9950X3D/4090 Watercooled Build

ddrueding

Fixture
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Parts arrived today, so I started the build. So far I'm about 6 hours into assembly.

AMD 9950X3D, delidded by Thermal Grizzly with a 2 year warranty
Thermal Grizzly Direct Die Waterblock
ASRock X870E Taichi Lite
96GB Corsair Vengeance DDR5 6000
1TB Crucial T705 Gen5 SSD
MSI 4090 Suprim with Alphacool Waterblock
Seasonic Prime 1200 PSU
Silverstone RM52 6U Rackmount chassis
2x Alphacool 360 Radiators
2x Alphacool 120 Reservoirs
2x Alphacool D5 clone pumps
7x Noctua NF-A12x25 PWM Fans
Dynamat

It has been a while since I've done an over-the-top build, and I couldn't help myself. The plan is for separate water cooling loops for the CPU and GPU, allowing them to settle at different temps, and make future changes easier. This is probably 3x the cost of a system that would perform within 5%, but it should be very quiet and satisfying. Not going for looks, just performance and cool factor (in my eyes at least).

I picked this case for the front IO and that I could fit the radiators in it. The rest of the features I stripped out as they aren't needed for the build.

Getting vibration treatment on the chassis first was important, as this chassis is just steel and vibrated all over. I added it in chunks to work around the protrusions on the panels until tapping or banging it anywhere just made a "thud". This did involve sticking some panels together, but they aren't ones needed for service.

Unfortunately, Alphacool seems to have forgotten one of the plugs on each of the reservoirs. I've put in a service ticket and hope to have them in soon. In the meantime I may use the parts I have to make the CPU loop work and run the GPU aircooled. Currently pressure testing the CPU loop overnight.
 

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ddrueding

Fixture
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Got the build far enough along that I was able to flash the BIOS to the latest and power it on. The POST codes on the motherboard never leave "00", so either the board or chip is bad. There have been rumours of ASRock having issues with AM5, so I've ordered an ASUS PRIME X870-P that should be here tomorrow so I can continue.
 

Chewy509

Wotty wot wot.
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Gold Coast Hinterland, Australia
How long did you wait for the POST screen?
IIRC AM5 processors can take a long time to post the first time due to memory training especially when dealing with large memory modules. (10-15 minutes having been reported on reddit with some higher end boards like the Taichi).
 

ddrueding

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Just in case I gave it another 20 minute shot right now. Even 96GB should be faster than that, and the code of 00 on the motherboard implies that it didn't even get to the memory yet.

Replacement board should arrive today.
 

Mercutio

Fatwah on Western Digital
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The more RAM you have and the higher it's clocked, the longer it takes. It EASILY took a half hour before 96GB of DDR5-6400 posted on my system.
Also I wound up running my EXPO RAM at DDR5-6000 anyway because I was seeing a bluescreen every few weeks and clocking the RAM down seemed to fix it.
 

ddrueding

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The ASUS board posted immediately and took me to BIOS within 5 minutes. I set to EXPOII (DDR5-6000 and tighter timings), and will start stability testing the RAM soon.
 

ddrueding

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Only the CPU water cooling loop is currently running, and I have an old 2080Ti with a broken fan just to give video out.

Factory Clock:
Ambient is 27C
Idle is 32C
Cinebench 2024 CPU Multi-Core (full load) is 56C at 5.2Ghz giving a score of 2340.

Compared to a friend who has a non-delidded 9950X3D and a 360 AiO my full load temp is 15C cooler.

Overclocking may have to wait until I get back from a road trip to Italy.
 

Mercutio

Fatwah on Western Digital
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Every AM5 other than the 7500F has at least enough iGPU to give video out, so no reason to involve an iffy discrete card if you don't want to.
 
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