A customer from the Montpelier side of Bruntsfield came into the workshop a few weeks back with a desktop that was six years old and no longer felt like the machine she had bought. The video editing she did on the side was crawling, the fans sounded like a hairdryer, and she had already decided a new PC was the answer — but she did not want to throw the whole thing in the skip. The SSD held every project file, the GPU was two generations old but perfectly playable, and the case had been the one piece she had chosen herself. The real question was not “new or not”. It was “what honestly carries over, and what do you quietly need to retire?”.
It is the question we hear in Bruntsfield more than any other, and the answer is almost always more nuanced than a parts list. This post is a bench-level walk-through of which parts in a working desktop are genuinely worth carrying into a new custom PC build, which ones look fine and are quietly on borrowed time, and the two decisions — the power supply and the Windows licence — that catch people out when they move the parts over themselves.
The Carry-Over Question We Get Every Week
The decision is not binary. A good custom build on top of a few of your existing parts can land you a machine that feels completely new for a fraction of the budget of starting fresh — but only if the parts you keep are the right ones. On the bench we treat the current PC as a parts donor and go through it piece by piece, asking three questions of each component. Is it still fast enough that keeping it does not bottleneck the new build? Is it still healthy enough that it will outlast the new motherboard? And does the new platform physically support it without compromise?
A part that fails any one of those three is a retire. A part that passes all three is a keep. There is no shame in a build sheet that reuses four of your eight parts, and no virtue in starting fresh for the sake of it. We have seen Bruntsfield customers spend a long weekend fighting an old case that was almost but not quite compatible with a modern motherboard, and we have seen others save a sensible sum by carrying over a GPU and an SSD that had years of life left in them.
SSDs: Almost Always Worth Keeping, with One Caveat
A healthy SATA or NVMe SSD is the easiest and most sensible carry-over on any desktop. The data moves with it, the Windows reinstall happens on top of it, and modern motherboards accept the same drive formats they did five years ago. We routinely transfer an existing 1 TB NVMe from an old tower into a new build and the customer is up and running on the same partition the same evening.
The caveat is drive health, which is not the same as drive age. On the bench we check SMART data before any SSD leaves the donor tower — the number of host writes, the percentage of spare blocks consumed, and any reallocated-sector or pending-sector count. A six-year-old SSD with light desk use can look brand new in SMART and is a safe keep. A three-year-old SSD out of a laptop that ran games off it every evening can be at 90% wear and is quietly on borrowed time, and we would not move it into a brand-new build. The Edinburgh SSD failure signs post covers the warning patterns we see most often on the bench. If the old SSD passes the health check it comes over; if it does not, this is the moment to replace it, not six months after the new build is already live.
GPUs: The Easiest Carry-Over, If the Power Budget Works
The graphics card is the single part people assume they must replace, and it is usually the one that carries over most cleanly. A GTX 1660, an RTX 2060, an RX 6600 or anything newer is still perfectly playable at 1080p and most 1440p titles, and it slots into any current motherboard with a spare PCIe x16 lane. The transfer itself is a two-screw job. If your current GPU runs your games now and you are not changing resolution, there is almost never a reason to buy a new one just because the rest of the build is new.
The one place this question gets interesting is the power budget. A new generation of CPUs tends to pull more peak power than the one it replaces, especially under video-editing and rendering loads, and that eats into the headroom a PSU had for the graphics card. A 550 W power supply that comfortably ran an old six-core CPU and an RTX 2060 can land right at the edge when it has to run a new eight-core and the same GPU, and the symptom is a tower that reboots under combined load without any warning. We mention this because the fix is almost always a new PSU, not a new GPU — and if you were going to buy a GPU for the wrong reason, that is money better spent somewhere else.
The Case: Usually a No, and Here’s Why
The case is the part people most want to keep and the one we most often advise against carrying over. A pre-built OEM tower — a Dell, an HP, a Lenovo from a few years ago — usually has a proprietary front-panel header, a non-standard motherboard mounting pattern, or a power-supply bracket that only takes the maker’s own PSU. We have had Bruntsfield builds slow to a crawl because the front USB and power button wouldn’t connect to a standard ATX motherboard without a cable splice that was not worth the time saved.
A proper enthusiast case — a Fractal, a NZXT, a Corsair, a Phanteks from the last few years — is a different conversation and almost always a worthy keep. Standard mounting points, standard front-panel connectors, modern cable routing. If you invested in a quiet case with good airflow five years ago, it is probably better than anything we would reach for today, and it stays. On the bench the quick test is to open the side panel and look at the motherboard tray — if the standoffs line up with a modern ATX or micro-ATX board without drilling, the case is a keep.
RAM and the DDR4 / DDR5 Line
RAM is the part most often lost to a generational switch, and the one that catches more Bruntsfield customers out than anything else on the parts list. DDR4 and DDR5 use physically different sockets on the motherboard and will not fit each other — and almost every new mid-range CPU released in the last couple of years is a DDR5 platform. If your current PC runs DDR4 the memory does not come forward, no matter how good a condition it is in.
There is still a sensible build on the DDR4 side for the budget-conscious, and we design those for Bruntsfield customers regularly — especially where the goal is a quieter, cooler editing or office build rather than the latest frame rates. If the current PC runs DDR4 and the build budget is tight, choosing a motherboard that keeps the DDR4 kit is an entirely valid route. If the build is aiming for current-generation performance, the DDR5 jump is non-negotiable and the DDR4 goes on the shelf as spares for a friend’s machine. The Loanhead pre-built or custom guide covers the broader memory question when the choice is between a prebuilt tower and a custom one, and the Cramond upgrade-or-build decision post covers the sibling question of whether a RAM upgrade on the current machine is enough.
The Power Supply Is Where Bruntsfield Builds Go Wrong
The PSU is the one part a surprising number of self-builders carry over without checking, and it is also the one most likely to kill a brand-new motherboard a year later. The capacitors inside a power supply are consumable — they lose capacity gradually with use and faster with heat. A five-year-old PSU that still boots an old tower may be delivering ripple and voltage noise that was fine for the hardware it grew up with, and genuinely harmful to a modern VRM that expects clean 12 V.
Our rule on the bench is that a PSU over five years old does not come forward into a new build, no matter how it looks. A three-to-five-year-old quality PSU (Seasonic, Corsair RMx, be quiet! Straight Power) with a sensible wattage headroom for the new parts can carry over after a load test. A no-name PSU of any age gets retired. If you need to replace it, you can see current options in our power supplies section, and we are happy to specify one for the exact parts list in your plan.
Your Windows Licence: What Actually Transfers
The Windows licence is the carry-over most people get wrong, and the one that is easiest to get right if you know where to look. A retail Windows licence — one you bought as a boxed product or as a standalone digital key — moves cleanly from one PC to another. An OEM licence — the one that came with a Dell, HP or Lenovo pre-built — is tied to the original motherboard and does not legitimately transfer. A “digital licence” linked to your Microsoft account on an OEM machine will usually re-activate on a new build after a hardware change, but Microsoft treats this on a case-by-case basis and we have had Bruntsfield customers end up on a “Windows not activated” watermark they did not expect.
The honest advice we give is to budget for a Windows licence on any new build that was donor-sourced from an OEM pre-built, and to carry the existing retail licence forward on any new build that was donor-sourced from a self-built PC. Either way, the SSD gets a clean install of Windows during the build rather than a straight transfer of the old installation — the drivers and chipset underneath are different, and a clean install is faster to live with than a sequence of “device not found” messages a week in. The OS installation service page covers what that step looks like when we do it on your behalf.
Bringing a Bench Plan to Bruntsfield
If you are weighing a new custom build in Bruntsfield and you have a working PC under the desk already, the most useful first step is a short conversation about what is actually in it. We will go through the drive health, the GPU model, the PSU age and wattage, the RAM generation and the case model, and we will come back with a build sheet that treats your current PC as the donor it is. On most of these jobs that means two or three parts carry across and three or four come new — a motherboard, CPU, RAM, PSU on the new side, SSD and GPU on the keep side, with the case decided after we have seen it.
Bruntsfield is a five-minute drive from the workshop at Parkhead Drive, with EH10 running from Bruntsfield Place and Montpelier up through Whitehouse Loan and across to the Links. We collect across EH10 and EH3 when the desktop is awkward to carry over, and most consultation visits are a thirty-minute look at the current parts and a quote the same evening. The Bruntsfield custom build page covers the specifics for the area, and the hardware upgrades service page is the other side of the same decision if the honest answer turns out to be “upgrade this one, don’t replace it”.
If you would rather we did the whole thing — parts selection, transfer, clean Windows install and testing — book a slot or get in touch with the model of the current PC and we will walk through the carry-over question before any parts are ordered.
Last updated: 21 October 2026