Precision 7550 & 7750 Owners' Thread

Kryonaut really, really allows this mobile CPU to stretch its legs. The thinner the layer, the better. I had it so thin that there are parts of the CPU that are slightly exposed. This has given me fantastic performance. Time will tell if the paste will last.

Figured that the less paste there was, the better thermal conductivity. Can't beat copper.

Ambient temp: 24C

128W+ for 7 seconds
120W+ for 20 seconds
115W+ for 28 seconds (PL2 time limit)
75W for ∞ seconds (PL1 power limit)

 

Does it pump out after an extended period of time?

 

That remains to be seen. I can't tell unless I pause the CB20 test and give it a minute to cool since right now it has no trouble maintaining PL1 75W limit at 86-87C. The 120W+ boosts are really nice, though. I'm gauging by max package power peak during CB20 to see just how much heat the paste can transfer and for how long.

All pastes will pump out. Just how severe, I don't know. Application of the paste matters a lot more than what specific paste is used.

I did spread it as thin as possible, since I believe that the heatsink makes decent contact. I also press down on the heatsink assembly once the screws have been tightened to thin the gap even more.

 

Its a formulated liquid metal. The foil is the right thickness and is cut to the die size. You sandwich it in and let the CPU or GPU get hotter than it will normally run. The foil melts to fill all the gaps and then acts sort of in between liquid metal and a good conductive paste. So goes the marketing. If the burn in and angle between the die and cooler aren't perfect then it air gaps and is junky. I had OK luck, seems somewhat better than a good paste but probably not as good as true liquid metal. Mostly, I use either one of the Gelids or IC Diamond. I suppose I should up my game...

Homer

 

Averages after a full day. Matlab + Solidworks + 100 browser tabs + OBS streaming. I have the 7550 docked as a desktop but the power draw still surprises me. That's 1-2KWh a day.


No degradation in the paste. I believe my earlier panic about the temps spiking was misplaced since I forgot that the dGPU was drawing 25W more due to a multi-monitor setup that I had implemented. Since the heatsink is shared, it makes sense that the CPU was only able to draw 100W instead of the 125W from before. This isn't a failure of the paste whatsoever, but rather a limitation of the heatsink. Still great, though.

I switched to a single display only and can confirm that I can draw 125W again.

I don't know if they'd have been able to fit in a larger heatsink given the size of the chassis. The space is utilized very well, dare I say, to nearly MBP levels.

 

I've found these two pictures at this link: https://forum.51nb.com/thread-1954923-1-1.html

7550--->Quadro RTX 5000 ----- KTVG5 ----- CRD,GRPHC,NV,N19E-Q5,DGFF2



7750----->Quadro RTX 5000 ----- 0GF2K ----- CRD,GRPHC,NV,N19E-Q5,DGFF3


It looks the dgff3 is a bit longer than dgff2 and the screw holes slightly different (at least the one i notice on the bottom left: on the 7750 is under the "r22" inductor whereas on the 7550 is aligned with the mosfets).

At least we can say that the mysterious dgff leaked at 51nbforum (see this post for further info: http://forum.notebookreview.com/thr...750-owners-thread.833097/page-2#post-11019721) was a RTX 4000 (new) DGFF3 meant to be used on future 7750.

 

Looks like larger VRMs ("R22" things) on the larger 7750 version of the card. Possible that the 7550 Quadro RTX 5000 wouldn't be able to run with a much higher power limit even if you swapped the vBIOS because of physical limitations? Funny, though, even though the 7750 version is larger, it doesn't look like they're using that extra space for much.

I was wondering about this and suspected we would see DGFF3 cards longer in one dimension. It looks like this time they made sure that the cards are oriented the same so you can fit smaller DGFF2 cards into the 7750. Maybe not though. It looks like the bottom left screw position is the same (compare it to the DGFF connector positions) but the top left one is different (compare horizontal position against the bottom left one).

Anyway. Hoping that they stick with this form factor for more than two generations.

 

Me too, but that's unlikely. Not after what they did to the Alienware Area-51m owners.

 

Ordered a Rain Design mStand. It's very heavy and rock solid. I got the space gray version which is a bit darker than the Titan Gray color of the Precision – I think it blends in rather well

Bonus is that because the whole thing is extruded out of aluminium, the stand acts as a giant heatsink. Fans shut off significantly more quickly now and surface temps are lower.

 

SlurpJug

Thanks so much for your great content.

I like the Rain Design mStand, but it sort of looks like it might block the intakes for the fans. I'm guessing from your positive post that's not a problem, but could you comment / explain? THanks so much.