bled red since i built my first rig...amd athlon 1ghz in a monstrous black antec full tower, immediately bought a peltier and a water block when i realized i would only do 1.6ghz on air...slapped a 4' piece of 4" pvc with elbow a foot up from the bottom to house a pump and a 140mm case fan, filled it with antifreeze and pumped it into the block and took the return up to the top into a shower head spraying the heated coolant back into the reservoir, stayed on the edge of freezing 24/7 for over a year uptime in win2kpro at 2.3ghz, at ambient it would press against 3...for like an 80$ piece of silicone, awesome company with awesome products in a deathfight against the titans of microprocessors what's not to love.