PHVM_BR

Not necessarily. Phase change pads better fill heat sink contact gaps.

Don't waste your time with Carbonaut because Kryosheet is much better. Your temperatures are fine, I wouldn't change anything if your CPU reaches max performance at 85°C at full load. On my Precision, Kryosheet provides up to ~15% more thermal headroom than the PTM 7950, but, as I mentioned earlier, it requires good contact between the heatsink and the CPU. I've tested Kryosheet on another laptop and didn't get good results due to uneven heatsink contact. You'll need to test it to find out. I like to drip a micro drop of thermal paste in 2 diagonals close to the CPU die so that the graphene sheet remains fixed. I forgot to mention, but I only use Kryosheet on the CPU. On the GPU, the phase change pad works great and is more than sufficient. Your CPU must be undervolted to achieve its full performance on this machine. On my old i7-9750H in Cinebench R23 to sustain 4.0GHz on all cores (maximum clock at full load): . without undervolt: ~100W at ~95°C and fans at 100% . with undervolt: ~60W at ~78°C and fans at ~75%

I tested almost everything available on the 7540's i9, including Gelid HeatPhase. In my tests, its performance falls short of the PTM 7950 or TG PhaseSheet, which are identical. The Gelid phase-change pad appears to be of lower quality, at least when I tested it. In any case, with an undervolt, your 7530 with Gelid HeatPhase should be able to deliver the full performance of the i7-8750H without difficulty. Before the i9-9980HK, my Precision originally came with an i7-9750H (very similar to the 8750H), and with a fully stable undervolt, it consumed a maximum of 60-61W to deliver its peak performance in Cinebench R23 (4.0GHz on all cores), and the temperature hovered around 80°C with the fans at ~75%. On my i9, Kryosheet can provide more thermal headroom than the PTM 7950, but this requires good heatsink contact. Otherwise, the phase change pad will be better... Always keep the air intake away from the tabletop with a laptop stand. It makes a big difference on these Precision laptops.

4.6GHz in one benchmark may be different from 4.6GHz in another. It depends on the intensity of the load. For example, sustaining 4.6GHz may require 100W in one benchmark and 150W in another. The more watts, the more heat. Try Cinebench R23 or 2024. The load is heavier. As for UserBenchmark, no one cares, so you won't have a basis for comparison.

Try another benchmark, nobody cares about userbenchmark. It's crap!

I'm using Kryosheet on the CPU and PTM 7950 on the GPU. I also tested PTM 7950 on the CPU, but its performance is lower compared to Kryosheet. The problem with Kryosheet is that the heatsink needs to make a perfect contact with the die, uniform, otherwise the performance will be equal or worse than PTM 7950. I have 2 heatsinks for the P7540, the original one for Quadro T2000 and the one I bought for RTX 4000. I can only get these 160W with the original heatsink because unfortunately with the new, 2 cores reach the thermal limit at ~130W in the short CBR23 test. About undervolt, my i9 is totally stable with -102mV for the cache and -170mV for the core. This is for Windows in Balanced mode, with Speedshift at 84, where the clocks vary constantly... In High Performance mode (Speedshift = 0), the stable undervolt varies according to the set clock and to use a more aggressive undervolt I need to set the same clock for all loads on all cores. On my i9, for 4.2 and 4.3GHz the stable undervolt is the one mentioned above, but above that I can extract more: 4.4GHz -120mV / -200mV 4.5GHz -140mV / -230mV 4.6GHz -150mV / -250mV 4.7GHz -135mV / -225mV One tip is that with the default IccMax (140A) the maximum power the CPU can use is ~120W, which on the CBR23 with undervolt is equivalent to ~4.4GHz on all cores. Above that, it is necessary to increase the IccMax of the core and cache. For normal use, I keep it at default, for intensive tasks with overclocking or for benchmarks I increase both to the maximum.

Horrible! They ended up with strong names, consolidated, with the excuse of making it easier to identify the lines and put something totally generic.

https://videocardz.com/newz/alienware-brings-back-area-51-laptops-core-ultra-200hx-and-geforce-rtx-50-on-board

The 7670/7680 already have a TGP +100W. For the claimed 170W of CPU + GPU consumption I would bet on 55W + 115W with around 130/140W with Dynamic Boost.

https://www.notebookcheck.com/Dell-Pro-Max-16-und-Pro-Max-18-Plus-leaken-als-Flaggschiff-Laptops-mit-Tandem-OLED-und-drei-Lueftern.930490.0.html

WTF! I never imagined that the Precision 7540 could do Cinebench R23 at 4.6GHz all core consuming +150W and without thermal throttling! In Cinebench 2024 which is a longer benchmark (~8 minutes vs ~1 minute in R23) I can sustain 4.5GHz consuming +130W reaching a maximum of ~92°C. Edit: At 4,7GHz all cores consuming 157W:

In Cinebench reducing it to -210mV you should see the clock increase with the temperature remaining the same as it will continue to consume 60W. Generally with Speedshift at 0 with high performance selected in the Throttlestop main window it is possible to increase the undervoltage. This occurs because the voltage x clock curve varies and generally at higher clocks it is possible to reduce the voltage a little more. With Speedshift at 0, the processor will always try to keep clocks at maximum, thus allowing greater undervoltage. Try setting High Performance in Throttlestop with -135mV in cache and -225mV in core. This will allow reaching higher clocks in Cinebench, probably close to the maximum clock possible on all CPU cores (4.1GHz) but probably still limited by the PL1 of 60W. The only way I know of getting around the EC power limit is by changing the IMON slope/IMON offset, but on the Precision 7540 I found that forcing the CPU for about 2 minutes at 92°C or more causes the power limit decrease even when changing IMON slope.

Try lowering it to -210mV in core while keeping the -126mV in cache. This should allow the CPU to increase clock speed during Cinebench. It makes a big difference to move the air intake away from the table top. A simple laptop stand solves the problem. The Precisions have the power limits locked in the EC, so if selecting Ultra Performance in the power manager does not increase PL1 you are limited to 60W. On the Precision 7540 this limit is 75W. You can try to increase PL1 and check Lock MMIO to confirm. Your Speedshift is at 84 which is not ideal for pure processor performance. If it's Windows 11, select performance mode and Speedshift goes to 63 and this makes a small difference. I personally don't use High Performance mode (Speedshift 0) by checking the option in the main Throttlestop window.

If the clock is at 3.7GHz at full load at 90°C, your problem is not thermal limitation but power limit. In Dell Power Manager are there different performance profiles? On the Precision 7540 there is the Ultra Performance option that increases the power limit and fan rotation, making it possible to achieve more performance. Post a screenshot of the Throttlestop FIVR window here. With the undervolt you mentioned you should be reaching the maximum performance of this Xeon. With PTM 7950 you will get another level in the performance / temperature ratio. I have a Precision that had an i7-9750H, similar to the Xeon in your laptop, and with PTM 7950 I could run Cinebench R23 at maximum performance (4.0GHz on all cores) without undervolt consuming ~100W at ~95°C with the fans at maximum. With -125mV in the cache and -210mV in the core, consumption decreased to ~60W under the same conditions and the temperature was ~78°C with the fans at 75%. You will not need to change the thermal pads because if you buy an RTX 3000 you will need a new heatsink assembly and the thermal pads are already applied. In my experience these machines do not require replacement thermal pads to obtain maximum hardware performance.

If I'm not mistaken, this Xeon can go up to 4.1GHz on all cores at full load. Limited to 3.7GHz at full load it is certainly suffering from throttling due to insufficient power limit or thermal throttling. If your undervolt is actually applied it is probably limited to 3.7GHz due to the thermal limit. With a good thermal compound and undervolt you will get the full performance of this CPU easily.