Question 1

What's the difference between a water block and a heatsink in a custom loop?

Accepted Answer

A water block replaces the traditional heatsink and transfers heat from the CPU or GPU directly into liquid coolant flowing through it, rather than into the surrounding air. Heatsinks dissipate heat passively (or with a fan) into the air; water blocks rely on a pump, radiator, and fan setup to move that heat out of the case. Water blocks are significantly more effective under sustained load, particularly for high-TDP processors above 150W, but they require a complete liquid cooling loop to function.

Question 2

Can I mix Alphacool and EK Water Blocks components in the same loop?

Accepted Answer

Yes, in most cases — both brands use the industry-standard G1/4 thread for fittings, so they're physically compatible. The real concern is material compatibility: ensure all your blocks and radiators use the same base metal (ideally copper throughout) and use a coolant with corrosion inhibitors. Mixing copper and aluminium components in the same loop will cause galvanic corrosion within months, regardless of brand. Stick to one metal family and you'll be fine mixing brands freely.

Question 3

Is the Corsair iCUE Link ecosystem worth the investment if I'm starting from scratch?

Accepted Answer

It depends entirely on how much you value cable management and software integration. The iCUE Link system hub genuinely reduces wiring complexity and the software control is polished — but every component must be iCUE-compatible, which limits your options and typically costs more than equivalent PWM alternatives. If you're building a clean, Corsair-themed system and plan to stay in that ecosystem, it's a solid choice. If you want flexibility to mix brands or prefer hardware-level control, standard PWM fans and a dedicated fan speed controller will serve you better at lower cost.

Question 4

What radiator size do I actually need for a CPU-only custom loop?

Accepted Answer

A 240mm radiator is the practical minimum for a CPU-only loop, and it works well for processors up to around 125W TDP. For anything above that — particularly Intel's 13th and 14th gen chips that can spike well beyond 150W — a 360mm radiator gives you meaningful thermal headroom and allows fans to run slower (and quieter) at the same temperatures. Adding a GPU to the loop? Budget for at least 360mm, ideally 480mm or two separate radiators.

Question 5

Are cheap cooling fittings worth buying, or is it a false economy?

Accepted Answer

Cheap fittings are a false economy in a pressurised liquid loop. A £2–3 fitting that leaks onto a £500 GPU is not a saving. That said, reputable budget brands like XSPC offer G1/4 fittings at low prices with perfectly acceptable tolerances for a standard soft-tubing loop. Where we'd avoid cutting corners is on compression fittings for hardline tubing — the tolerances matter more there, and a poorly machined fitting can crack acrylic or PETG tubing under pressure. Spend a little more on fittings from Bitspower or Alphacool for hardline builds.

Question 6

How often does a custom water cooling loop need maintenance?

Accepted Answer

A well-built custom loop with quality inhibitors typically needs a full drain, flush, and refill every 12–18 months. Clear coolant with UV dye can go longer; coloured coolants tend to degrade faster and can leave deposits in microfin water blocks. Check for discolouration or cloudiness every few months — that's a sign of biological growth or corrosion starting. Algae inhibitors (biocides) in your coolant mix significantly extend service intervals. AIO coolers, by contrast, are sealed and maintenance-free for their rated lifespan.

Question 7

Which brands offer the best warranty on cooling components in the UK?

Accepted Answer

Noctua leads the field with a 6-year warranty on their fans — exceptional for the category and a genuine indicator of build confidence. EK Water Blocks offers 2 years on most components, Corsair typically 2–5 years depending on the product line. Alphacool's warranty varies by product but is generally 2 years. For UK buyers, it's also worth checking whether the retailer (Currys, Amazon.co.uk, Scan, Overclockers UK) offers extended cover, as manufacturer warranties must comply with UK consumer rights legislation regardless of what's printed on the box.

Computer Cooling System Parts & Accessories Price Comparison

ASUS ROG RYUJIN III WB Water block

ASUS ROG RYUJIN III WB White Edition Water block

Phanteks EZ-FIT Adapter fitting

Phanteks Glacier EZ-Fit Tube bending kit

Phanteks Glacier G40 Water block

Phanteks EZ-Fit 450 Water block

Phanteks EZ-Fit 450 Water block

Alphacool 10269 computer cooling system part/accessory Backplate

Alphacool 10261 computer cooling system part/accessory Backplate

Alphacool 10248 computer cooling system part/accessory Backplate

Alphacool 10270 computer cooling system part/accessory Backplate

Alphacool 13851 computer cooling system part/accessory Coldplate

Alphacool 13893 computer cooling system part/accessory Coldplate

Alphacool 10265 computer cooling system part/accessory Backplate

HPE ProLiant DL3XX Gen12 High Performance Heat Sink Kit

Computer Cooling System Parts & Accessories Price Comparison