Well, it's time for a new tube, and newegg's got 10% off ATM. I've looked and found some very conflicting reviews, so I'm asking techspot to help me sift out the truth. I've read some reviews about the TX-4, all have been favorable, but there was one that listed the TX-4 as about 12°C lower than TX-2, and I'm highly inclined to call BS there. Also, it was only one round of tests. This one looks pretty legit but it ranks AS5 as much worse, which I wouldn't doubt alone, but I've ready many reviews that put it much higher. I do think that AS5 is falling out though. So anyway...I'm looking for some solid results and the best performance. Price will be a factor, but the absolute price differences are not that big in thermal compounds, so it'll be secondary.