If it weren’t for the branding on the Kühler H20 620’s fan and water block, you’d be forgiven for mistaking it for a Corsair product. Its mounting bracket is the exact same one used in Corsair’s Hydro H50 and H70 coolers, while its radiator looks like the H50’s and the pump unit looks like the H70’s. Is this a case of industrial espionage?
The answer is less sordid, but still full of intrigue. The reason that the Antec Kühler H2O 620 looks like Corsair’s last two coolers is that, well, that’s basically what it is. Antec has tapped Asetek, the OEM behind the Corsair H50 and H70, for its Kühler series, which feature’s Asetek’s newest pump unit and radiator.
Antec’s Kühler series looks just like Corsair’s earlier coolers, and there’s a reason for that.
While the new pump unit and radiator might look familiar, the Kühler 620 sports some features that are distinct from its Corsair-branded predecessors. First, its liquid-bearing tubes are smooth and rubbery rather than corrugated and plastic-feeling, and they feel more flexible. Second, the little plastic adapters that let you swap the mounting bracket between LGA 775, 1155/1156, and 1366 are green and blue instead of black. Finally, the radiator fan plugs into a lead on the pump unit, and the pump unit plugs into the CPU_FAN header. Previous coolers had both the fan and pump plug into the mother-board, which can lead to confusion. This system eliminates that confusion.
Installation of the Kühler 620 is easy. The 12cm fan and radiator mount in place of your case’s rear exhaust fan, and the pump/heat-exchanger unit is held tight against the CPU by a familiar backplate/clamp combination. The clamp has a series of barbs around the edge that correspond to ledges around the pump unit; once the pump unit is against the CPU, you turn the cooler a few degrees to match the barbs and ledges, then tighten the mounting mechanism to the backplate. We only had one slight issue—it’s very easy to overtighten the mounting screws and strain the blue 1156/1366 screw adapters on the mounting bracket.
Once installed, the Kühler H2O 620 performed well. At 100 percent CPU load on all cores using Intel’s custom Lynnfield thermal utility, the Kühler brought our overclocked CPU to 65.75 C—slightly cooler than Corsair’s H60, and 2 C cooler than the H50. At idle, though, the Kühler was the worst of the bunch, at 38 C with zero CPU activity. None of the liquid coolers outperformed our dual-fan Prolimatech Armageddon, our air-cooling champion.
The Antec Kühler H2O 620 performs better than the Corsair H50, which is built on the same framework, and the Corsair H60, which isn’t. It’s also $5 cheaper than the former and $10 cheaper than the latter. This is a whole lot of cooling with not a lot of noise, for not a lot of dough.
Idle temperatures were measured after an hour of inactivity; load temperatures were measured after an hour running Intel’s internal Lynnfield thermal testing utility at 100 percent load. Test system consists of Intel Core i5-750 overclocked to 3.2GHz on an Asus P7P55D Premium board in a Corsair 800D case with stock fans. Temperatures taken with HWMonitor.