Noctua NC-U6 Northbridge Heatsink Review

Cooling/VGA & Other Cooling by jmke @ 2007-01-22

Noctua made quite a splash with their high end NH-U series of heatsink, delivering high performance at low noise levels, this miniature tower version fits on your northbridge and is passively cooled for total silence. Can it keep a hot nForce4 SLI chipset from frying, let´s find out.

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SLI- or Crossfire-able ?

SLI or Crossfire a problem?

Many of the 3rd party chipset coolers will be larger then the default one, the NC-U 6 is not different, although it has a quite slim design, its height will make it difficult to fit a longer VGA card if your chipset is right behind the PCI Express slot.

On the Asus A8N-SLI Premium the chipset sits between the two 8x PCI Express slots, which surely comes in handy:

Madshrimps (c)

Madshrimps (c)


A close fit, the 7900GT used it not as long as the 7900GTX or newer 8800GTX, so some problems may still arise; if you use mid-range VGA cards, the chipset cooling can fit correctly;

Throwing a 7800GT in the mix makes it a tighter fit:

Madshrimps (c)

Madshrimps (c)

Madshrimps (c)


It’s still do-able, although longer VGA with dual slot cooling will not fit with the NC-U 6 installed.

Some performance tests and conclusion next ->

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