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Originally Posted by Ewout_vB
But if i use silver solder and still have all of the copper tubes touching it might decrease a little but it shouldnt be that much would it?
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If you used pure silver to do your soldering, maybe it would work.
But, check your solder. The soft, silver-bearing solders are generally 95% tin/5% silver have a thermal conductivity under 50 W/mK (compared to copper's 390, silver's 420). Even the harder/higher percentage silver solders are poor - I've seen a 95% silver solder at 94 W/mK.
Pure element metals will have a nice regular crystal lattice which conducts heat well. When you introduce another element, even a small percentage, you'll mess up that structure. Exampe: Copper - 390 W/mK, Silicon 150 W/mK, Silicon Bronze (97/3 Cu/Si) 36 W/mK. In general, alloys suck at heat conduction.
If you want the block to look cool, solder those tubes. But, if you want the CPU to be cool....:shrug: