Planning Your First Custom PC Build: A Murrayfield Guide

Planning your first custom PC build in Murrayfield? A bench guide to the parts, the common DIY mistakes we see, and setting a sensible budget split.

7 October 2026 8 min read Custom Builds Alex M.
Planning your first custom PC build: a Murrayfield guide from PC Repair Services

Planning a first PC build is the fun part of the project and the part most people get slightly wrong. We see the finished results in Murrayfield, Cramond and across west Edinburgh — some of them running beautifully, some of them stuttering on games they should be fine with, and a few that are quietly running too hot because of one small decision made at the parts stage. This guide is the planning conversation we have with first-time builders on the bench, written down.

It is deliberately not a parts list. The right parts change every quarter and depend on what you actually want to do with the machine. What does not change is the order of the thinking.

Start With Honest Use Cases, Not Parts Lists

Before any component goes on a shortlist, write down what the PC will actually be asked to do, in your own flat, in a typical week. “Gaming” is not a use case. “Playing modern shooters at 1440p on a 144Hz monitor” is. “Work” is not a use case. “Running two 27-inch monitors, Excel, Teams and a browser with forty tabs” is. The gap between those two profiles is roughly double the budget on the graphics card alone.

Think honestly about three things: the resolution and refresh rate of the monitor you will actually buy, the heaviest game or application you expect to run, and how long you want the build to feel current. A first-time builder in Murrayfield who plays mostly older strategy games at 1080p needs a very different machine from someone in Corstorphine who wants to stream Unreal Engine titles at 1440p. Picking the wrong profile is where overspend and under-spec both happen.

The Budget Split That Actually Works

On a mid-range gaming or creator desktop, the split that quietly works on the bench looks like this:

  • Graphics card: around a third of the budget. This is the single part that most changes what the PC can do. A good GPU with a weaker CPU still games well. The reverse is a lopsided build.
  • Processor and motherboard: about a quarter together. Match the socket to the CPU generation, pick a board with the connectivity you actually need, and resist the urge to pay for features (overclocking headroom, Wi-Fi 7, five M.2 slots) you will not use.
  • Memory: enough, at a sensible speed, in a kit. On modern platforms, a two-stick kit at the speed the CPU officially supports is the quiet answer. Mixing two separate single sticks is where most memory headaches start.
  • Storage: one fast NVMe for the system and games. A good single drive beats splitting across a slow SSD and a mechanical disk unless you have a specific archival need.
  • Power supply and case: not where to save. A quality PSU with 20 to 30 per cent headroom over the GPU’s rated draw, and a case with real airflow, together decide how boring the next three years will be.
  • Cooler, fans, cables, Windows licence, monitor if you need one. People forget these, run out of budget, and end up with a 4080-class card paired with an unlit, airless case and a bargain-bin monitor. The whole build looks sad.

If you cannot afford that whole split now, lower the GPU tier rather than skimping on the case or the PSU. The GPU is the easiest part to upgrade in two years; the case and the PSU rarely are.

Hidden Costs People Forget

Nine first-time builds out of ten we commission for customers come in with the main components picked and some of the smaller things missed. The quiet costs:

  • A genuine Windows licence. Perfectly legitimate OEM keys exist; mystery marketplace keys are a different story.
  • Case fans. Many modern cases ship with one or two, which is not enough for a hot GPU.
  • Thermal paste if the cooler does not include a usable pad.
  • A monitor cable in the format your GPU actually outputs (DisplayPort 1.4 or 2.1 for most high-refresh use).
  • A surge-protected mains strip. In older Murrayfield and Stockbridge tenement flats, the wiring is fine but event-spikes still happen on the same ring as kettles and heaters.
  • A small container of thin cable ties and a philips screwdriver with a magnetised tip. Nothing eats an evening like a dropped standoff screw.

Where DIY Builds Go Wrong on the Bench

These are the actual faults we see when a self-built PC lands with us for diagnosis, in rough order of frequency. Noticing them in planning is cheaper than noticing them later.

  • Memory in the wrong slots. On a four-slot board, two sticks almost always belong in slots 2 and 4 (or whichever pair the motherboard manual marks). We regularly see sticks sitting in 1 and 2, running single-channel, and the owner wondering why games stutter.
  • Fans fitted the wrong way round. The arrow on the fan hub points at the direction of airflow. Front fans should pull air into the case, rear and top should push air out. One flipped fan can turn a case into a convection oven.
  • CPU cooler not fully contacted. Either because the standoffs were not tightened in the right diagonal sequence, or because a protective film was left on the cooler’s cold plate. Temperatures run twenty-plus degrees high and the CPU throttles under any real load.
  • Undersized power supply. A PSU rated right at the GPU’s spec can trip during transient spikes months into ownership, especially on newer high-end cards. Random shutdowns under load follow.
  • Front-panel connectors reversed or missed. The power button working but the HDD light stuck on, or front USB-C that will not negotiate properly, almost always traces back to the small block of pins by the SATA ports.
  • Memory speed left at default. On a desktop with XMP (Intel) or EXPO (AMD) in BIOS, the memory runs well below its advertised speed until you turn the profile on. A one-click setting that most first-time builders miss.

Choosing Parts That Actually Work Together

Each part has a short list of things to double-check against the others. Short checklist from the bench:

  • CPU and motherboard: same socket, same chipset generation, with a BIOS that supports your exact CPU out of the box (or a plan for flashing it before first boot on a newer chip).
  • Memory and motherboard: on the official QVL for the board where possible, and matched to the memory controller’s official speed on your CPU.
  • GPU and case: measured length and height clearance, plus two or three centimetres of air behind the fans.
  • CPU cooler and case: tower-cooler height clearance, or a radiator mount position that is not fouled by the memory or the GPU backplate.
  • PSU connectors: the right number of 8-pin EPS for the CPU, the right 12V-2x6 or 8-pin PCIe for the GPU, and modular cables that are the ones from your PSU, not a different brand’s.
  • Front-panel I/O: if you want front USB-C, the motherboard needs the matching 20-pin internal header.

If any of this planning is unfamiliar, our custom PC builds service handles the parts list, the ordering and the assembly end-to-end, and the PC builder on the site is a good starting point for pricing a configuration before you commit.

Commissioning After the Build (The Half Hour That Matters)

Most of the quiet long-term faults we see in self-builds come from the thirty minutes right after the first boot being skipped. Before you install your first game, run through this:

  • Into the BIOS, turn on XMP or EXPO so the memory runs at its proper speed. Save and reboot.
  • Install Windows cleanly on the NVMe. Our operating system installation work follows the same steps: a clean install, the correct chipset drivers from the motherboard maker, then the GPU driver from Nvidia or AMD. Not a “driver pack”.
  • Open a temperature monitor and run a short stress test. CPU under 85°C and GPU under 80°C at steady load are the loose benchmarks. Our guide on how to monitor CPU and GPU temperatures in Windows 11 covers which numbers matter.
  • Run a full-pass memory test overnight. One flipped bit here saves days of chasing phantom crashes later.
  • Check the drive’s SMART data is clean. New drives are not always healthy out of the box.
  • Register the Windows licence to a Microsoft account you will keep. Modern Windows installs often enable device encryption automatically; a recovery key lives in that account.

Only after those are green do you load up the first game. If the stress test fails, work backwards to the plan and fix it on the bench, not after a month of frustration.

What to Do With the Old PC

Most Murrayfield customers who move to a custom build still have a working desktop or tower to retire. If it has a modern SSD and sixteen gigabytes of memory, it is often worth keeping as a second machine for a child’s homework or a media PC. If it is genuinely at the end of its road, our IT recycling and e-waste disposal handles data wiping and WEEE-compliant disposal properly, so you are not leaving a drive full of personal data in a kerbside bin.

If any of the components in it are still useful on the new build — a decent monitor, a healthy SSD, a working keyboard and mouse — our hardware upgrade work can test them properly before they go into the new machine. Not every component ages well, and a dodgy old drive on a brand-new build is the frustrating version of this story.

Where We Fit In, Locally

Our workshop is on Parkhead Drive, about fifteen minutes from Murrayfield by car along the A8, and we see first-time custom builds come from across west and central Edinburgh — Murrayfield, Cramond, Corstorphine, Stockbridge and Bruntsfield in particular. Some customers do their own build and bring it in for a bench check, a thermal re-paste or a stability test; others ask us to plan and assemble the whole thing with their chosen parts.

If you are at the planning stage, two existing guides are worth a read: our planning guide for a compact gaming build in a small Tollcross flat covers the trade-offs when space and noise matter, and the used gaming PC buying guide from Tranent is the honest counter-argument if a pre-owned machine would get you there sooner.

When you are ready for a parts review or a build, a custom PC build in Murrayfield starts with a conversation about the use cases above, a parts list that matches your budget split, and a build with proper cable management, thermal testing and a signed-off commissioning check before it leaves the bench. Book a build consultation online or tell us what you’re planning and we will tell you what, if anything, we would change on your shortlist.

Last updated: 7 October 2026

Frequently Asked Questions

What Murrayfield and west Edinburgh customers ask us before their first custom PC build.

Not automatically. A well-planned custom build gets you better parts and a longer upgrade path for the same money as a mid-range pre-built, especially on cooling and the power supply. A badly planned custom build runs hot, is harder to warranty, and may cost more once you add Windows, decent fans and a monitor. The win is in the planning, not the fact that it is self-assembled.

Prices move constantly, so the honest answer is to work from a split rather than a figure. A gaming build at 1080p needs less GPU and PSU than one at 1440p high refresh, and a creator machine shifts money from the GPU to the CPU and memory. We will plan a build to any realistic budget during a consultation and tell you what to cut or shift if the split does not add up.

Yes. We will review the list first for compatibility and headroom before the parts are ordered, then assemble, cable-manage, thermal test and commission the build on the bench. If something on your list does not match, we will say so rather than build around it. The parts remain under their own manufacturer warranties.

Memory in the wrong slots. On a four-slot motherboard, a two-stick kit belongs in the pair the manual marks (usually slots 2 and 4). We see new builds every month running their memory in single-channel because the sticks were placed next to each other instead, which causes stuttering in games and hesitations in day-to-day use. It is a thirty-second fix once the pattern is recognised.

Yes. The workshop is on Parkhead Drive, roughly fifteen minutes from Murrayfield by car along the A8, and we routinely collect towers from EH12 and the surrounding west Edinburgh neighbourhoods when a desktop is awkward to move. For in-home set-up of a new build, we can usually arrange a visit on the same week it is booked.

Planning a First Custom Build in Murrayfield?

Book a build consultation or send us your shortlist. We will review the parts for compatibility and headroom, build and thermal-test the machine on the bench, and commission it properly before it leaves.

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