into the apparent savings.

The SN7100 is a reasonable general-purpose drive, but in a premium workstation I’d compare its endurance and sustained-write behaviour with higher-end TLC drives. A single 2TB drive can also become cramped quickly once Windows, development tools, games, project files, source assets and video recordings accumulate.

I would consider using a separate boot and applications drive plus a larger project or game drive if the pricing works out. That is not essential for performance, though, and I would prioritise getting the memory and pre-owned component pricing right before spending extra on a faster SSD. The North XL is more about convenience and expansion than necessity; a smaller case could save money if you do not need its extra room for radiators, drives or future hardware.

The RAM price deserves another look. £555 for 64GB is extremely high unless current pricing has become unusual, and 48GB or a different 64GB kit may offer much better value. For Blender, video work and large development projects, 64GB is sensible; I would not reduce capacity just to save a small amount. If you expect larger scenes, virtual machines or several heavy applications open, 96GB or 128GB could eventually be more useful than very expensive RGB memory.

DDR5-6000 is a good target on AM5, but a dual-rank kit may need slightly lower settings depending on the CPU’s memory controller and motherboard BIOS. I’d start at 6000 MT/s, run a proper stability test, and be prepared to use 5600–5800 if necessary. Stability matters more than a small memory-speed difference.

I would compare the complete parts list against a high-end prebuilt before ordering, but building it yourself can still be cheaper and gives you control over every component. An X870 or X870E board is not automatically an upgrade: the B850 Tomahawk should be enough if it has the M.2 slots, USB connectivity, networking and expansion you need. More expensive boards mainly make sense for features such as additional PCIe lanes, USB4, extra storage connectivity or unusually demanding sustained CPU loads.

I would also check the exact cooler and case compatibility, confirm that the radiator clears the motherboard and memory, update the BIOS if required, and make sure the graphics card’s power cable is routed without a sharp bend. Apart from the unusually expensive memory and the small CPU saving, there is no obvious fundamental mistake in the parts list.