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During the last 6 months, I've acquired both a 566MHz Celeron2 system, and a 650MHz Duron system. Both are overclocked (naturally), and it just so happens that they are both running, at least presently, at 850MHz, and both at 1.85v.

My Celeron 2 system is based on an Asus P3V4X, using an Abit Slocket III. The Duron system is based on the Asus A7V motherboard. Both are housed in mid-tower cases, with what I would call "average" airflow - a front mounted intake fan, and the PSU for exhaust. Having bought two Agilent Arcticooler CA's from CoolPC, one for each of my computers, I decided that, along with the other heatsinks I have lying around, I'd do a bit of a comparison. I don't think any of the heatsinks I've tested here are particularly unusual, or uncommon, so I think this might make interesting reading.

All "under load" figures were obtained after letting the system run Prime95 for an hour, and taking the temperatures at that time. Idle figures were taken an hour after stopping Prime95 running, with nothing but the bare system and MBM 4.18 running. Except for the Arcticooler CA (which I tested with it's Thermal Interface Material), all heatsinks were mounted using thermal paste which I got with my Alpha heatsink - it seems pretty decent, certainly better than the Unick stuff sold by Dick Smith, but I'm sure not as good as the Arctic Silver thermal paste I've got coming soon.

566MHz Celeron2 @ 850MHz

Since I was already using a Thermaltake Golden Orb on this PC, I collected data for it, and then removed it, to try to put the Alpha PH6035 on. No joy it seems. The PH6035's clips didn't want to fit on my Abit Slocket III due to the positioning of a capacitor. I tried reversing the clip, (one end of the clip on the Alpha is wider than the other), but it didn't want to sit flat on my Celeron2 processor. To be fair to it, it was designed quite some time ago, for the old PPGA-style Celeron processors - I actually bought it with a 366MHz Celeron which I successfully overclocked to 550MHz.

As you can see, the tabs on the socket stick out further than the capacitor, meaning the Alpha's clip won't go on.

I was just going to post the Golden Orb results for this processor, but I was actually browsing the AusPCMarket website, from which I bought my Duron system - and it mentioned that the heatsink that came with my system (the Coolermaster DP5 6H51) is also suitable for FC-PGA processors. I decided to give it a try as well. Finally, a friend lent me his Intel Retail FC-PGA heatsink, that he got with his Celeron2 processor, so I tested it too.

The results of my testing are shown in the chart below.

At idle, the Coolermaster and Intel heatsinks both beat the Golden Orb by the same margin - 3ºC, but under load, the Coolermaster beats the Intel and Golden Orb by 4ºC and 6ºC respectively. While the Intel heatsink can't be beaten for the price (practically free), considering it costs roughly the same (approximately AUD$30), the Coolermaster heatsink really shows the Golden Orb a thing or two about "value for money", and comes highly recommended for an OEM processor.