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HP Recommended

Just to give a quick update. Due an issue with 'missing' thermal pads for my GTX 1080Ti waterblock, it's taken a little longer to complete. Fortunately, replacements were sent and I was able to complete the water cooling mod on my HP Z620;

 

2017-07-22 14.23.04.jpg

 

2017-07-22 14.23.37.jpg

 

2017-07-22 14.28.05.jpg

 

2017-07-23 00.26.08.jpg

 

I will add some benchmark and temperature results later after I've finished playing with the overclock settings on both the CPU and GPU. A quick test in Octanebench with a small increase in the 1080Ti clock and memory speeds has already indicated a positive trend;

 

39.94     K4200

52.20     M2090

91.85     K4200 + M2090

66.31     P2000

186.95   GTX1080Ti

249.26   P2000 + GTX 1080Ti

269.20   P2000 + Water Cooled (and slightly overclocked) GTX 1080Ti

 

Cinebench is showing a CPU single core score of 161 cb.

 

I'll give Prime95 a try later this week but currently indicating a CPU temperature of 33°C at idle and 47°C running the XTU stress test. The GTX temperature is maxing out at 41°C! And that's after 5 hours rendering at 100% load. (Idle temperature is only 28°C max.).

HP Z620 - Liquid Cooled E5-1680v2 @4.7GHz / 64GB Hynix PC3-14900R 1866MHz / GTX1080Ti FE 11GB / Quadro P2000 5GB / Samsung 256GB PCIe M.2 256GB AHCI / Passmark 9.0 Rating = 7147 / CPU 17461 / 2D 1019 / 3D 14464 / Mem 3153 / Disk 15451 / Single Threaded 2551
HP Recommended

@Brian1965 wrote:

Just to give a quick update. Due an issue with 'missing' thermal pads for my GTX 1080Ti waterblock, it's taken a little longer to complete. Fortunately, replacements were sent and I was able to complete the water cooling mod on my HP Z620;

 

 

 

I will add some benchmark and temperature results later after I've finished playing with the overclock settings on both the CPU and GPU. A quick test in Octanebench with a small increase in the 1080Ti clock and memory speeds has already indicated a positive trend;

 

39.94     K4200

52.20     M2090

91.85     K4200 + M2090

66.31     P2000

186.95   GTX1080Ti

249.26   P2000 + GTX 1080Ti

269.20   P2000 + Water Cooled (and slightly overclocked) GTX 1080Ti

 

Cinebench is showing a CPU single core score of 161 cb.

 

I'll give Prime95 a try later this week but currently indicating a CPU temperature of 33°C at idle and 47°C running the XTU stress test. The GTX temperature is maxing out at 41°C! And that's after 5 hours rendering at 100% load. (Idle temperature is only 28°C max.).


Very impressive work and results.

 

Definietely give Prime95 a try on the  'small FFT's (max CPU heat)' settings - 3-4 minutes is entierly sufficent and if it passes without issues then you have yourself a rock stable overclock.

 

Might also be worth compiling a list of CPU's which are overclockable in the Zx20 using XTU. So far we have:

- E5-1650 v2

- E5-1660 v2

- E5-1680 v2

 

The E5-1650 v1 was not overclockable in a 2013 boot block date Z420 (multiplier adjustments grayed out) but has unclocked multiplier and overclocks fine in a X79 board. Maybe other people can post their results also (would be interested in whether the E5-1620 v2 works for instance), but the pattern seems to be that with the Zx20 you really need a 2013 bootblock machine and  a E5-1xxx v2 CPU to have a chance at overclocking .

HP Recommended

Well I've had Prime95 running the max. heat stress test now for the last 2 hours and it's still running in the background now so I'm guessing stability isn't an issue. Here' the current CPU temperature readings;

 

Prime95   25-07-2017.JPG

 

Notice that the CPU frequency is limited to x34 multiplier when running all 8 cores. I believe this is a limitation of the HP Z620 BIOS and cannot be overridden by the OS (or XTU).

 

For that very reason, I find Passmark to be a bit better at maxing out and stressing the CPU, and the rest of the system since it tests single threaded and multi-threaded performance. I normally set the number of runs to 10 and select the short test. I'll initially just run the CPU portion of Passmark, and if that passes, I set the number of runs to 50 and select the long test then run the full Passmark test overnight. If the computer is still running in the morning then no stability issues. Ran it last night and the CPU temperature hit a maximum of 54°C which still looks pretty good to me. (Also, with Prime95 total CPU power = 108W max., with Passmark total CPU power = 120W max. and CPU frequency 3.4 - 4.7GHz tested)

 

I've been runnning completely stable at these settings since Sunday;

 

XTU 25-07-2017.JPG

 

And the latest score is;

 

PM8   24-07-2017.JPG

 

PM8 CPU 24-07-2017.JPG

 

Sorted . . .

 

for now.

 

 

HP Z620 - Liquid Cooled E5-1680v2 @4.7GHz / 64GB Hynix PC3-14900R 1866MHz / GTX1080Ti FE 11GB / Quadro P2000 5GB / Samsung 256GB PCIe M.2 256GB AHCI / Passmark 9.0 Rating = 7147 / CPU 17461 / 2D 1019 / 3D 14464 / Mem 3153 / Disk 15451 / Single Threaded 2551
HP Recommended

@Brian1965 wrote:

 

Notice that the CPU frequency is limited to x34 multiplier when running all 8 cores. I believe this is a limitation of the HP Z620 BIOS and cannot be overridden by the OS (or XTU).

 <cut>

 

XTU 25-07-2017.JPG

 

 

 


You are correct - the bios locks the MSR 0xE2 register at boot, this is why your additional turbo control sliders are grayed out. As you can see, one of the grayed out sliders is 'Turbo Boost Power Max' and is set at the stock 130W. If the register was unlocked you could set this all the way up to 'unlimited'. There is a way to unlock this register, but it involves bios modding which is not as easy on the Zx20 as opposed to other boards.

HP Recommended

I have also added a waterblock for the graphics card to my loop:

 

 

From what i can see, CPU temps at idle have gone up by c.a. 5-6 degrees (I previously had the fan profile on the card set at 20% at idle), but there is not really much of a difference under load. Will have to look for benchmarks which simultenously tax the CPU and GPU.

 

Current Passmark 9.0 scores:

 

 

 

 

 

When performing the passmark tests I had a look at the package power figures - for c.a. 95% pf the time these stay within 130W TDP. In the CPU testing section there were bursts of 15xW but since the CPU test consists of a series of different short tests, with a short pause between each test this is clearly a favourable testing scenario for Zx20 since you practically do not run into the power limit.

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