"Maximum Render Quality" Better to turn it OFF when using CUDA MPE?

http://crookedpathfilms.com/blog/201...port-settings/

"IMPORTANT NOTE ABOUT RENDERING TIME:  Make sure you do not select “Use  Maximum Render Quality” if you are utilizing the accelerated GPU  graphics (Mercury Playback Engine).  This will not improve your video  and will only slow down the rendering speed by as much as 4 times!"

http://blogs.adobe.com/premiereprotr...e-pro-cs5.html

"For export, scaling with CUDA is always at maximum quality, regardless  of quality settings. (This only applies to scaling done on the GPU.)  Maximum Render Quality can still make a difference with CUDA-accelerated  exports for any parts of the render that are processed on the CPU...

When rendering is done on the CPU with Maximum Render Quality enabled,  processing is done in a linear color space (i.e., gamma = 1.0) at 32  bits per channel (bpc), which results in more realistic results, finer  gradations in color, and better results for midtones. CUDA-accelerated  processing is always performed in a 32-bpc linear color space. To have  results match between CPU rendering and GPU rendering, enable Maximum  Render Quality."

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Here is what I got out of after reading those two sites:

I should turn it off for it's always ON (when CUDA MPE is used)  regardless I check or uncheck it.Turning it ON only offloads the  calculation to CPU (instead of GPU) hence slowing down the previewing  and encoding performance.
So I guess I should have Maximum Render Quality setting turned OFF in both of squence settings and export settings.
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However, David Knarr of Studio 1 Productions suggest otherwise:

http://www.studio1productions.com/Articles/PremiereCS5.htm

"When you startup Adobe Premiere CS5 and you don't have a certified video card  (or one that is unlocked) the Mercury Playback Engine is in software rendering mode  and by default the Maximum Render Quality mode (or MRQ) is to OFF.

(Maximum Render Quality mode will maximize the quality of motion in rendered clips and  sequences.  So when you select this option, the video will often  render moving objects more sharply.  Maximum Render Quality also maintains sharp  detail when scaling from large formats to smaller formats, or from  high-definition to standard-definition formats.  For the highest quality exports you should always use the Maximum Render Quality  mode.)

When you unlock Adobe Premiere CS5 so the Mercury Playback Engine can use almost  any newer NVidia card (or if you are using a "certified" NVidia graphics card),  the Mercury Playback Engine will be in the hardware  rendering mode and the Maximum Render Quality mode  will be turned ON.

Since the software mode is not set to maximum render quality,  it can sometime render faster than the hardware render, but a a loss in  qualitly. If you set the software to  maximum render quality you will see that it is very, very slow compared to the  hardware render.

Here is how to set the Maximum Render Quality.
1)  Open up Premiere CS5
2)  Click on Sequence at the top of the screen
3)  Then select Sequence Settings
4)  At the bottom of the window select Maximum Render Quality and click Okay

It is always best to be using the Maximum Render Quality mode,"

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Now, I'm lost.