X48 BlackOps Heatsink/Waterblock/Extreme Cooling Compatibility List

[InToGraphics]

OCZ Vendetta 2, impressed by its performance. But clearance from the stock NB-fan is bad. (See the pictures.)
The problem with the Vendetta 2 and the NB-HSF is that the Vendetta covers both holes in the long side of the NB heathsink. I need one of them to screw on the NB heathsink fan.
I tried a Spire 40x40x20 mm fan SP04020S1H3 instead of the stock NB-fan, but the performance was far worse. About 8°C more at idle even though it covered a lot more of the NB-tub.

In August 2008 I started building my new box (see signature) with 4GB. (I moved the graphics card from the blue PCI-e slot to the red PCI-e slot.)
Despite the less than stellar positioning of the stock NB-fan, I eventually managed a stable overclock : EDIT2: FSB@440Mhz, CPU@3740Mhz (x8.5), and 4GB RAM@1760Mhz (x4).
(Well actually it seems stable to me with IntelBurnTest/Linpack, but I'm a noob. First proper attempt at a serious overclock.)

One of the last days of January 2009, I added another 4GB of the same memory. I'm having major trouble ever since getting things stable. EDIT1: With RAM at 1600Mhz, 1700Mhz, or 1780Mhz
I wanted to cool the NB better. So I turned the Vendetta 2 by 90°, but that hurt it's performance. About 5°C higher at idle. I tried this twice, thinking I didn't apply the cooling paste correctly. It also covered some of the memory slots now.
So first I want to replace the CPU cooler with another one which brings me better clearance so that I can properly fit the NB-fan.
Performance and noise level will have to be at least the same or better as the OCZ Vendetta 2.
I'm looking into getting either the Cooler Master V8 or Hyper Z600. But I want to know whether they provide enough clearance from the NB+HSF.

Can anyone confirm or deny this ?