Click here for new test results which now include Phobya Liquid Metal
I've been unable to find a comparison between these two compounds so I thought I'd compare them myself. I've had it confirmed by the CEO of Coollaboratory that Liquid Ultra is rated at 38.4w/mk and Liquid Pro is rated at 32.6w/mk.SystemCPU:
Intel 3770K @ 4.7GHz 1.224v (de-lidded)Mainboard:
ASUS Maximus V FormulaCooler:
Corsair H100 (2x Corsair SP120/2x Scyte Ultra Kaze 3000)Memory:
2x4GB Crucial Ballistix Tracer @ 2000MHzSSD:
Crucial M4 128GBGraphics:
Corsair 800DOperating System:
Windows 8 Pro x64
The case is very well cooled. There are a total of 9 case fans all intake. The H100 exhausts out the top.
I have a temp sensor measuring the room temperature. Attached to it is a sensor which is inside the case, next to the mainboard. There are 4 more temperature sensors attached to the fan controller at various points inside the case. The case temperature was recorded at the start, after 15 minutes, after 30 minutes, after 45 minutes and at the end of the testing. The average was then used.
I used the latest version of Aida64 running "Stress FPU" for 1 hour. FPU stressing means AIDA64 System Stability Test will use a floating-point calculation task that stresses the FPU part of your processor. Modern processors all have an integrated FPU, and from all the components that are integrated, the FPU is the most complex one. Hence stressing only the FPU actually stresses most of your processor, and usually drives the processor to its maximum temperature. The average core temperature is recorded by Aida64.
The compound was painted on the die, on both sides of the IHS and on the base of the H100. Each compound was applied, tested then re-applied and tested again. The best results were posted.
<<b>update> I noticed no difference in temps when I applied the liquid metal to the underside of the IHS and when I didn't. The amount used however can have a dramatic effect on temps. Despite what others may say, I found that applying too much or too little caused a noticeable increase in temps. It's worth applying it multiple times if you believe your temps could/should be better. As you can see from these results
using Liquid Ultra, the hottest core was only 53c with an average temp of 49c. I have so far been able to achieve the same results so I'm waiting for more to arrive so I can keep trying.Liquid UltraLiquid ProLiquid Ultra has a delta temp of 3.1c lower than Liquid Pro in my system3770K @ 5GHz 1.416vLiquid ProLiquid Ultra
This time Liquid Pro was 1.71c cooler than Ultra.
If we use a +/- 2c margin of error there is nothing separating these two compounds. Liquid Ultra is better to work with. I wouldn't use the cotton tips that are supplied with Liquid Pro because I found more compound stayed on the cotton than on the IHS. Also there is the risk of cotton fibers sticking to the die or IHS which would impact temps. I used the brush that is supplied with Liquid Ultra which makes the application very easy.
Cleaning is another issue. Liquid Ultra simply wipes off but Liquid Pro often forms tiny balls which when accidentally smeared leaves quite a big mess. I had the stuff all over my fingers by the time I finished wiping it off.
If you are using one or the other than stick with it. There is nothing to gain by switching.