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Globalwin's flagship cooler the CAK-II 38
Click to enlarge Product : Globalwin CAK-II 38
Manufacturer : Globalwin
Price : 32.84
Available from : Overclock UK

When we initially heard the name of the product it didn't put good thoughts into our head, but upon visual inspection the CAK-II 38 is far from being cack. Copper heatsinks have been around for a good few years now. Initially it was Alpha who produced copper embedded aluminium heatsinks, then came the Hedgehog; the first widely available full copper heatsink. The performance of the Hedgehog pretty much blew everything away and more manufacturers followed it's lead in producing full copper heatsinks. Whilst everyone knew that heatsinks made out of copper would be better, until a couple of years ago, it hadn't been financially feasible to make them in large numbers. Now, however we are prepared to pay anything up to 80 (even three figure sums isn't heard of amongst die hard weirdos overclockers).

Chiefly you have two types of heatsinks. Bonded fin, where the fins are either placed onto the heatsink itself using a clip or extruded fin, which is when you have the metal fins "carved" out or melted into the base. The latter is, of course more expensive since you can have a lot more wastage (however the metal can be smelted down and re-cast again). Whilst it's hard to see which is better since no company has produced the exact same model in bonded fin and extruded designs generally speaking it should be extruded fin that wins. This is mainly due to that fact that you don't have another interface between the fins and the base of the heatsink. However, it is arguable that if this interface between the fin and the heatsink base was something like silver or gold then it would in fact, increase thermal conductance. We don't suppose anyone has gold glue to test this hypothesis out?

Click to enlarge You are presented with a nice box, which has on one side statistics about the CAK-II 38. The 7000 RPM fan which is said to have tolerances of 15%, is fitted as standard on these models. This does, of course produce a large din and some users might want to replace it with a quieter version. Also stated is that the CAK-II 38 is rated for processors up to 2.3Ghz. Whilst this cooler is designed for Socket 462 (A) and Socket 370 (Pentium 3 and the like), none of which have come close to 2.3Ghz (especially the latter), it's good to see that Globalwin have left room for overclockers. In fact they even mention it on the box - "Exellent for over-clocking" - someone obviously forgot the spell-checker.

Inside you are presented with a well packed and nicely illustrated leaflet. Gone are the days when products came with useless half eligible printouts. Globalwin have also enclosed a case badge with their logo. All in all, a nicely presented package.


Globalwin have made installing the CAK-II 38 a pretty bog standard heat sink installation by having everything in place. The metal shroud that covers the heatsink Click to enlarge is the mount for the high speed 60mm fan. The fan comes with a chrome grill pre-attached which is a nice touch, although with such a high speed device it might be considered a necessity. Such is the power rating of the fan, Globalwin supply a 3pin to 4pin power converter as standard.

The retainer clip provided is easy to attach to the socket, however it would have been better to see the highly recommended three clip system (to reduce the pressure put on the socket's hinge). Globalwin also supply the CAK-II 38 with a thermal pad. Most people would want to scrape this off and use their own thermal compound, however in the interests of measuring the performance of the supplied package we left it on.


We were expecting good things from the top of the range Globalwin offering and we managed to get a new testing machine ready in order to give this heap of metal a run around. The specifications of the machine it was tested on are :
  • AMD Athlon XP 2000+
  • Abit K7RA-133 motherboard (thanks Overclock)
  • 512Mb Kingmax TinyBGA PC2700 DDR RAM
  • Leadtek Winfast Ultra TD 250 (Geforce 4 Ti4600)

    We compared it against our old stalwart, the Silver Mountain, which still seems to do the job quite well (considering how old it is). All results are taken with the machine under "full load" - that is to say 100% CPU utilization (by running programs such as Seti).

    As we can see, the Silver Mountain is struggling to cope with the higher clock speeds. It still handles them, however most people would be slightly more comfortable with the temperatures produced when cooled by the Globalwin CAK-II 38. Indeed, the CAK-II 38 performs well and takes the top spot for cooling this version of our test machine.

    One of the main reasons we decided to pit the Silver Mountain and the CAK-II 38 against each other is due to the fact that their fans are virtually identical. Both do around 35CFM and therefore we can find out how good the heatsink itself is. It is important to note that we left the thermal pad that was supplied on, and if you decide to use a high performance compound (such as Arctic Silver) then it is quite possible that temperatures will be brought down further.


    Globalwin present the CAK-II 38 in lovely retail packaging and give a heatsink that is well made and performs well. The supplied fan is powerful and does a good job, some will want to swap it for something a little quieter, however Globalwin has done the right thing in providing a high performance unit to complement the heatsink. The heatsink itself is a full copper unit rather than just a copper embedded base and the whole thing is kept in place by an easy mounting clip. Although if the clip had three latches it would be safer for the socket.

    Overall, a well made product that performed well and is selling at a competitive price.

    Footnote : We had one of our Cooljag 1U coolers kicking about, and decided to take a quick picture to compare sizes. May we present, Little 'n Large.

    Click to enlarge