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Originally Posted by pHaestus
Bill and Cathar:
Have you played around with watching die temperatures rise/fall upon turning pumps on and off? It's remarkable how quickly that the thin bp waterblocks respond.
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Yes, I've tried this. Thin BP blocks don't offer much in the way of thermal buffering, however, they still offer plenty of time (many minutes) for any thermal protection circuitry to kick in.
Bill is right in that under certain circumstances that a thicker bp will offer higher overclocks than a thinner bp, but I find that this is also quite closely linked to the flow rate and the design. I regularly test from 1LPM - 10LPM, and have yet to observe a thicker bp block offering a higher overclock than a finely structured thin-bp block in that flow-rate range at anything over 2LPM. For unstructured thin-bp blocks, definitely, that's the case. By "unstructured" I mean basically largish expanses of flat plate convective area.
This is one of the things I'm playing with for the XXX, that being an increase of the bp vs "cup base expanse" ratio, and balancing that off against the thermal resistance of the material in an attempt to more evenly "smooth" out any temperature spikes.
With most things for this waterblock gig, there are many ways to approach the problem, and it is apparant that there is a great deal more going on than just a bulk C/W value when it comes to overclock stability.