Wesley's Tool-Box

• Of Heat and Heatpipes

That would've been the end of the story, had it not been for the annoyingly large amount of heat pouring out from the stock heatsink installed on the GF4. The heatsink was quite hot even when running at normal speeds, which was worrying me. Furthermore, the 50mm fan installed on the heatsink made a noticeable whine, running at 12V, which was disturbing since all my system fans were running at 5V, low-noise operation. The stock heatsink had to be dealt with. Then I remembered that Zalman Tech had a new video card heatsink they wanted me to test out.



The ZM50-HP video card cooler is unlike any previous coolers Zalman had created to date. It does not have their trademark 'flower heatsink' design, while it showcases one of the newer cooling technologies known as heatpipes. A heatpipe, simply to put, is sort of a 'superconductor' in terms of thermal aspects. It can transfer heat from one end of a foot-long pipe to the other end in a matter of a couple of seconds, which is at least tens of times faster than what you can expect with a solid tube made of copper, one of the most thermally conductive elements.

The heatpipes here are used as a quick heat transport between the multiple heatsinks in the heatpipe-linked cooling system. This means that the heat generated from the heat souce (i.e. video card's GPU) is quickly and evenly moved to all the heatsinks on the heatpipe, so the effective heat dissipation area is effectively increased, no matter how far apart they may be. In contrast, a conventional heatsink cooling system will have the heat concentrated near the heat source and thus the heatsink fins farther away from the heatsink would not be as effective in dissipating the heat compared to the ones near the heat source. You can clearly see that the heatpipe can greatly enhance the cooling performance when properly integrated to a cooling system.



The ZM50-HP model, however, is targeted at budget-level video cards with relatively low heat output. For a higher performance video card like the GF4Ti card I now have in my system, I need to use a bigger heatsink. This is why I will use a heatsink from the ZM80-HP model. This model originally comes with two massive heatsinks that is almost as big as a GF4Ti card itself. You can see one of these in a picture above. I can only use this huge heatsink on the back side of the video card because the front side does not have enough room. So my personal video card cooler will be a mix of the ZM50-HP and ZM80-HP models. In addition to this, I bought some old heatsinks made for cooling classic Pentium processors that I would cut up to use as ramsinks (heatsinks for memory chips).

• Escape from the Low-End

The single most annoying thing that bothered me in designing the series of Portable Athlons (First & Second) is that I could not use a full-height video card. This is because the system's internal dimensions limit all components to be less than or equal to around 8cm. Even a relatively shorter card (among full-height) such as a conventional GeForce3 Ti200 models are at least 9cm, and the higher performance cards like GeForce4 Ti series are 11cm in height. If I were to try using these cards, the top part would stick out of the case in an ugly manner. Meanwhile, a budget-sector cards like GeForce4 MX can come in a low-profile version, measuring around 7cm in height, which easily fits into the system.

Unfortunately, this meant I was to be kept in an infinite loop of budget-sector cards, since there is little chance that a video card manufacturer would make a high-performance model into low-profile version. This is due to the design constraints (high-performance cards need a lot more supporting components for proper operation) as well as the appearance factor (low-profile video cards tend to look cheap). This does not bode well when you're seeking ultimate performance out of your system. Also, there's already a mobile version of Radeon 9000 out, meaning that a notebook computer in the near future can beat my GF4MX-equipped system in game performance, while there is no low-profile version of Radeon 9000 to be found.

So I concluded that something dramatic had to be done. No, that didn't mean I'd throw out the Portable Athlon idea altogether and go back to the traditional case. I discovered that I was neglecting a fairly obvious design improvement - rotate the video card like I had already done with the PCI cards.



This might not look normal. In fact, it isn't; you don't see many video cards plugged in parallel to the mainboard. This had been achieved by using a tall AGP riser card which rotates the AGP port 90 degrees at a height of around 6cm. This way, I only sacrifice one possible PCI slot, which wasn't in use at the time anyway. The area where the PCI card could have been now has the video connector sticking out.



This is the way it is looking from the top. It does have a very unorthodox arrangement of cards. To the far left, you can see the AGP riser card sticking out and the video card connecting to it from the top area. To the right, there is a PCI riser card that provides connection to the SB Audigy card and the USB2.0/IEEE-1394 card. In the middle, the LAN card takes an unusual position in between. This is possible because it is very small and does not touch the video card's heatsink at all.

Finally, I was able to break free from the vicious loop of budget video cards. As some of you might have noticed, I have now plugged in a GeForce4 Ti4200 card from Leadtek as the video card. It's a WinFast A250LE Light model, which does not have the video-out plug or the DVI connector, of which I have no use for. Even the fastest card currently released, Radeon 9700, has almost identical dimensions, so my upgrade path has a bright future.