OCZ HydroFlow compared to a couple of other blocks on an OC'd E6400 (you may need to scroll): http://www.xtremesystems.org/forums/showthread.php?214668-Cheap-high-flow-water-blocks&p=3585041
HydroFlow is +1 deg to an old EK Supreme, or +3 deg to an old HeatKiller 3.0 LC block. http://skinneelabs.com/ek-supreme-hf-review/4/
This review shows a big comparison graph listing the performance of various blocks.
-The EK Supreme bottoms out at ~67.1 deg while the Supreme HF bottoms out at 64.3, a 3 degree difference.
-The HK 3.0 LC bottoms out at 66.8, a 2 degree to the Supreme HF.
- For comparison to the next graph, the Apogee XT bottomed out at 65 degrees, for a difference of ~2 degrees to the Supreme.
- The Apogee XT is ~1.5 degrees higher than the Raystorm.
The OCZ HydroFlow cools roughly 4.5 degrees (follow the Supreme to Apogee XT to Raystorm) worse than the Raystorm comparatively speaking. And yes, I know I abused maths to get this answer.
Considering that the top performance blocks all cool to within degree or so of each other, this is a substatial improvement.
tl;dr - your block doesnt look like its up to cooling your CPU and its time to get a new one. The Raystorm linked above is a good block without the expensive price tag of the top dogs and cools to about the same.
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