I don't use any special effect.  If I just revserse speed of video

That actually would be considered an effect.

Post the specifics of your media and sequence settings.

OK.

Are you shooting 30p or the normal 30i?

There is no sense in getting two Titan cards in SLI, simply because SLI configurations are not supported and give serious problems. Not to mention it would likely require a new PSU.

With regard to your Passmark results, they are certainly good, but not spectacular. Look at (click on the image)

and notice that my system has a GTX 680 / 4G card that easily runs way faster in this benchmark test than your Quadro 6000 and is only a fraction of the cost. Your Passmark results may indicate that some tuning on your system might be needed. How many processes are running on your system when you use PR?

Your scores are significantly lower than mine by respectively 33% - 9% - 36% - 68% - 33% and 63% which tells me you can optimize your system a bit.

For more testing results of my system, look at Final Results - Reflections

Also take a look at Practical System Requirements which tells a different story than Adobe, for the simple reason it was not made by Marketing. Quadro cards have always been pushed by Adobe Marketing, but are in fact overpriced and underperforming.

There is a whole site behind this link: Final Results - Reflections that may contain answers to your questions. Take some time to look around the other pages as well. It is required that you register and login to the site to access for instance the Detailed Results page.

But the fact, I don't want to create ramdrive and bench virtual setup just to get better score

Neither have I, as documented on the page I linked to.

Why Adobe is pushing Quadro so much, there has to be a commercial reason for that I think. Marketing people have a natural tendency to leave out facts and only proclaim 'the ultimate dream' that is often far from the truth. There is ONE, and only ONE situation where you want a Quadro card over a GTX card and that is when you NEED 10 bit output to expensive 10-bit monitor(s).

BTW, the Quadro 6000 has 448 cores, the GTX 680 has 1536 cores, the 6000 has a memory bus of 384 bits versus 256 for the 680, the memory bandwidth is 144 versus 192.2 GB/s and most importantly the 6000 is a much older architecture.

It is also documented on the site, but essentially it is 3 x 7 disk raid3, striped to raid30 plus 3 global hot-spares of Seagate Constellation ES 1 TB disks, making a total of 24 disks and a net capacity of 18 TB.

HDTunePro, CrystalDisk and AJA benchmarks are included on the page I linked to. Just scroll down a bit.

Bill and I are still struggling with PPBM6, so it is not yet available. I have received your PPBM5 results and added them. Rank #22 among the CS6 results, solid Q3 results with a very good H.264 score, due to the 8 core CPU. The MPE results are comparable to a GTX 570, which makes sense since the specs are very close to the Quadro 6000, apart from the amount of VRAM of course, but the amount does not impact performance in this test.