I found that Koolance kit is OK and
I praise them for their early adoption of Al radiators. However, I found that it was better to use the Koolance blocks for the less intense components (NB, SB, HDD) and haven't used their kits or pumps.
Things you need to check before you go spending any more money:
1: Idle/Load CPU temp with stock cooler (the big Intel QX fan is possibly the best heat sink fan on the market, use that if you have it). How do these compare to your water cooled readings?
2: Is flow restricted by a kink or air pocket? Inspect the hoses and look for anywhere air could gather, CPU 300 can be bad for this.
3: Is your pump faulty? Test it in the sink, how long does it take to pump a gallon or a litre?
4: Reseat you CPU block, remember TIM is there to fill the voids in the CPU and heat sink surfaces, not an extra layer, use as little as possible.
5: Update your
BIOS. This can improve the calibration of the CPU BIOS reading to the actual core temperature as read by OCCT, Real Temp, Core Temp, SpeedFan, MBM etc...
A Water Cooling loop is limited by one of two things, the amount of heat that your radiator can dump into the air and the amount of heat your block(s) can dump into the water. With a double radiator I very much doubt that your system is radiator limited (minimal effect on load temps by increasing airflow). In which case you must be block heat transfer limited. To alleviate this you can either increase water flow (change pump) or improve block heat transfer by changing the block.
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