G4 7447A Fan Specs?

[MBongo]

Seeking info on fans for a Newer Technology - MAXPower G4 7447A single processor upgrade. As the Sonnet and the NewTech appear so similar, think I’d prefer the seemingly, lower profile Sonnet fan info. (Perhaps a mistake?) Target Quicksilver.

AND, anyone owning the same single-processor variant NewTech… 1.6GHz switch settings would be nice too. Online mauals note SW1 and SW2 settings, but this one has SW1 and SW3 (under heatsink) switches that need setting and I’ve no pertinent documentation on this processor.

After fans, trial and error switch settings may ensue.

Again, this is a single processor unit that does not have the 2nd set of switches as seen in the cut-out areas of the heatsink, pictured below.

 

[Franklinstein]

I got a DP 1.6 version of the Sonnet upgrade. The attached heatsink is crap: my MDD 2003 ran hot and the big fan was pretty much always at full speed with the upgrade installed. The upgrade is designed to be swapped between the XServe G4 and MDD so they went with the lowest common denominator in terms of the heatsink, which is the low-profile XServe style. Luckily I had the huge solid aluminum heatsink from the original processor, so I carefully removed the upgrade from its included heatsink and reassembled in the same manner as a stock CPU board. Instantly full-load temps dropped to half and the big fan ran at half speed or less.

Generally the fans attached to the Sonnet upgrades tend to have a fairly short lifespan; I've bought several second-hand and they're usually noisy or dead. Unless it's going into an AGP or GE G4, I always remove the processor card from the attached heatsink and reuse the computer's original one (after removing the old thermal pad and properly cleaning it). The heatsink for the DA and later models is much better than the one Sonnet provides anyway; the only reason they discourage reusing the original heatsink is because amateurs often install them improperly so it's easier for their warranty department if they simply include one and disallow removing it.

As far as switches, I'm not sure if there are consequences outside of not booting or overclocking. When I installed mine the first time it reported 1.8GHz, so I changed the switches until it read 1.6GHz like it was supposed to. These chips are already overclocked from Sonnet so they don't need any extra stress.

TL;DR: just reuse the stock heatsink if you've got it. Be sure to properly clean it and apply new thermal paste.