Lapped by Ultra-120 Extreme (pics and results)

[Mac Daddy]

Originally Posted by Max_87

There is a reason why Thermalright started making their heatsink bases convex, all of them used to be flat. The main purpose is to concentrate all the mounting pressure on the center of the IHS, at the cost of consistency in mountings; you need to attempt a few mounts to get the most optimal temperature, it's all about trial and error. Does it do better than a flat base? Yes, definitely. It's been tested and proven many times in XS My WB Testing Results, Excel file inside. - XtremeSystems Forums

Swiftech is the first to ship their waterblocks with convex base (Apogee GT/GTX), after that I started seeing Thermalright doing the same thing on their TRUE. EK also does the same thing on their latest EK Supreme CPU waterblock. When Thermalright started shipping their TRUE with convex base, many went "OMGWTF has gone wrong with their QC!" and started lapping their heatsinks

No seriously, don't lap these convex bases unless you are using a processor without IHS.

Some reading on "bowing" aka convex base
The anatomy of a 'bow'. - XtremeSystems Forums
CPU block lapping - XtremeSystems Forums

Makes sense and thanks for the info. Even though I am getting around 44C under load on the cores of my E6550 with the Hyper212 I still think there are "hot spots" on the die and this may be why. Same with the Katana2 on the Celeron. May try it first with the Katana2 as that isn't my main machine and it can be down for a few days.

[Max_87]

Your katana2 doesn't have a convex base. Thermalright is the only one to do this on heatsinks.

[Mac Daddy]

Originally Posted by Max_87

Your katana2 doesn't have a convex base. Thermalright is the only one to do this on heatsinks.

Ahh I see ok well might have one to try sooner or later

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Good job, I just lapped the liquid cooling block on my CPU and GPU, I might be going flourinert soon so it might be wasted effort but oh well.