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9950X3D 5090 Build: Made Around the Customer's Own GPU and SSDs
Quick answer:
This 9950X3D 5090 build was made around parts the customer already owned: an ASUS ROG Astral RTX 5090 and two Samsung 990 Pro SSDs. We supplied the rest and placed each drive in the M.2 slot he asked for.
Last updated: 27 September 2026
AT A GLANCE
Built for
Custom PC build with customer-supplied components
Key Components
Use own GPU (ROG astral 5090) + Ryzen 9 9950X3D
Case
Phanteks NV7 - White
Price
SGD $6,030
Who this PC is for
For customers with parts to reuse. This build is for customers who already own certain PC components and want a professionally assembled system built around them. The customer supplied an ASUS ROG Astral RTX 5090 and two Samsung 990 Pro SSDs, while Mansa provided the remaining components and followed the customer's installation requirements.
Is a 1200 W power supply enough for a 9950X3D and an RTX 5090?
Yes, with room to spare. NVIDIA lists 575 W of total graphics power for the RTX 5090 and a required system power of 1000 W. This build uses a Seasonic Vertex PX 1200 W 80+ Platinum, which sits above NVIDIA's figure.
Check the cable as well as the wattage. NVIDIA says the card takes either four 8-pin PCIe cables or one 600 W PCIe Gen 5 cable. Because the customer supplied the card, we planned the power supply around it.
Does it matter which M.2 slot each SSD goes in?
On this motherboard, yes. The ASUS ROG Crosshair X870E Hero has five M.2 slots, and some share PCIe bandwidth with the expansion slots. According to ASUS, using M.2_2 reduces the main PCIe graphics slot to x8 and disables the second PCIe slot. Using M.2_3 also reduces the main slot to x8, while the second slot operates at x4. If both M.2_2 and M.2_3 are enabled, the second PCIe slot is disabled.
That's why the customer's installation instructions mattered. The customer specified where each SSD should be installed, and Mansa followed those instructions. The original caption does not identify the exact slot assignments.
Is the 9950X3D worth it over a 9800X3D for gaming?
For games alone, the gap is tiny. In Tom's Hardware's 16-game test at 1080p High and Ultra, the 9800X3D averaged 195.5 FPS and the 9950X3D 194.8 FPS, a 0.4% gap. Tom's Hardware picks the 9800X3D unless you pair gaming with heavy streaming or rendering.
Tom's Hardware describes the 9950X3D as the option for people who want strong multi-threaded performance alongside gaming. This customer paired it with an RTX 5090, and we built what he asked for.
FULL SPECS
Parts List
Motherboard
ASUS ROG Crosshair X870E Hero Wi-Fi 7 & Bluetooth
Processor
Ryzen 9 9950X3D
Cooler
TRYX ARGB Panorama 360mm - Black AIO
Graphics Card
Use own GPU (ROG astral 5090)
Storage
Samsung 9100 Pro 1 TB Gen.5 SSD
Storage
Use own SSD (990 Pro 4 TB - Secondary)
Storage
Use own SSD (990 Pro 1 TB - Third)
Ram
G.Skill RGB Trident Z5 Neo 64 GB DDR5 6000 MHz
Power Supply
Seasonic Vertex PX 1200 W 80+ Platinum
Case
Phanteks NV7 - White
Operating System
Activated Windows 11 Pro 64-Bit
Accessory
Corsair QX120 120mm - 9 RGB Fan
Build Photos
Swipe or use arrows to see more photos.
Full Interior View
A full side view of the completed Phanteks NV7 build, showing the RTX 5090, TRYX Panorama AIO, and nine Corsair RGB fans inside the white chassis.
ROG Astral RTX 5090
A close-up of the customer-supplied ASUS ROG Astral RTX 5090 installed in the system, with the surrounding RGB fans and internal cabling visible.
Trident Z5 Neo Memory
A close-up of the G.Skill Trident Z5 Neo 64GB DDR5 6000MHz memory installed on the ASUS ROG Crosshair X870E Hero motherboard.
TRYX Panorama 360 mm AIO
The TRYX Panorama 360 mm AIO cooler installed over the Ryzen 9 9950X3D, with its display and surrounding RGB lighting visible.
Completed Phanteks NV7 Build
An angled exterior view of the finished white Phanteks NV7 system, highlighting the clean glass-panel design and blue RGB lighting throughout the build.
Price
SGD $6,030
Price as of September 2026. This price excludes the customer-supplied ASUS ROG Astral RTX 5090 and two Samsung 990 Pro SSDs.
Sources: www.nvidia.com · www.tomshardware.com· www.rog.asus.com
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