While I was thinking about it, I made a FYI Futuremark comparison (Link Below) between my highest single-card Chilled Water cooled EVGA GTX 980 Classified Fire Strike Score of 14968 and my highest single-card Chilled Water cooled NVIDIA Titan X Fire Strike Score of 19542 just to show how much more the GM200 GPU performs in my system compared to the GM204 GPU.
 
http://www.3dmark.com/compare/fs/3226035/fs/4429867
 
My results so far running with the same 5960X at 4.8GHz/ASUS RVE/16GB Corsair Memory has shown switching to Phase Change Cooling on the GPU has only resulted in an additional 315 Fire Strike Points, Which to me isn't worth the effort over +10C Chilled Water Cooling, But since I went to all the trouble to install it I might as well leave it on!

Flashed to a Titan X SC 425W Modded Vbios from Overclock.net which raised the Power Target to +121% and a starting GPU clock of 1127MHz, But ran into the same temp problem at anything over 1500MHz on the GPU where the Phase Change couldn't maintain cold enough temps during Fire Strike Graphics Tests, So Flashed back to the stock Titan X Vbios which seems to be the only one that allowed a 1514MHz GPU / 2005MHz Memory OC.
 
Only other Cooling solution I might persuade myself into trying is DICE on the CPU to get higher than 4.8GHz on the 5960X, But as you remember when I attempted that with my ASUS Rampage IV / 4930K at a temp of -62.5C, It resulted in both a CPU and Motherboard Failure that although I managed to get covered under warranty by Intel AND ASUS, Kind of left me with some Doubts about attempting that method any time soon again.
 
Still can't figure out exactly what caused those failures since I couldn't find any condensation damage on the MB. Possibly running the 4930K CPU at 1.6 volts for an extended period of Benching may have resulted in it's premature failure, Which all adds up to why I've been taking different ventures with cooling experimentation a little slower using just a single card.

  

I won't be testing on a Titan X, but phase change and other parts are standing by, waiting for my stuff to arrive.

Here's an interesting thought that I had not considered lately...........
 
Since I'm already near limits with my System (ASUS RVE/5960X at 4.8GHz/16GB Corsair at 2800MHz/NVIDIA Titan X at 1514MHz - 2005MHz Memory), I'm beginning to wonder how well Gran Theft Auto V would work (FPS) if I install it on my Benching Rig?
 

 
Maybe I can Find a way to "Download" a copy for Testing.
 
 
 

I have a question about Phase Change.  Three Questions actually.  
 
Scrap heap (in my sig) is under Phase Change right now. The head of the cooling plate is reporting -45c on the Fluke and -43 on the phase change itself.  The CPU isn't showing lower than -18 ever though.  Is that normal?  I don't want to start pushing until I am sure my temps are really good and ready to start. I only tested that for about a hour so far.
 
I also tightly packed around the socket, and then over the CPU, but I did not use DiElectric grease in the socket.  Should I use the grease since I will be using this as a daily driver once I get the system full up and running?  I have read that at the temperatures this is capable of, it may not be necessary.. I would rather take the safest option for long term exposure possible.

Scarlet-Tech
I have a question about Phase Change.  Three Questions actually.  
 
Scrap heap (in my sig) is under Phase Change right now. The head of the cooling plate is reporting -45c on the Fluke and -43 on the phase change itself.  The CPU isn't showing lower than -18 ever though.  Is that normal?  I don't want to start pushing until I am sure my temps are really good and ready to start. I only tested that for about a hour so far.
 
I also tightly packed around the socket, and then over the CPU, but I did not use DiElectric grease in the socket.  Should I use the grease since I will be using this as a daily driver once I get the system full up and running?  I have read that at the temperatures this is capable of, it may not be necessary.. I would rather take the safest option for long term exposure possible.

This is a Normal Temperature Swing condition for most Single Stage Phase Change setups.
 
On My 5960X running at 4.8GHz, My Phase Change shows -40C at the top of the evaporator head, But on my ASUS RVE OC panel, it is showing -9C to -12C while under Load during the First two of the Graphics Tests on Fire Strike Bench, But during the Physics and Combined Tests the CPU temps can rise as high as +22C due to the 300W Phase Change Load limit on my Single Stage Unit not being able to handle the additional Load of the CPU when Pushing extremely hard during those Bench Tests.
 
As far as Dielectric grease or even Petroleum Jelly in the CPU Socket, I would advise either one should be used IF you are going to operate your System for extended periods or 24/7.
 
In All my previous Phase Change Benching Rigs, I have used Petroleum Jelly in the CPU Socket that has been heated until it is melting using a Hair Dryer before then Installing the CPU in which the underside has also been lightly coated before it is locked into place followed by heating the CPU itself to ensure good electrical contact/moisture seal between the CPU and the Socket "fingers" before I will install the Phase Change Evaporator Head assembly.
 
It is Still up to the individual on whether or not to use any form of CPU/Socket Protection, But Judging from My Experience, This Method has NEVER caused any damage to any CPU/MB on any Benching Rig using Phase Change Cooling I have built since 2008.   
 
 

I will be pulling the cpu soon anyway, as I am considering a delid. Not sure if liquid pro has an appropriate thermal range for subzero. When I pull it, I will go ahead and warm up the dielectric grease since I have verified it works well. I guess I should ask if I should fill the socket or just lightly cost everything?

My temp of -18 was at idle, so I felt like it may have been high and just wanted to check.
 
Just found the answer to the thermal range for liquid pro.  -273c to 1200c. I think it will be fine, lol. 

Scarlet-Tech
I will be pulling the cpu soon anyway, as I am considering a delid. Not sure if liquid pro has an appropriate thermal range for subzero. When I pull it, I will go ahead and warm up the dielectric grease since I have verified it works well. I guess I should ask if I should fill the socket or just lightly cost everything?

My temp of -18 was at idle, so I felt like it may have been high and just wanted to check.
 
Just found the answer to the thermal range for liquid pro.  -273c to 1200c. I think it will be fine, lol. 

I would be very careful that in the event you decide to use dielectric grease in the socket that you do not damage the "fingers" when applying it.
This is the main reason I have always used the previously mentioned method of melting Petroleum Jelly into the CPU Socket to prevent any damage, But Like I stated in my last post, Use whatever method is comfortable for yourself that works. 

Gotcha. I will be melting it, no just shoving it in. From everything I have seen, it is treated the same as petroleum jelly. I haven't used either yet, so I will test this before hand. I am guessing just get enough in there to cost everything. All of the "guides" I have tried to reference lead to dead links, lol.

Testing it before I put it in the socket, it doesn't seem that it likes the idea of melting, lol. I will grab some petroleum jelly tomorrow.

hallowen

I would be very careful that in the event you decide to use dielectric grease in the socket that you do not damage the "fingers" when applying it.
This is the main reason I have always used the previously mentioned method of melting Petroleum Jelly into the CPU Socket to prevent any damage, But Like I stated in my last post, Use whatever method is comfortable for yourself that works. 

Delidded last night. Went through the procedure of removing all of the scrap epoxy, applied CLP, fingernail polish to the caps and fresh epoxy to to the ihs. Placed it in a spare board last night and clamped it to sit and cure.

Came home today, after grabbing Petroleum jelly, filled the socket and prepped the cpu, and installed it.

Boot into the bios, and I am at -21c now. That is only 3c difference, but I figure that every single c counts, so why not. Everything booted fine and I actually overflowed the socket a tiny bit by accident, but I figure that it's OK compared to not enough.

Ready to make this old girl my daily driver.